AU2014259546A1 - Integrated sample preparation systems and stabilized enzyme mixtures - Google Patents

Abstract

Provided are integrated sample preparation systems and stabilized enzyme mixtures. In particular, micro fluidic cards configured for processing a sample and generating DNA libraries that are suitable for use in sequencing methods (e.g., next generation sequencing methods) or other suitable nucleic acid analysis methods are provided. Also provided are stabilized enzyme mixtures containing an enzyme (e.g., an enzyme used in whole genome amplification), BSA, and a sugar. Such enzyme mixtures may be lyophilized and stored at room temperature without significant loss of enzyme activity for months.

Description

WO 2011/140489 PCT/US2011/035597 INTEGRATED SAMPLE PREPARATION SYSTEMS AND STABILIZED ENZYME MIXTURES The present application claims priority to U.S. Patent Application No. 13/102,520 5 filed May 6, 2011 (filed concurrently herewith) and U.S. Provisional application 61/33 1,910, filed May 6, 2010, the entirety of each of which is herein incorporated by reference in its entirety. STATEMENT OF GOVERNMENT SUPPORT 10 This invention was made with United States Government support under contract number HDTRA-1-07-C-0096. The United States Government has certain rights in the invention. FIELD OF THE INVENTION 15 The present invention relates to integrated sample preparation and sequencing systems and stabilized enzyme mixtures. In particular, the present invention provides microfluidic cards configured for processing a sample and generating DNA libraries that are suitable for use in sequencing methods (e.g., next generation sequencing methods) or other suitable nucleic acid analysis methods, where the output from these cards can be 20 integrated with a DNA sequencing system providing an automated and integrated sample to sequence system. The present invention also provides stabilized enzyme mixtures containing an enzyme (e.g., an enzyme used in whole genome amplification), BSA, and a sugar. Such enzyme mixtures may be lyophilized and stored at room temperature without significant loss of enzyme activity for months. 25 BACKGROUND Sequencing of DNA requires large amounts of extracted DNA for use in the preparation of a sequencing library. The process of culturing cells, lysing the cells, extracting DNA, fragmenting the DNA, ligating linkers, and purification of the 30 sequencing template is a multi-step process that can take several days to be performed by a skilled research technician. The challenge of sequence based detection is that existing 1 WO 2011/140489 PCT/US2011/035597 whole genome sequencing systems such as the Roche 454 require several days of sample preparation and several days for sequencing. Figure 1 shows a flow chart demonstrating the lengthy process now involved in sample preparation for next-generation sequencing techniques, such as the Roche 454 method. As shown in this figure, it can take one day 5 for sample pretreatment; cell lysis; nucleic acid extraction; and whole genome amplification (WGA). It can then take one to five days for generating DNA libraries, which involves the following steps: DNA fragmentation; DNA end repair; adaptor ligation; fragment immobilization; nick repair; single-strand DNA isolation; and emulsion PCR titration. Finally, it can then take one to four days to prepare the sample 10 for sequencing and the sequencing itself using the following steps: bulk emulsion PCR; break emulsion PCR; purify PCR positive beads; prepare beads for sequencing; and performing the sequencing reaction. What is needed are methods for preparing DNA sequencing libraries that are faster and easier to perform and the integration of these methods with the sequencers. 15 SUMMARY OF THE INVENTION The present invention provides integrated sample preparation/nucleic acid sequencing systems and stabilized enzyme mixtures. In particular, the present invention provides microfluidic cards configured for processing a sample and generating DNA 20 libraries that are suitable for use in sequencing methods (e.g., next generation sequencing methods) or other suitable nucleic acid analysis methods. The present invention also provides stabilized enzyme mixtures containing an enzyme (e.g., an enzyme used in whole genome amplification), BSA, and a sugar. Such enzyme mixtures may be lyophilized and stored at room temperature without significant loss of enzyme activity for 25 months. In certain embodiments, the present invention provides microfluidic cards comprising: a) a loading port configured for introduction of a biological sample; b) a fragmentation sub-circuit comprising: i) a reagent mixture configured for digesting nucleic acid (e.g., amplified nucleic acid) to generate fragmented nucleic acid, and/or ii) a 30 fragmentation component configured for mechanically fragmenting nucleic acid to generate fragmented nucleic acid; and c) a linker ligation sub-circuit operably linked to 2 WO 2011/140489 PCT/US2011/035597 said fragmentation sub-circuit, wherein said linker ligation sub-circuit comprises: i) nucleic acid linkers configured for use in sequencing methods or other methods, and ii) a ligation enzyme mixture configured for ligating said nucleic acid linkers to said fragmented nucleic acid to generate a nucleic acid sequencing library. 5 In certain embodiments, the present invention provides microfluidic cards comprising: a) a loading port configured for introduction of a biological sample; b) a cell lysis subcircuit; c) as nucleic acid extraction subcircuit; d) a nucleic acid amplification subcircuit wherein said amplification subcircuit comprises i) a target sequence specific amplification such as PCR or ii) a total nucleic acid amplification subcircuit such as 10 whole genome amplification by multiple displacement amplification; e) a fragmentation sub-circuit comprising: i) a reagent mixture configured for digesting nucleic acid (e.g., amplified nucleic acid) to generate fragmented nucleic acid, and/or ii) a fragmentation component configured for physically fragmenting nucleic acid to generate fragmented nucleic acid; f) end polishing of fragmented nucleic acid; g) a linker ligation sub-circuit 15 operably linked to said fragmentation sub-circuit, wherein said linker ligation sub-circuit comprises: i) nucleic acid linkers configured for use in sequencing methods or other methods, and ii) a ligation enzyme mixture configured for ligating said nucleic acid linkers to said fragmented nucleic acid to generate a nucleic acid sequencing library; h) methods for the removal of non-ligated or partially ligated nucleic acids; i) This can be 20 performed enzymatically using for example exonucleases and or ii) by bind and elute extraction or iii) by affinity isolations using affinity tags as biotin labeled ligation products; i) final library purification by enzymatic or bind elute or affinity or size exclusion etc; j) integration with a sequencing system. In particular embodiments, the microfluidics cards further comprise at least one 25 additional sub-circuit selected from the following group: 1) a lysis sub-circuit (e.g., operably linked to said loading port) comprising: i) a mixing chamber and, ii) lysis buffer (e.g., in a sealed package); 2) a nucleic acid extraction sub-circuit (e.g., operably linked to both said lysis sub-circuit and a waste chamber), wherein said nucleic acid extraction sub-circuit comprises: i) a nucleic acid extraction component configured to bind nucleic 30 acids present in a lysed sample, ii) a wash buffer (e.g., in a sealed package), iii) an elution buffer (e.g., in a sealed package), and iv) a pump component (e.g., configured for 3 WO 2011/140489 PCT/US2011/035597 pumping the elution buffer over the nucleic acid extraction component to generate a mixture of extracted nucleic acids); 3) an amplification sub-circuit (e.g., operably linked to the nucleic acid extraction sub-circuit) comprising a stabilized enzyme mixture, wherein said stabilized enzyme mixture comprises at least one amplification-related 5 enzyme useful for performing amplification on the extracted nucleic acid to generate amplified nucleic acid; and 4) a waste chamber; In certain embodiments, the present invention provides microfluidic cards comprising: a) a loading port configured for introduction of a biological sample; b) an amplification sub-circuit (e.g., operably linked to the nucleic acid extraction sub-circuit) 10 comprising a stabilized enzyme mixture, wherein said stabilized enzyme mixture comprises at least one amplification-related enzyme useful for performing whole genome amplification on nucleic acids to generate amplified nucleic acid. In some embodiments, the present invention provides microfluidic cards comprising: a) a loading port configured for introduction of a biological sample; b) a 15 waste chamber; c) a cell lysis sub-circuit operably linked to the loading port, wherein the cell lysis sub-circuit comprises: i) a mixing chamber and, ii) a first sealed package containing lysis buffer; wherein the lysis sub-circuit is configured to lyse the biological sample in the mixing chamber with the lysis buffer to generate a lysed sample; d) a nucleic acid extraction sub-circuit operably linked to both the cell lysis sub-circuit and 20 the waste chamber, wherein the nucleic acid extraction sub-circuit comprises: i) a nucleic acid extraction component configured to bind nucleic acids present in the lysed sample, ii) a second sealed package containing wash buffer, iii) a third sealed package containing elution buffer, and iv) a pump component configured for pumping the elution buffer over the nucleic acid extraction component to generate a mixture of extracted nucleic acids; e) 25 an amplification sub-circuit operably linked to the nucleic acid extraction sub-circuit, wherein the amplification sub-circuit comprises a stabilized enzyme mixture, wherein the stabilized enzyme mixture comprises at least one amplification-related enzyme useful for performing amplification on the extracted nucleic acid to generate amplified nucleic acid; f) a fragmentation sub-circuit operably linked to the amplification sub-circuit, wherein 30 the fragmentation sub-circuit comprises: i) a reagent mixture configured for digesting the amplified nucleic acid to generate fragmented nucleic acid, and/or ii) a fragmentation 4 WO 2011/140489 PCT/US2011/035597 component configured for mechanically fragmenting the amplified nucleic acid to generate fragmented nucleic acid; and g) a linker ligation sub-circuit operably linked to the fragmentation sub-circuit, wherein the linker ligation sub-circuit comprises: i) nucleic acid linkers (adaptors) configured for use in sequencing methods, and ii) a ligation 5 enzyme mixture configured for ligating the nucleic acid linkers to the fragmented nucleic acid to generate a nucleic acid sequencing library. In certain embodiments, the at least one amplification-related enzyme comprises an enzyme useful for performing whole genome amplification (WGA) (e.g., multiple displacement amplification), or useful for performing PCR, or useful for performing 10 transcription mediated amplification (TMA). In some embodiments, the at least one amplification-related enzyme is selected from the group consisting of: Phi-29 polymerase, E. coli DNA polymerase I, inorganic pyrophosphatase, or any combination thereof. In certain embodiments, the amplification related enzymes are combined with linkers (adapters) that are used in next-generation sequencing, such as the next-generation 15 sequencing methods described herein. In particular embodiments, the primer used for any amplification step (e.g., PCR) comprise linkers that are useful in next-generation sequencing methods (e.g., for tethering the amplicons to a solid support). In particular embodiments, the stabilized enzyme mixture further comprises: i) BSA, ii) a sugar, and iii) at least one additional component selected from the group 20 consisting of: an inorganic salt, a divalent metal cation, a buffering agent, an emulsifier, and a reducing agent. In other embodiments, the stabilized enzyme mixture further comprises: i) BSA, ii) a sugar, iii) an inorganic salt, iv) a divalent metal cation, v) a buffering agent, vi) an emulsifier, and vii) a reducing agent. In some embodiments, the microfluidic cards further comprise: h) a purification 25 sub-circuit operably linked to the linker ligation component, wherein the purification sub circuit comprises a nucleic acid purification component, wherein the nucleic acid purification component comprises anchored nucleic acid sequences configured to hybridize to the linkers on the nucleic acid sequencing library. In other embodiments, the microfluidic cards further comprise an outlet port configured to allow a user to withdraw 30 at least a portion of the nucleic acid sequencing library. In certain embodiments, the fragmentation subcircuit further comprises: at least one type of enzyme configured for 5 WO 2011/140489 PCT/US2011/035597 polishing the ends of the fragmented nucleic acid. In particular embodiments, the linker ligation sub-circuit further comprises: at least one type of enzyme configured for polishing the ends of the nucleic acid sequencing library. In other embodiments, the stabilized enzyme mixture is present in a dried format. In some embodiments, the 5 reagent mixture is present in a dried format. In further embodiments, the pump component comprises a bellows. In other embodiments, the nucleic acid extraction components comprises a membrane. In additional embodiments, the nucleic acid extraction components comprises a filter. In particular embodiments, the microfluidics cards comprise a plurality of valves. In 10 additional embodiments, the card is configured to operably link to, and be operated by, a processing instrument. In other embodiments, the microfluidics cards further comprise a plurality of air ports configured to operably link with a pneumatic interface on the processing instrument. In some embodiments, the nucleic acid linkers are configured for use in a sequencing method selected from the group consisting of: ABI SOLID, 15 ILLUMINA SOLEXA, ROCHE 454, ION TORRENT, Lifetechnologies STARLITE, and PACIFIC BIOSCIENCES SMRT sequencing. In additional embodiments, the microfluidics cards further comprise a sensor configured to determine if the mixture of extracted nucleic acids requires amplification or not. The sample preparation systems of the present invention may be integrated with 20 any type of sequencing system (e.g., as a re-usable card or disposable card). In certain embodiments, the sample preparation systems of the present invention are integrated with ILLIMINA SOLEXA sequencers including HiSeq 2000, HiSeq 1000, HiScanSQ, Genome Analyzer IIx, MiSeq, where the sample preparation systems may be configured to work with the related Illumina software, such as the PIPELINE and/or CASAVA 25 software packages. In other embodiments, the sample preparation systems of the present invention are integrated with the ROCHE 454 sequencers, including the Genome Sequencer FLX System and GS Junior System, where the sample preparation systems may be configured to work with the related GS Run Browser Software, GS De Novo Assembler Software, GS Reference Mapper Software, GS Amplicon Variant Analyzer 30 Software, and the GS FLX Titanium Cluster. In some embodiments, the sample preparation systems of the present invention are integrated with the ION TORRENT 6 WO 2011/140489 PCT/US2011/035597 sequencers, including the Ion Personal Genome Machine (PGM) sequencer, where the sample preparation systems may be configured to work with the related DNASTAR@ SeqMan@ NGen@ Software, Partek@ Genomics SuiteTM Software, NextGENe@ software for Ion PGM platform by SoftGenetics, or Avadis NGS Software. In additional 5 embodiments, the sample preparation systems of the present invention are integrated with the PACIFIC BIOSCIENCES sequencers, including the PacBio RS sequencer, where the sample preparation systems may be configured to work with the related RS remote software, RS touch software, Primary Analysis software, SMRT Portal software, and SMRT View software. 10 In some embodiments, the present invention provides systems comprising: a microfluidic card as described herein; and b) a processing instrument configured to receive and operate the microfluidics card. In certain embodiments, the processing instrument comprises at least one component selected from: a pressure reservoir, a vacuum reservoir, at least one pump, a plurality of valves, at least one heater, a 15 pneumatic interface, and an input-output computer connection. In additional embodiments, the processing instrument comprises: a pressure reservoir, a vacuum reservoir, at least one pump, a plurality of valves, at least one heater, a pneumatic interface, and an input-output computer connection. In some embodiments, the present invention provides stabilized enzyme mixtures 20 comprising, or consisting essentially of, or consisting of: a) at least one type of enzyme; b) bovine serum albumin (BSA); c) a sugar; and d) a buffering agent; and optionally water. In certain embodiments, the stabilized enzyme mixture further comprises, or consists essentially of, or consists of: at least one reagent selected from the group consisting of: an inorganic salt; a divalent metal cation; an emulsifier; and a reducing 25 agent. In particular embodiments, the present invention provides stabilized enzyme mixtures comprising, or consisting essentially of, or consisting of: a) at least one type of enzyme; b) bovine serum albumin (BSA); c) a sugar; d) an inorganic salt; e) a divalent metal cation; f) a buffering agent; g) an emulsifier; and h) a reducing agent. 30 In certain embodiments, the mixtures further comprise polyethylene glycol (PEG) (e.g., PEG-8000 or other weights). In further embodiments, the stabilized enzyme 7 WO 2011/140489 PCT/US2011/035597 mixture is in an aqueous form or in a lyophilized form. In other embodiments, the stabilized enzyme mixture allows the enzyme to retain at least 70% of its activity (e.g., 70% ... 75% ... 80% ... 85% ... 90% ... 95% ... 100%) upon hydration at 20-25 degrees Celsius after storage for two months at 20-40 degrees Celsius. 5 In further embodiments, the BSA is present at a concentration of 0.05% - 3.0% in the stabilized enzyme mixture (e.g., 0.05% ... 0.10% ... 0.5% ... 1.0% ... 2.0% ... 3.0%). In further embodiments, the sugar is present at a concentration of 5-35% of the stabilized enzyme mixture (e.g., 5 % ... 15 % ... 2 5 % ... 35%). In other embodiments, the sugar is a non-reducing sugar. In further embodiments, the sugar is a disaccharide. In additional 10 embodiments, the sugar is trehalose. In some embodiments, the at least one type of enzyme comprises a mesophilic enzyme, a thermolabilze enzyme, or a thermophilic enzyme. In additional embodiments, the at least one type of enzyme comprises a polymerase. In particular embodiments, the polymerase is Phi-29 polymerase. In further embodiments, the polymerase is E. coli 15 Polymerase I. In additional embodiments, the at least one type of enzyme comprises an inorganic pyrophosphatase. In certain embodiments, the inorganic pyrophosphatase is Saccharomyces cerevisiae inorganic pyrophosphatase. In additional embodiments, the at least one type of enzyme comprises: Phi-29 polymerase, E. coli. DNa Polymerase I, and S. cerevisiae inorganic pyrophosphatase. 20 In certain embodiments, the inorganic salt is present at a concentration of 1 mM 25 mM in the stabilized enzyme mixture (e.g., 1 mM ... 10 mM ... 17 mM ... 25 mM). In further embodiments, the inorganic salt is (NH4) 2

SO

4 . In certain embodiments, the divalent metal cation is present at a concentration of 1 mM - 30 mM in the stabilized enzyme mixture (e.g., 1 mM ... 10 mM ... 20 mM ... or 30 mM). In particular 25 embodiments, the divalent metal cation is MgCl 2 . In further embodiments, the buffering agent is present at a concentration of 10 mM - 100 mM (e.g., 10 mM ... 35 mM ... 75 mM ... 100 mM). In some embodiments, the buffering agent is Tris. In particular embodiments, the emulsifier is present at a concentration of 0.0l1% 0.15% in the stabilized enzyme mixture (e.g., 0

.

0 1 % ... 0

.

1 % ... 0.15%). In some 30 embodiments, the emulsifier is Tween 40, Tween 20, or Tween 80. In additional embodiments, the reducing agent is present at a concentration of 1 mM - 10 mM (e.g., 1 8 WO 2011/140489 PCT/US2011/035597 mM ... 5 mM ... 10 mM). In certain embodiments, the reducing agent is dithiothreitol (DTT). In some embodiments, the present invention provides compositions for stabilizing an enzyme comprising, consisting essentially of, or consisting of: a) bovine serum 5 albumin (BSA); b) a sugar; c) an inorganic salt; and optionally 1) a divalent metal cation; 2) a buffering agent; 3) an emulsifier; 4) a reducing agent; and 5) water. In further embodiments, the present invention provides compositions comprising, or consisting essentially of, or consisting of: E. coli polymerase I and bovine serum albumin (BSA), wherein the composition is a lyophilized composition. In particular 10 embodiments, the lyophilized composition allows the E. coli polymerase I to retain at least 70% of its activity (e.g., 70% ... 90% ... 100%) upon hydration at 20-25 degrees Celsius after storage for at least one, two, or three months at 20-40 degrees Celsius. In certain embodiments, the present invention provides compositions comprising, or consisting essentially of, or consisting of: inorganic phosphatase and bovine serum 15 albumin (BSA), wherein the composition is a lyophilized composition. In some embodiments, the lyophilized composition allows the inorganic phosphatase to retain at least 70% (e.g., 70% ... 90% ... 100%) of its activity upon hydration at 20-25 degrees Celsius after storage for two months at 20-40 degrees Celsius. In further embodiments, the present invention provides methods of storing a 20 lyophilized composition comprising: a) providing a lyophilized composition comprising, or consisting essentially of, or consisting of: i) at least one type of enzyme; ii) bovine serum albumin (BSA); iii) a sugar; iv) an inorganic salt; v) a divalent metal cation; vi) a buffering agent; vii) an emulsifier; and viii) a reducing agent; and b) storing the lyophilized composition at a storage temperature of 15-45 degrees Celsius for at least 15 25 days such that the at least one enzyme retains at least 70% of its activity upon hydration at 20-25 degrees Celsius. In further embodiments, the at least 15 days is at least 30 days (e.g., at least 30 days ... 60 days ... 90 days ... 120 days ... or longer). In certain embodiments, the storage temperature is 20-25 degrees Celsius. In some embodiments, the at least one enzyme is selected from E. coli polymerase I, Phi-29 polymerase, and 30 inorganic pyrophosphatase. 9 WO 2011/140489 PCT/US2011/035597 In particular embodiments, the present invention provides methods of generating a stabilized enzyme composition comprising: a) providing: i) an aqueous composition comprising, or consisting essentially of, or consisting of: A) at least one type of enzyme; B) bovine serum albumin (BSA); C) a sugar; D) an inorganic salt; E) a divalent metal 5 cation; F) a buffering agent; G) an emulsifier; and H) a reducing agent; and ii) a dializing membrane; and b) dialyzing the aqueous composition with the dialzying membrane into a solution comprising or consisting essentially of: i) the sugar; ii) the inorganic salt; iii) the divalent metal cation; iv) the buffering agent; v) the emulsifier; and vii) the reducing agent; c) freezing the aqueous composition to generate a frozen composition; and d) 10 subjecting the frozen composition to high vacuum to remove water via sublimation such that a lyophilized composition is generated. DESCRIPTION OF THE FIGURES Figure 1 shows a flow chart demonstrating the lengthy process now involved in 15 sample preparation for next-generation sequencing techniques, such as the Roche 454 method. Figure 2 shows an exemplary injected molded microfluidic card and the various layers that may make up a card. Figure 2 also describes the first three sub-circuits of cell lysis, DNA extraction, and whole genome amplification. 20 Figure 3 shows an exemplary microfluidic card with various sub-circuits labeled, including a sample inlet port, a DNA extraction circuit, and an amplification circuit which includes lyophilized enzymes (e.g., such as those described below in Example 1). Figure 4 shows step 1 of a sample preparation process utilizing a microfluidic card. This figure specifically shows a sample inlet port and a mixing chamber. 25 Figure 5 shows step 2 which is a lysis step. Lysis buffer from a blister pack flows into a mixing chamber with cells from the sample such that the cells are lysed. Figure 6 shows step 3 where the lysed mixture is passed over a capture filter and then to a waste chamber. A first wash buffer from a blister pack is then passed over the filter before going into the waste chamber. 30 Figure 7 shows step 4 where a second wash is passed through the capture filter and then on to the waste chamber. The filter is then air dried to remove the wash buffer. 10 WO 2011/140489 PCT/US2011/035597 Figure 8 shows step 5 where an elution buffer from a blister pack removes the purified nucleic acid from the filter using an elution bellows. The elution bellows pumps the elution buffer slowly over the filter. Figure 9 describes the three reference samples (S. aureus; B. cereus; and K. 5 pneumoniae) that were used during development of embodiments of the present invention in order to evaluate the lysis and extraction steps. Figure 10 shows the results of final validation of the lysis and extraction sub circuits using S. aureus; B. cereus; and K. pneumoniae. The results shown are for inputs of 10,000 CFUs of B. cereus and K. pneumoniae, and freshly grown cultures of S. aureus. 10 Figure 11 shows production of contamination-free whole genome amplification reagents. Figure 12 shows step 6 where the purified nucleic acid sample is passed into the amplification sub-circuit with the reagents (including stabilized enzyme mixture lyophilized beads) inside the card. 15 Figure 13 shows an exemplary microfluidic card with the reagents (including stabilized enzyme mixture lyophilized beads) inside the card, as well as the configuration of the buffer packs. Figure 14 describes that prior art WGA enzyme mixtures were not stable during storage, with stability for only 5 days at room temperature. Figure 14 also describes the 20 advantages of lyophilized mixtures of amplification enzymes, which are provided in Example I below. Figure 15 shows that many excipient formulations were tested (in Example 1) for compatibility with Phi-29, Polymerase I, and inorganic pyrophosphatase. Figure 16 shows results from Example 1 indicating that BSA is an important 25 component for stabilizing amplification enzymes. Figure 17 shows that a number of BSA levels (0.13%- 1 % final concentration) as well as the addition of 0.5% (final concentration) of PEG-8000 were tested in the enzyme stabilization formulations as described in Example 1. Figure 18 shows that the lyophilized enzymes in Ibis Formula 33 when stored at 30 room temperature for 4 months performed equal to fresh enzyme. 11 WO 2011/140489 PCT/US2011/035597 Figure 19 shows that the lyophilized enzymes in Ibis Formula 33 performed equal to fresh enzyme after two months at 40 degrees Celsius. Figure 20 shows an exemplary microfluidic card including a molded cartridge (with a waste pad and liquid reagents), a top lid, a laminate bottom, and a pneumatic 5 gasket. Figure 21 shows an image of an exemplary buffer blister pack. Figure 21 describes how molded sharps on the microfluidic card can be used to puncture the blister packs and release their stored reagents. Figure 22 shows a schematic of an exemplary processing instrument used to 10 interface with and operate the microfluidic cards. Figure 23 shows an exemplary system overview of a consumable microfluidic card working with the processing instrument. Figure 24 shows exemplary results of fragmenting an amplified sample with either physical or enzymatic means. 15 DEFINITIONS As used herein, the phrase "microfluidic card" refers to a device, cartridge or "card" with selected internal channels, voids or other microstructures having at least one dimension on the order of 0.1 to 500 microns. Microfluidic devices may be fabricated 20 from various materials using techniques such as laser stenciling, embossing, stamping, injection molding, masking, etching, and three-dimensional soft lithography. Laminated microfluidic devices are further fabricated with adhesive interlayers or by thermal adhesiveless bonding techniques, such as by pressure treatment of oriented polypropylene. The microarchitecture of laminated and molded microfluidic devices can 25 differ. In certain embodiments, the microfluidic cards of the present invention are designed to interact or "dock" with a host instrument that provides a control interface and optional temperature and magnetic interfaces. The card, however, generally contains all biological reagents needed to perform the assay and requires only application of a sample or samples. These cards are generally disposable, single-use, and are generally 30 manufactured with sanitary features to minimize the risks of exposure to biohazardous material during use and upon disposal. 12 WO 2011/140489 PCT/US2011/035597 The term "whole genome amplification" or "WGA" as used herein generally refers to a method for amplification of a limited DNA sample in a non-specific manner (unless targeted WGA is employed), in order to generate a new sample that is indistinguishable from the original but with a higher DNA concentration. The ideal 5 whole genome amplification technique would amplify a sample up to a microgram level while maintaining the original sequence representation. The DNA of the sample may include an entire genome or a portion thereof. Degenerate oligonucleotide-primed PCR (DOP), primer extension PCR technique (PEP) and multiple displacement amplification (MDA), are examples of whole genome amplification methods. 10 The term "multiple displacement amplification" as used herein, refers to a non PCR-based isothermal method based on the annealing of random hexamers (or non random primers in targeted methods) to denatured DNA, followed by strand displacement synthesis at constant temperature. It has been applied to small genomic DNA samples, leading to the synthesis of high molecular weight DNA with limited 15 sequence representation bias. As DNA is synthesized by strand displacement, a gradually increasing number of priming events occur, forming a network of hyper-branched DNA structures. The reaction can be catalyzed by, for example, the Phi29 DNA polymerase or by the large fragment of the Bst DNA polymerase. 20 DETAILED DESCRIPTION The present invention provides integrated sample preparation systems and stabilized enzyme mixtures. In particular, the present invention provides microfluidic cards configured for processing a sample and generating DNA libraries that are suitable for use in sequencing methods (e.g., next generation sequencing methods) or other 25 suitable nucleic acid analysis methods. The present invention also provides stabilized enzyme mixtures containing an enzyme (e.g., an enzyme used in whole genome amplification), BSA, and a sugar. Such enzyme mixtures may be lyophilized and stored at room temperature without significant loss of enzyme activity for months. 30 I. Microfluidic Cards and Instruments The present invention provides for the integration of several molecular biology 13 WO 2011/140489 PCT/US2011/035597 processes/steps into a single integrated system using a microfluidic card. The integrated system can then, for example, be used to take samples (e.g., clinical, biological, environmental) and lyse the cells, extract the nucleic acids, amplify the extracted nucleic acids, (e.g., whole genome amplify), fragment the amplified nucleic acid, polish the DNA 5 fragment ends, ligate linkers and purify the processed nucleic acid (e.g., a DNA sequencing library suitable for sequencing). The integrated process dramatically reduces the processing time, labor and improves the consistency of the process through the use of automation and quality controlled reagents that are integrated into the single use system. The entire process can be integrated into single use microfluidic card that contains 10 all the reagents needed to carry out the process. In some embodiments, the process wastes are also contained within the cards. The reagents can be stabilized so that the cards can be stored at room temperature for long periods of time. The cards generally contain a port where the resulting processed can be removed and used with a variety of DNA sequencing technologies such as Sanger sequencing, ABI SOLID, Illumina Solexa, 15 Roche 454, Ion Torrent, ABI Starlite, PacBio SMRT, and other nucleic acid analysis techniques. In certain embodiments, the microfluidic cards manufactured by Micronics Inc. and described in their patent publications are employed as part of the present invention. Micronics' PanNATTM molecular diagnostic platform is described as a convenient, 20 battery and/or main powered instrument capable of processing distinct cartridges, each designed to perform a single and /or multiplexed nucleic acid amplification assay. Each assay is fully integrated into the disposable cartridge that includes all necessary reagents. Only a small volume of biological sample is required for assay performance. A description of certain Micronics cards are provided in U.S. Patent Publication 25 20090325276, which is herein incorporated by reference in its entirety as if fully set forth herein. In certain embodiments, the microfluidic cards employed with the present invention are as described in the following paragraphs. Microfluidic cards are formed from multiple subcircuits corresponding to independent assay modules, but integrated together in a single device or two or more 30 interconnected devices. Each subcircuit in turn is preferably made up of microfluidic elements or components. Elements of these subcircuits may include microfluidic 14 WO 2011/140489 PCT/US2011/035597 channels, tees, chambers, valves, filters, solid phase capture elements, isolation filters, pneumatic manifolds, blister packs (e.g., with reagent pouches), waste sequestration chambers, sanitary vents, bellows chambers, bellows pumps, optical windows, test pads, and microchannel-deposits of dehydrated reagents, optionally including buffers, 5 solubilizers, and passivating agents. The subcircuits are generally fabricated of plastic, and may be made by lamination, by molding, and by lithography, or by a combination of these technologies. The card devices are typically single-entry, meaning that after a sample or samples are introduced, the device is sealed so that any potential biohazard is 10 permanently entombed in the card for disposal. However, in certain embodiments, the cards have an outlet port for removal of resulting DNA libraries. The cards are typically self-contained, in that any reagents needed for the assay are supplied with the device by the manufacturer. It is understood that microfluidic devices optionally may include RFID, microchips, bar codes, and labeling as an aid in processing analytical data and that 15 the host instrument for card docking is optionally a smart instrument and can communicate patient data and test results to a network. Microfluidic channels also termed "microchannels," are fluid channels having variable length, but one dimension in cross-section is less than 500 um. Microfluidic fluid flow behavior in a microfluidic channel is highly non-ideal and laminar and may be 20 more dependent on wall wetting properties, roughness, liquid viscosity, adhesion, and cohesion than on pressure drop from end to end or cross-sectional area. The microfluidic flow regime is often associated with the presence of "virtual liquid walls" in the channel. Microfluidic channels are fluidly connected by "tees" to each other or to other process elements. Valves are formed in microfluidic channels, and may be check valves, 25 pneumatic check valves, pinch valves, surface tension valves, and the like, as conventionally used. The card devices generally contain an overlying pneumatic manifold that serves for control and fluid manipulation, although electronically activated valves could also be used. Air ports are connected to the pneumatic manifold, and generally activate bellows 30 pumps. Where the valves are pneumatically actuated, air ports are also implicated. Air ports are sometimes provided with hydrophobic isolation filters (e.g., any liquid 15 WO 2011/140489 PCT/US2011/035597 impermeable, gas-permeable filter membrane) where leakage of fluid from within the device is undesirable and unsafe. Vents are not generally directly connected to the pneumatic manifold, but serve to equalize pressures within it. Reaction chambers are provided on the microfluidic cards and can be any suitable 5 shape, such as rectangular chambers, circular chambers, tapered chambers, serpentine channels, and various geometries for performing a reaction. These chambers may have windows for examination of the contents, as in detection chambers. Waste sequestration receptacles are generally provided on the microfluidic cards. Waste receptacles are optionally vented with sanitary hydrophobic membranes. 10 Figure 2 shows an exemplary injected molded microfluidic card and the various layers that may make up a card. Figure 2 also describes the first three sub-circuits of cell lysis, DNA extraction, and whole genome amplification. Figure 3 shows an exemplary microfluidic card with various sub-circuits labeled, including a sample inlet port, a DNA extraction circuit, and an amplification circuit 15 which includes lypholized enzymes (e.g., such as those described below in Example 1). Figure 4 shows step 1 of a sample preparation process utilizing a microfluidic card. This figure specifically shows a sample inlet port and a mixing chamber. Figure 5 shows step 2 which is a lysis step. Lysis buffer from a blister pack flows into a mixing chamber with cells from the sample such that the cells are lysed. 20 Figure 6 shows step 3 where the lysed mixture is passed over a capture filter and then to a waste chamber. A first wash buffer from a blister pack is then passed over the filter before going to the waste chamber. Figure 7 shows step 4 where a second wash is passed through the capture filter and then on to the waste chamber. The filter is then air dried to remove the wash buffer. 25 Figure 8 shows step 5 where an elution buffer from a blister pack removes the purified nucleic acid from the filter using an elution bellows. The elution bellows pumps the elution buffer slowly over the filter. Figure 9 describes the three reference samples (S. aureus; B. cereus; and K. pneumoniae) that were used during development of embodiments of the present invention 30 in order to evaluate the lysis and extraction steps. 16 WO 2011/140489 PCT/US2011/035597 Figure 10 shows the results of final validation of the lysis and extraction sub circuits using S. aureus; B. cereus; and K. pneumoniae. The results shown are for inputs of 10,000 CFUs of B. cereus and K. pneumoniae, and freshly grown cultures of S. aureus. Figure 11 production of contamination-free whole genome amplification reagents. 5 In certain embodiments, reagents used for WGA are passed through a DNA absorbing unit and a 0.2uM sterile filter. The results are purified reagents, where the negative controls do not produce DNA even after 12 hours. Figure 12 shows step 6 where the purified nucleic acid sample is passed into the amplification sub-circuit. In this circuit, whole genome amplification can be performed 10 using a zone where the purified sample mixes with the amplification buffer (which can be the same as the elution buffer) and heated to 95 degrees Celsius and then moved to a reaction zone where it mixes with the amplification enzymes at 30 degrees Celsius. Preferably, the enzymes are lyophilized amplification enzymes that are part of stabilized enzyme mixtures as described in Example 1 below. 15 Figure 13 shows an exemplary microfluidic card with the reagents (including stabilized enzyme mixture lyophilized beads) dried inside the card, as well as the configuration of the buffer packs. Figure 14 describes that prior art WGA enzyme mixtures were not stable during storage, with stability for only 5 days at room temperature. Figure 14 also describes the 20 advantages of lyophilized mixtures of amplification enzymes, which are provided in Example 1 below. Figure 20 shows an exemplary microfluidic card including a molded cartridge (with a waste pad and liquid reagents), a top lid, a laminate bottom, and a pneumatic gasket. 25 Figure 21 shows an image of an exemplary buffer blister pack. Figure 21 describes how molded sharps on the microfluidic card can be used to puncture the blister packs and release their stored reagents. Figure 22 shows a schematic of an exemplary processing instrument used to interface with and operate the microfluidic cards. As described in this figure, the 30 processing instrument includes a processor to run the instrument; an input-output that may include a USB or Ethernet connection; an LCD screen to provide status to a user; 17 WO 2011/140489 PCT/US2011/035597 and a touch screen for user control. The processing instrument may also include a pneumatic system containing air pumps, regulators, manifolds, pressure/vacuum reservoirs; and valves. The processing instrument may also include a card/cartridge interface with clamps, a pneumatic manifold, and heaters. 5 Figure 23 shows an exemplary system overview of the consumable microfluidic card working with the processing instrument. Figure 24 shows exemplary results of fragmenting a WGA amplified sample with either physical or enzymatic means. Such fragmentation may be performed in step 7 in the microfluidic card in a fragmentation sub-circuit. The amplified sample may be 10 moved to the fragmentation sub-circuit and then be fragmented using mechanical shearing (e.g., by passing through an orifice in the fragmentation sub-circuit) or may be subjected to restriction enzymes. Fragmentation methods that may be employed include, but are not limited to, cleavage with restriction enzymes or cleavage primers, for example. Methods of using restriction enzymes and cleavage primers are well known to 15 those with ordinary skill in the art. The ends of the fragments may then be polished with enzymes, such as Klenow fragment. In certain embodiments, the next sub-circuit in the microfluidic cards is a linker ligation sub-circuit. In this sub-circuit, linkers are ligated to the ends of the fragmented nucleic acid. Preferably the linkers are those used in sequencing methods, such as those 20 used in ABI SOLID, ILLUMINA SOLEXA, ROCHE 454, ION TORRENT, ABI STARLITE, and PACIFIC BIOSCIENCES SMRT sequencing. A description of these sequencing technologies and associated linkers is provided further below. I. Whole Genome Amplification Methods 25 In certain embodiments, the microfluidic cards have reagents necessary, sufficient, or useful to perform whole genome amplification (WGA) in the amplification sub-circuit. It is noted that the present invention is not limited to WGA as the amplification technology, as any other type of suitable amplification technology (and corresponding reagents) maybe employed, such as PCR or TMA, both of which are well 30 known in the art. 18 WO 2011/140489 PCT/US2011/035597 A. Non-Target WGA In many fields of research such as genetic diagnosis, cancer research or forensic medicine, the scarcity of genomic DNA can be a severely limiting factor on the type and quantity of genetic tests that can be performed on a sample. One approach designed to 5 overcome this problem is whole genome amplification (WGA). The objective is to amplify a limited DNA sample in a non-specific manner in order to generate a new sample that is indistinguishable from the original but with a higher DNA concentration. The aim of a typical whole genome amplification technique would be to amplify a sample up to a microgram level while respecting the original sequence representation. 10 The first whole genome amplification methods were described in 1992, and were based on the principles of the polymerase chain reaction. Zhang and coworkers (Zhang, L., et al. Proc. Natl. Acad. Sci. USA, 1992, 89: 5847-585 1, herein incorporated by reference) developed the primer extension PCR technique (PEP) and Telenius and collaborators (Telenius et al., Genomics. 1992, 13(3):718-25, herein incorporated by 15 reference) designed the degenerate oligonucleotide-primed PCR method (DOP-PCR) Zhang et al., 1992). DOP-PCR is a method which uses Taq polymerase and semi-degenerate oligonucleotides (such as CGACTCGAGNNNNATGTGG (SEQ ID NO: 1), for example, where N=A, T, C or G) that bind at a low annealing temperature at approximately one 20 million sites within the human genome. The first cycles are followed by a large number of cycles with a higher annealing temperature, allowing for the amplification of the fragments that were tagged in the first step. Multiple displacement amplification (MDA, also known as strand displacement amplification; SDA) is a non-PCR-based isothermal method based on the annealing of 25 random hexamers to denatured DNA, followed by strand-displacement synthesis at constant temperature (Blanco et al., 1989, J. Biol. Chem. 264:8935-40, herein incorporated by reference). It has been applied to small genomic DNA samples, leading to the synthesis of high molecular weight DNA with limited sequence representation bias (Lizardi et al., Nature Genetics 1998, 19, 225-232; Dean et al., Proc. Natl. Acad. Sci. 30 U.S.A. 2002, 99, 5261-5266; both of which are herein incorporated by reference). As DNA is synthesized by strand displacement, a gradually increasing number of priming 19 WO 2011/140489 PCT/US2011/035597 events occur, forming a network of hyper-branched DNA structures. The reaction can be catalyzed by the Phi29 DNA polymerase or by the large fragment of the Bst DNA polymerase. The Phi29 DNA polymerase possesses a proofreading activity resulting in error rates 100 times lower than the Taq polymerase. 5 In some embodiments, the reaction mixtures employed for the multiple displacement amplification include a plurality of polymerase enzymes. In some embodiments, the catalytic activities include 5'-3' DNA polymerase activity, 3'-5' exonuclease proofreading activity, and DNA repair activities such as, for example, 5' - 3' excision repair activity. Examples of various polymerase enzymes include, but are not 10 limited to, the following: Phi29, Klenow fragment, T4 polymerase, T7 polymerase, BstE polymerase, E. coli Pol I, Vent, Deep Vent, Vent exo-, Deep Vent exo-, KOD HiFi, Pfu ultra, Pfu turbo, Pfu native, Pfu exo-, Pfu exo- Cx, Pfu cloned, PROOFSTART (Qiagen), rTth, Tgo and Tfu Qbio. These polymerases are known and most are commercially available. 15 In other embodiments, other non-polymerase enzymes or accessory proteins are included in the MDA reaction mixtures such as, for example, helicase, gyrase, T4G32 and SSBP for example. In some embodiments, the reaction mixture for MDA includes pyrophosphatase which serves to convert pyrophosphate to phosphate. Pyrophosphate accumulates in the reaction mixture as a result of the amplification reaction (one 20 equivalent of pyrophosphate is generated from each incorporated deoxynucleotide triphosphate added and is known to inhibit the amplification reaction). In some embodiments about 0.004 units of pyrophosphate is added to the reaction mixture. B. Targeted WGA 25 In certain embodiments, targeted whole genome amplification (TWGA) is employed as part of the present invention. Targeted WGA is described, for example, in U.S. Pat. Pub. 20100035232, herein incorporated by reference. Target Genomes for Design of Targeted Whole Genome Amplfication Primers 30 In some preferred embodiments, one or more target genomes are chosen. The choice of target genomes is dictated by the objective of the analysis. For example, if the 20 WO 2011/140489 PCT/US2011/035597 desired outcome of the targeted whole genome amplification process is to obtain nucleic acid representing the genome of a biowarfare organism such as Bacillus anthracis, which is suspected of being present in a soil sample at the scene of a biowarfare attack, one may choose to select the genome of Bacillus anthracis as the one and only target genome. If, 5 on the other hand, the desired outcome of the targeted whole genome amplification process is to obtain nucleic acid representing a group of bacteria, such as, a group of potential biowarfare agents, more than one target genome may be selected such as, a group comprising any or all of the following bacteria: Bacillus anthracis, Francisella tularensis, Yersinia pestis, Brucella sp., Burkholderia mallei, Rickettsia prowazekii, and 10 Escherichia coli 0157. Likewise, a different genome or group of genomes could be selected as the target genome(s) for other purposes. For example, a human genome or mitochondrial DNA may be the target over common genomes found in a soil sample or other sample environments where a crime may have taken place. Thus, the current methods and compositions can be applied and the human genome (target) selectively 15 amplified over the background genomes. Other examples could include the genomes of group of viruses that cause respiratory illness, pathogens that cause sepsis, or a group of fungi known to contaminate households. Background Genomes for Design of Targeted Whole Genome Amplification 20 Primers Background genomes may be selected based on the likelihood of the nucleic acid of certain organisms being present. For example, a soil sample which was handled by a human would be expected to contain nucleic acid representing the genomes of organisms including, but not limited to: Homo sapiens, Gallus gallus, Guillardia theta, Oryza 25 sativa, Arabidopsis thaliana, Yarrowia lipolytica, Saccharomyces cerevisiae, Debaryomyces hansenii, Kluyveromyces lactis, Schizosaccharmyces pom, Aspergillus fumigatus, Cryptococcus neoformans, Encephalitozoon cuniculi, Eremothecium gossypii, Candida glabrata, Apis mellfera, Drosophila melanogaster, Tribolium castaneum, Anopheles gambiae, and Caenorhabditis elegans. Any or all of these genomes are 30 appropriate to estimate as background genomes in the sample. The organisms actually in any particular sample will vary for each sample based upon the source and/or 21 WO 2011/140489 PCT/US2011/035597 environment. Therefore, background genomes may be selected based upon the identities of organisms actually present in the sample. The composition of a sample can be determined using any of a number of techniques known to those ordinarily skilled in the art. In a further embodiment, the primers can be designed based upon actual 5 identification of one or more background organisms in the sample, and based upon likelihood of any further one or more background organisms being in the sample. Identification of Unique Genome Sequence Segments as Primer Hybridization Sites 10 Once the target and background genomes of a sample are determined, the next step is to identify genome sequence segments within the target genome which are useful as primer hybridization sites. The efficiency of a given targeted whole genome amplification is dependent on effective use of primers. To produce an amplification product representative of a whole genome, the primer hybridization sites should have 15 appropriate separation across the length of the genome. Preferably the mean separation distance between the primer hybridization sites is about 1000 nucleobases or less. More preferably the mean separation is about 800 nucleobases in length or less. Even more preferably, the mean separation is about 600 nucleobases in length or less. Most preferably, the mean separation between primer hybridization sites is about 500 20 nucleobases in length or less. One with ordinary skill in the art will recognize that effective priming for whole genome amplification depends upon several factors such as the fidelity and processivity of the polymerase enzyme used for primer extension. A longer mean separation distance between primer hybridization sites becomes more acceptable if the polymerase enzyme 25 has high processivity. This indicates that the polymerase binds tightly to the nucleic acid template. This is a desirable characteristic for targeted whole genome amplification because it enables the polymerase to remain bound to the template nucleic acid and continue to extend the complementary nucleic acid strand being synthesized. Examples of polymerase enzymes having high processivity include, but are not limited to Phi29 30 polymerase and Taq polymerase. Protein engineering strategies have been used to produce high processivity polymerase enzymes, for example, by covalent linkage of a 22 WO 2011/140489 PCT/US2011/035597 polymerase to a DNA-binding protein (Wang et al., Nucl. Acids Res., 2004, 32(3) 1197 1207, herein incorporated by reference). As polymerases with improved processivity become available, longer mean separation distances, even greatly exceeding 1000 nucleobases may be acceptable for targeted whole genome amplification. 5 Hybridization Sensitivity and Selectivity For the purpose of targeted whole genome amplification, the choice of length of the primer hybridization sites (genome sequence segments) and the lengths of the corresponding primers hybridizing thereto, preferably will balance two factors; (1) 10 sensitivity, which indicates the frequency of binding of a given primer to the target genome, and (2) selectivity, which indicates the extent to which a given primer hybridizes to the target genome with greater frequency than it hybridizes to background genomes. Generally, longer primers tend toward greater selectivity and lesser sensitivity while the converse holds for shorter primers. Preferably primers of about 5 to about 13 15 nucleobases in length are useful for targeted whole genome amplification; however, primer lengths falling outside of this range can be used as well. One will recognize that this range comprises primers having lengths of 5, 6, 7, 8, 9, 10, 11, 12 and 13 nucleobases. Primer size affects the balance between selectivity of the primer and sensitivity of the primer. Optimal primer length is determined for each sample with this 20 balance in mind. Primers with lengths less than 5 nucleobases or greater than 13 nucleobases are also useful if the selectivity and sensitivity can be optimally maintained for that sample. Choosing a plurality of primers having various lengths provide broad priming across the target genome sequence(s) while also providing preferential binding of the primers to the target genome sequence(s) relative to the background genome 25 sequences. Selection Threshold Criteria In some embodiments, it is preferable to determine a suitable sub-set of the total unique genome sequence segments in order to reduce the total number of primers in the 30 targeted whole genome amplification set in order to reduce the costs and complexity of the primer set. In some embodiments, determination of the suitable sub-set of unique 23 WO 2011/140489 PCT/US2011/035597 genome sequence segments entails choosing one or more threshold criteria which indicate a useful and practical cut-off point for sensitivity and/or selectivity of a given genome sequence segment. Examples of such criteria include, but are not limited to, a selected threshold frequency of occurrence (a frequency of occurrence threshold value), 5 and a selected selectivity ratio (a selectivity ratio threshold value). In some embodiments, it is useful to rank the total unique genome sequence segments according to the criteria. For example, the total unique genome sequence segments are ranked according to frequency of occurrence with the #1 rank indicating the greatest frequency of occurrence and the lowest rank indicating the lowest frequency of 10 occurrence. A threshold frequency of occurrence can then be chosen from the ranks. The threshold frequency of occurrence serves as the dividing line between members of the sub-set chosen for further analysis and the members that will not be further analyzed. Design of Primers 15 The primers that are designed to hybridize to the selected genome sequence segments are preferably 100% complementary to the genome sequence segments. In other embodiments, the primers that are designed to hybridize to the selected genome sequence segments are at least about 70% to about 100% complementary to the genome sequence segments, or any whole or fractional number therebetween. In general terms, 20 design of primers for hybridization to selected nucleic acid sequences is well known to those with skill in the art and can be aided by commercially available computer programs. It is generally preferable to design a given primer such that it is the same length as the genome sequence segment which was analyzed and chosen as a primer hybridization site. However, in some cases it may be advantageous to alter the length of 25 the primer relative to the primer hybridization site. For example, if the primer is analyzed and found to have an unfavorable melting temperature and would benefit from elongation at the 5' or 3' end to produce a primer having an improved affinity for the target genome sequence. The length of the primer can be either increased or decreased. One with ordinary skill will recognize that alteration of the primer length also alters the 30 primer hybridization site so that it no longer identical to the originally selected genome sequence segment. In some cases, it may be beneficial to analyze the genome sequence 24 WO 2011/140489 PCT/US2011/035597 segment which corresponds to the hybridization site of a given length-altered primer. This analysis may be done by examination of data including but not limited to: frequency of occurrence and selectivity ratio and may also be done by actual in vitro testing of the length-altered primer. 5 In some embodiments, in cases where it may be advantageous to design a primer to be less than 100% complementary to its corresponding genome sequence segment, it is also advantageous to examine the complement of the re-calculate selection criteria (such as frequency of occurrence and selectivity ratio) for a hypothetical genome sequence segment that is 100% complementary to the primer which is less than 100% 10 complementary to its corresponding original genome sequence segment. If the selection criteria are unfavorable, it would be advantageous to consider design of an alternate primer sequence having improved selection criteria. III. Sequencing Technologies 15 As described above, embodiments of the present invention involve sequencing the DNA library that is generated with the microfluidics cards. The present invention is not limited by the the type of sequencing method employed. Exemplary sequencing methods are described below. Illustrative non-limiting examples of nucleic acid sequencing techniques include, 20 but are not limited to, chain terminator (Sanger) sequencing and dye terminator sequencing. Chain terminator sequencing uses sequence-specific termination of a DNA synthesis reaction using modified nucleotide substrates. Extension is initiated at a specific site on the template DNA by using a short radioactive, or other labeled, oligonucleotide primer complementary to the template at that region. The 25 oligonucleotide primer is extended using a DNA polymerase, standard four deoxynucleotide bases, and a low concentration of one chain terminating nucleotide, most commonly a di-deoxynucleotide. This reaction is repeated in four separate tubes with each of the bases taking turns as the di-deoxynucleotide. Limited incorporation of the chain terminating nucleotide by the DNA polymerase results in a series of related 30 DNA fragments that are terminated only at positions where that particular di deoxynucleotide is used. For each reaction tube, the fragments are size-separated by 25 WO 2011/140489 PCT/US2011/035597 electrophoresis in a slab polyacrylamide gel or a capillary tube filled with a viscous polymer. The sequence is determined by reading which lane produces a visualized mark from the labeled primer as you scan from the top of the gel to the bottom. Dye terminator sequencing alternatively labels the terminators. Complete 5 sequencing can be performed in a single reaction by labeling each of the di deoxynucleotide chain-terminators with a separate fluorescent dye, which fluoresces at a different wavelength. A set of methods referred to as "next-generation sequencing" techniques have emerged as alternatives to Sanger and dye-terminator sequencing methods (Voelkerding 10 et al., Clinical Chem., 55: 641-658, 2009; MacLean et al., Nature Rev. Microbiol., 7: 287-296; each herein incorporated by reference in their entirety). Most current methods describe the use of next-generation sequencing technology for de novo sequencing of whole genomes to determine the primary nucleic acid sequence of an organism. In addition, targeted re-sequencing (deep sequencing) allows for sensitive mutation 15 detection within a population of wild-type sequence. Some examples include recent work describing the identification of HIV drug-resistant variants as well as EGFR mutations for determining response to anti-TK therapeutic drugs. Recent publications describing the use of bar code primer sequences permit the simultaneous sequencing of multiple samples during a typical sequencing run including, for example: Margulies, M. 20 et al. "Genome Sequencing in Microfabricated High-Density Picolitre Reactors", Nature, 437, 376-80 (2005); Mikkelsen, T. et al. "Genome-Wide Maps of Chromatin State in Pluripotent and Lineage-Committed Cells", Nature, 448, 553-60 (2007); McLaughlin, S. et al. "Whole-Genome Resequencing with Short Reads: Accurate Mutation Discovery with Mate Pairs and Quality Values", ASHG Annual Meeting (2007); Shendure J. et al. 25 "Accurate Multiplex Polony Sequencing of an Evolved Bacterial Genome", Science, 309, 1728-32 (2005); Harris, T. et al. "Single-Molecule DNA Sequencing of a Viral Genome", Science, 320, 106-9 (2008); Simen, B. et al. "Prevalence of Low Abundance Drug Resistant Variants by Ultra Deep Sequencing in Chronically HIV-infected Antiretroviral (ARV) NaYve Patients and the Impact on Virologic Outcomes", 16th International HIV 30 Drug Resistance Workshop, Barbados (2007); Thomas, R. et al. "Sensitive Mutation Detection in Heterogeneous Cancer Specimens by Massively Parallel Picoliter Reactor 26 WO 2011/140489 PCT/US2011/035597 Sequencing", Nature Med., 12, 852-855 (2006); Mitsuya, Y. et al. "Minority Human Immunodeficiency Virus Type 1 Variants in Antiretroviral-Nave Persons with Reverse Transcriptase Codon 215 Revertant Mutations", J. Vir., 82, 10747-10755 (2008); Binladen, J. et al. "The Use of Coded PCR Primers Enables High-Throughput 5 Sequencing of Multiple Homolog Amplification Products by 454 Parallel Sequencing", PLoS ONE, 2, e197 (2007); and Hoffmann, C. et al. "DNA Bar Coding and Pyrosequencing to Identify Rare HIV Drug Resistance Mutations", Nuc. Acids Res., 35, e91 (2007), all of which are herein incorporated by reference. Compared to traditional Sanger sequencing, next-gen sequencing technology 10 produces large amounts of sequencing data points. A typical run can easily generate tens to hundreds of megabases per run, with a potential daily output reaching into the gigabase range. This translates to several orders of magnitude greater than a standard 96-well plate, which can generate several hundred data points in a typical multiplex run. Target amplicons that differ by as little as one nucleotide can easily be distinguished, even when 15 multiple targets from related species are present. This greatly enhances the ability to do accurate genotyping. Next-gen sequence alignment software programs used to produce consensus sequences can easily identify novel point mutations, which could result in new strains with associated drug resistance. The use of primer bar coding also allows multiplexing of different patient samples within a single sequencing run. 20 Next-generation sequencing (NGS) methods share the common feature of massively parallel, high-throughput strategies, with the goal of lower costs in comparison to older sequencing methods. NGS methods can be broadly divided into those that require template amplification and those that do not. Amplification-requiring methods include pyrosequencing commercialized by Roche as the 454 technology platforms (e.g., 25 GS 20 and GS FLX), the Solexa platform commercialized by Illumina, and the Supported Oligonucleotide Ligation and Detection (SOLiD) platform commercialized by Applied Biosystems. Non-amplification approaches, also known as single-molecule sequencing, are exemplified by the HeliScope platform commercialized by Helicos BioSciences, and emerging platforms commercialized by VisiGen and Pacific Biosciences, respectively. 30 In pyrosequencing (Voelkerding et al., Clinical Chem., 55: 641-658, 2009; MacLean et al., Nature Rev. Microbiol., 7: 287-296; U.S. Pat. No. 6,210,891; U.S. Pat. 27 WO 2011/140489 PCT/US2011/035597 No. 6,258,568; each herein incorporated by reference in its entirety), template DNA is fragmented, end-repaired, ligated to adaptors, and clonally amplified in-situ by capturing single template molecules with beads bearing oligonucleotides complementary to the adaptors. Each bead bearing a single template type is compartmentalized into a water-in 5 oil microvesicle, and the template is clonally amplified using a technique referred to as emulsion PCR. The emulsion is disrupted after amplification and beads are deposited into individual wells of a picotitre plate functioning as a flow cell during the sequencing reactions. Ordered, iterative introduction of each of the four dNTP reagents occurs in the flow cell in the presence of sequencing enzymes and luminescent reporter such as 10 luciferase. In the event that an appropriate dNTP is added to the 3' end of the sequencing primer, the resulting production of ATP causes a burst of luminescence within the well, which is recorded using a CCD camera. It is possible to achieve read lengths greater than or equal to 400 bases, and 1 x 106 sequence reads can be achieved, resulting in up to 500 million base pairs (Mb) of sequence. 15 In the Solexa/Illumina platform (Voelkerding et al., Clinical Chem., 55: 641-658, 2009; MacLean et al., Nature Rev. Microbiol., 7: 287-296; U.S. Pat. No. 6,833,246; U.S. Pat. No. 7,115,400; U.S. Pat. No. 6,969,488; each herein incorporated by reference in its entirety), sequencing data are produced in the form of shorter-length reads. In this method, single-stranded fragmented DNA is end-repaired to generate 5'-phosphorylated 20 blunt ends, followed by Klenow-mediated addition of a single A base to the 3' end of the fragments. A-addition facilitates addition of T-overhang adaptor oligonucleotides, which are subsequently used to capture the template-adaptor molecules on the surface of a flow cell that is studded with oligonucleotide anchors. The anchor is used as a PCR primer, but because of the length of the template and its proximity to other nearby anchor 25 oligonucleotides, extension by PCR results in the "arching over" of the molecule to hybridize with an adjacent anchor oligonucleotide to form a bridge structure on the surface of the flow cell. These loops of DNA are denatured and cleaved. Forward strands are then sequenced with reversible dye terminators. The sequence of incorporated nucleotides is determined by detection of post-incorporation fluorescence, with each fluor 30 and block removed prior to the next cycle of dNTP addition. Sequence read length 28 WO 2011/140489 PCT/US2011/035597 ranges from 36 nucleotides to over 50 nucleotides, with overall output exceeding 1 billion nucleotide pairs per analytical run. Sequencing nucleic acid molecules using SOLiD technology (Voelkerding et al., Clinical Chem., 55: 641-658, 2009; MacLean et al., Nature Rev. Microbiol., 7: 287-296; 5 U.S. Pat. No. 5,912,148; U.S. Pat. No. 6,130,073; each herein incorporated by reference in their entirety) also involves fragmentation of the template, ligation to oligonucleotide adaptors, attachment to beads, and clonal amplification by emulsion PCR. Following this, beads bearing template are immobilized on a derivatized surface of a glass flow-cell, and a primer complementary to the adaptor oligonucleotide is annealed. However, rather 10 than utilizing this primer for 3' extension, it is instead used to provide a 5' phosphate group for ligation to interrogation probes containing two probe-specific bases followed by 6 degenerate bases and one of four fluorescent labels. In the SOLiD system, interrogation probes have 16 possible combinations of the two bases at the 3' end of each probe, and one of four fluors at the 5' end. Fluor color and thus identity of each probe 15 corresponds to specified color-space coding schemes. Multiple rounds (usually 7) of probe annealing, ligation, and fluor detection are followed by denaturation, and then a second round of sequencing using a primer that is offset by one base relative to the initial primer. In this manner, the template sequence can be computationally re-constructed, and template bases are interrogated twice, resulting in increased accuracy. Sequence read 20 length averages 35 nucleotides, and overall output exceeds 4 billion bases per sequencing run. In certain embodiments, nanopore sequencing in employed (see, e.g., Astier et al., J Am Chem Soc. 2006 Feb 8;128(5):1705-10, herein incorporated by reference). The theory behind nanopore sequencing has to do with what occurs when the nanopore is 25 immersed in a conducting fluid and a potential (voltage) is applied across it: under these conditions a slight electric current due to conduction of ions through the nanopore can be observed, and the amount of current is exceedingly sensitive to the size of the nanopore. If DNA molecules pass (or part of the DNA molecule passes) through the nanopore, this can create a change in the magnitude of the current through the nanopore, thereby 30 allowing the sequences of the DNA molecule to be determined. The nanopore may be a 29 WO 2011/140489 PCT/US2011/035597 solid-state pore fabricated on a metal and/or nonmetal surface, or a protein-based nanopore, such as a-hemolysin (Clarke et al., Nat. Nanotech., 4, Feb 22, 2009: 265-270). HeliScope by Helicos BioSciences (Voelkerding et al., Clinical Chem., 55: 641 658, 2009; MacLean et al., Nature Rev. Microbiol., 7: 287-296; U.S. Pat. No. 7,169,560; 5 U.S. Pat. No. 7,282,337; U.S. Pat. No. 7,482,120; U.S. Pat. No. 7,501,245; U.S. Pat. No. 6,818,395; U.S. Pat. No. 6,911,345; U.S. Pat. No. 7,501,245; each herein incorporated by reference in their entirety) is the first commercialized single-molecule sequencing platform. This method does not require clonal amplification. Template DNA is fragmented and polyadenylated at the 3' end, with the final adenosine bearing a 10 fluorescent label. Denatured polyadenylated template fragments are ligated to poly(dT) oligonucleotides on the surface of a flow cell. Initial physical locations of captured template molecules are recorded by a CCD camera, and then label is cleaved and washed away. Sequencing is achieved by addition of polymerase and serial addition of fluorescently-labeled dNTP reagents. Incorporation events result in fluor signal 15 corresponding to the dNTP, and signal is captured by a CCD camera before each round of dNTP addition. Sequence read length ranges from 25-50 nucleotides, with overall output exceeding 1 billion nucleotide pairs per analytical run. Other emerging single molecule sequencing methods real-time sequencing by synthesis using a VisiGen platform (Voelkerding et al., Clinical Chem., 55: 641-658, 2009; U.S. Pat. No. 7,329,492; U.S. 20 Pat. App. Ser. No. 11/671956; U.S. Pat. App. Ser. No. 11/ 781166; each herein incorporated by reference in their entirety) in which immobilized, primed DNA template is subjected to strand extension using a fluorescently-modified polymerase and florescent acceptor molecules, resulting in detectible fluorescence resonance energy transfer (FRET) upon nucleotide addition. Another real-time single molecule sequencing system 25 developed by Pacific Biosciences (Voelkerding et al., Clinical Chem., 55: 641-658, 2009; MacLean et al., Nature Rev. Microbiol., 7: 287-296; U.S. Pat. No. 7,170,050; U.S. Pat. No. 7,302,146; U.S. Pat. No. 7,313,308; U.S. Pat. No. 7,476,503; all of which are herein incorporated by reference) utilizes reaction wells 50-100 nm in diameter and encompassing a reaction volume of approximately 20 zeptoliters (10 x 10-21 L). 30 Sequencing reactions are performed using immobilized template, modified phi29 DNA polymerase, and high local concentrations of fluorescently labeled dNTPs. High local 30 WO 2011/140489 PCT/US2011/035597 concentrations and continuous reaction conditions allow incorporation events to be captured in real time by fluor signal detection using laser excitation, an optical waveguide, and a CCD camera. In certain embodiments, the single molecule real time (SMRT) DNA sequencing 5 methods using zero-mode waveguides (ZMWs) developed by Pacific Biosciences, or similar methods, are employed. With this technology, DNA sequencing is performed on SMRT chips, each containing thousands of zero-mode waveguides (ZMWs). A ZMW is a hole, tens of nanometers in diameter, fabricated in a 100nm metal film deposited on a silicon dioxide substrate. Each ZMW becomes a nanophotonic visualization chamber 10 providing a detection volume of just 20 zeptoliters (10-21 liters). At this volume, the activity of a single molecule can be detected amongst a background of thousands of labeled nucleotides. The ZMW provides a window for watching DNA polymerase as it performs sequencing by synthesis. Within each chamber, a single DNA polymerase molecule is 15 attached to the bottom surface such that it permanently resides within the detection volume. Phospholinked nucleotides, each type labeled with a different colored fluorophore, are then introduced into the reaction solution at high concentrations which promote enzyme speed, accuracy, and processivity. Due to the small size of the ZMW, even at these high, biologically relevant concentrations, the detection volume is occupied 20 by nucleotides only a small fraction of the time. In addition, visits to the detection volume are fast, lasting only a few microseconds, due to the very small distance that diffusion has to carry the nucleotides. The result is a very low background. As the DNA polymerase incorporates complementary nucleotides, each base is held within the detection volume for tens of milliseconds, which is orders of magnitude 25 longer than the amount of time it takes a nucleotide to diffuse in and out of the detection volume. During this time, the engaged fluorophore emits fluorescent light whose color corresponds to the base identity. Then, as part of the natural incorporation cycle, the polymerase cleaves the bond holding the fluorophore in place and the dye diffuses out of the detection volume. Following incorporation, the signal immediately returns to 30 baseline and the process repeats. 31 WO 2011/140489 PCT/US2011/035597 Unhampered and uninterrupted, the DNA polymerase continues incorporating bases at a speed of tens per second. In this way, a completely natural long chain of DNA is produced in minutes. Simultaneous and continuous detection occurs across all of the thousands of ZMWs on the SMRT chip in real time. Researchers at PacBio have 5 demonstrated this approach has the capability to produce reads thousands of nucleotides in length. EXAMPLES The following Examples are presented in order to provide certain exemplary 10 embodiments of the present invention and are not intended to limit the scope thereof. EXAMPLE 1 Stabilized Enzyme Mixtures This example describes the development of stabilized enzyme mixtures that are 15 useful in methods such as whole genome amplification (WGA). As described in Figure 15, many excipient formulations were tested for compatibility with the WGA of Phi-29, Polymerase I, and inorganic pyrophosphatase. It was found that 16 proprietary stabilization formulations (called excipients) were not useful at successfully stabilizing the enzymes generally used in WGA. It was found that BSA was an important 20 component for stabilizing these enzymes, as shown in Figure 16. One preferred excipient that was developed is called "Ibis Formula 33." A description of how to make this formulation is as follows. A mixture of 8968 u/ml Phi 29 polymerase (Monserate), 180 u/ml Polymerase I (Epicentre Biotechnologies), 3.6 u/ml Inorganic Pyrophosphatase (U.S. Biochemical) is mixed 1:1 with a solution containing 25 20% trehalose, 10 mM (NH 4

)

2

SO

4 , 12 MgCl 2 , 50 mM Tris pH 7.6, 0.05% Tween 40, 4mM DTT and BSA at a level to achieve a final concentration of 0.25% (due to volume changes during dialysis there is a higher concentration of BSA during dialysis so that the solution can be brought up to the correct final volume post-dialysis.) This mixture is dialyzed using a 30 KDa dialysis membrane into a solution containing 20% trehalose, 10 30 mM (NH 4

)

2

SO

4 , 12 MgCl 2 , 50 mM Tris pH 7.6, 0.05% Tween 40 and 4mM DTT for 4 hours at room temperature. 32 WO 2011/140489 PCT/US2011/035597 The dialyzed enzyme mixture is then removed from the dialysis membrane and brought up to the correct final volume (the level of dilution during the dialysis/dilution process controls how much enzyme is present per lyophilized unit) using a solution containing 20% trehalose, 10 mM (NH 4

)

2

SO

4 , 12 MgCl 2 , 50 mM Tris pH 7.6, 0.05% 5 Tween 40 and 4mM DTT. This solution is then aliquoted into appropriate volumes, frozen and subjected to a high vacuum to remove the water via sublimation to generate a lypilized composition. A number of BSA levels (0.13 %-1% final concentration) as well as the addition of 0.5% (final concentration) of PEG-8000 were tested using the same general scheme 10 described above. The results of this testing are shown in Figure 17. Using the excipients developed in this work we successfully demonstrated that the the enzymatic activity of all three of these enzymes is maintained during lyophilization and the stability of these enzymes was dramatically increased from less than 10 days at room temperature (-25 C) to more than 2 months at 40 C. This formulation also increases 15 the total reaction yield when compared to a fresh (i.e., stored in a -20 C freezer until use) enzyme mix. Long-term stability results for storage at room temperature are shown in Figure 18. This figures shows that the lyophilized enzymes in Ibis Formula 33 when stored at room temperature for 4 months performed equal to fresh enzyme. Figure 19 shows long-term storage stability using accelerated aging of 40 degrees Celsius for two 20 months, which is equal to approximately 6 months of room temperature storage. Figure 19 shows that the lyophilized enzymes in Ibis Formula 33 performed equal to fresh enzyme after two months at 40 degrees Celsius. EXAMPLE 2 25 Sample Preparation Methods This example describes various sample preparation methods that may be used, for example, in microfluidic devices. Such methods allows the use of a single universal buffer and make it possible for the sample to remain in single tube. The general outline for such methods include the following steps: lysis and extraction; whole-genome 30 amplification (or other amplification method); fragmentation of DNA; end polishing; 33 WO 2011/140489 PCT/US2011/035597 ligation; removal of incomplete products; and final clean-up. Described below are certain details on a number of such steps. i. Exemplary Fragmentation Methods 5 An amplified sample (e.g., WGA sample) can be fragmented with a device composed of the following components: 1) sonicator assembly: 2.4 meghaertz miniature ultrasonic nebulizer, Sonaer 241V; 2) Transducer: gold coated nebulizer crystal, Sonaer 24AU; 3) Power supply: 24 volt power supply, Sonaer ST624; and 4) Lid: machined plastic to create enclosure in sonicator assembly. Sonication using this method can be 10 conducted for 10 minutes total time, with 50% duty cycle with intervals of 15s on, 15s off. ii. Ligation Reaction Speed Optimized The speed of the ligation was optimized from an initial condition, which allowed 15 a significant increase in the amount of final product generated in 30 minutes. The optimization included modified buffer components or concentrations and modified enzyme concentrations. The parameters are shown in Table 1 below. The reactions conditions were 30 C, 30 minutes, and 65 C, 10 minutes. Table 1 Tween T4 Ligase trehalose (NH4)2SO4 Tris MgCl2 40 DTT condition 4525 40 2.81 1 3,000 units mM 8 mM mM 9.6 mM 1% mM 10,000 4525 40 2.81 optimized units mM 8 mM mM 9.6 mM 1% mM dNTPs WGA (each) ATP PEG 8000 pH Hairpin Insert Primers condition 4.36 0.436 1 518uM 3mM 0 7.6 uM uM 35.8uM optimized 518 uM 3 34 u IM 4.55% 7.6 4.36 0.436 35.8 uM 34 WO 2011/140489 PCT/US2011/035597 uM uM Important parameters for optimization included: ligase concentration, ATP concentration, PEG concentration, addition of sodium pyrophosphate after 1 minute of reaction. The optimized conditions lead to a significant increase in final product after 30 minutes. 5 iii. WGA Enzymes in Amph'fication Buffer End Polish Efficiently Conditions were examined to test end polishing efficiency. Conditions tested included: reaction time, reaction temperature, dATP concentration, DTT concentration, PEG concentration, sperimidine concentration, poly-lysine concentration. The 10 parameters employed are shown in Table 2 below. The reaction conditions employed were: 37 C, 5 minutes; 50 C, 2 minutes; and 75 C, 10 minutes. TABLE 2 Phi 29 Klenow exo- trehalose (NH4)2SO4 Tris MgCl2 Tween 40 end polish 100 units 40 units 452 5 mM 8 mM 40 mM 9.6 mM 1% dNTPs WGA Duplex DTT (each) dATP pH Primers Oligo end polish 2.81 mM 518 uM 5 mM 7.6 35.8 uM 1 uM 15 The analysis method employed was electro-spray ionization time of flight mass spectrometry (ESI-TOF MS). One important parameter fond was reaction temperature (this was an important parameter as below 55C minimal A-tailing was observed while above 55 C significant A-tailing was observed), dATP concentration (increasing the dATP concentration increases A-tailing). The results found that 100% of the products 20 were blunted appropriately, and approximately 70% of the ends were A-tailed. 35 WO 2011/140489 PCT/US2011/035597 iv. Exonuclease Clean-Up ofLigation Reactions A ligation reaction performed using 'condition 1' shown in Table 1 above (with a slightly different hairpin/insert sequences) digested using exo III and exo VII. The hairpin and insert concentration shown below are prior to the ligation reaction. The 5 majority of the insert was converted to "final product" during the ligation reaction. The conditions used are shown in Table 3. The reactions conditions were 37 C, 1 hr, and 70 C, 10 minutes. TABLE 3 Tween Exo III Exo VII trehalose (NH4)2SO4 Tris MgCl2 40 exo 4525 digest 100 units 5 units mM 8 mM 40 mM 9.6 mM 1% dNTPs WGA DTT (each) pH Hairpin Insert Primers exo 0.436 digest 2.81 mM 518 uM 7.6 4.36 uM uM 35.8 uM 10 It is noted that WGA amplification primers were included in all these reactions even though they are not part of the reaction to determine if they would cause any inhibition (none was observed.) Similarly, dNTPs were included in reactions (such as the ligation or exo digestion) even though they were not needed in the reaction to determine 15 if they would cause any inhibition (none was observed.) The exonuclease degrades non circularized templates, removing any DNA other than final product. All publications and patents mentioned in the present application are herein incorporated by reference. Various modification and variation of the described methods 20 and compositions of the invention will be apparent to those skilled in the art without departing from the scope and spirit of the invention. Although the invention has been described in connection with specific preferred embodiments, it should be understood 36 WO 2011/140489 PCT/US2011/035597 that the invention as claimed should not be unduly limited to such specific embodiments. Indeed, various modifications of the described modes for carrying out the invention that are obvious to those skilled in the relevant fields are intended to be within the scope of the following claims. 5 37

Claims (22)

1. A microfluidic card comprising: a) a loading port configured for introduction of a biological sample; 5 b) one or more of the following components: i) a waste chamber; ii) a lysis sub-circuit operably linked to said loading port, wherein said cell lysis sub-circuit comprises: i) a mixing chamber and, ii) a first sealed package containing lysis buffer; wherein said lysis sub-circuit is configured to 10 lyse said biological sample in said mixing chamber with said lysis buffer to generate a lysed sample; iii) a nucleic acid extraction sub-circuit operably linked to both said lysis sub-circuit and said waste chamber, wherein said nucleic acid extraction sub circuit comprises: 1) a nucleic acid extraction component configured to bind 15 nucleic acids present in said lysed sample, 2) a second sealed package containing wash buffer, 3) a third sealed package containing elution buffer, and 4) a pump component configured for pumping said elution buffer over said nucleic acid extraction component to generate a mixture of extracted nucleic acids; iv) an amplification sub-circuit operably linked to said nucleic acid 20 extraction sub-circuit, wherein said amplification sub-circuit comprises a stabilized enzyme mixture, wherein said stabilized enzyme mixture comprises at least one amplification-related enzyme useful for performing amplification on said extracted nucleic acid to generate amplified nucleic acid; c) a fragmentation sub-circuit operably linked to said amplification sub 25 circuit, wherein said fragmentation sub-circuit comprises: i) a reagent mixture configured for digesting said amplified nucleic acid to generate fragmented nucleic acid, and/or ii) a fragmentation component configured for mechanically fragmenting said amplified nucleic acid to generate fragmented nucleic acid; and d) a linker ligation sub-circuit operably linked to said fragmentation sub 30 circuit, wherein said linker ligation sub-circuit comprises: i) nucleic acid linkers configured for use in sequencing methods, and ii) a ligation enzyme mixture configured 38 WO 2011/140489 PCT/US2011/035597 for ligating said nucleic acid linkers to said fragmented nucleic acid to generate a nucleic acid sequencing library.

2. The microfluidic card of Claim 1, wherein said at least one amplification-related 5 enzyme comprises an enzyme useful for performing whole genome amplification (WGA), PCR, or TMA.

3. The microfluidics card of Claim 1, wherein said at least one amplification-related enzyme is selected from the group consisting of: Phi-29 polymerase, E. coli DNA 10 polymerase I, inorganic pyrophosphatase, or any combination thereof.

4. The microfluidics card of Claim 1, wherein said stabilized enzyme mixture further comprises: i) BSA, ii) a sugar, and iii) at least one additional component selected from the group consisting of: an inorganic salt, a divalent metal cation, a buffering agent, an 15 emulsifier, and a reducing agent.

5. The microfluidics card of Claim 1, wherein said stabilized enzyme mixture further comprises: i) BSA, ii) a sugar, iii) an inorganic salt, iv) a divalent metal cation, v) a buffering agent, vi) an emulsifier, vii) and a reducing agent. 20

6. The microfluidic card of Claim 1, further comprising: e) a purification sub-circuit operably linked to said linker ligation component, wherein said purification sub-circuit comprises a nucleic acid purification component, wherein said nucleic acid purification component comprises anchored nucleic acid sequences configured to hybridize to said 25 linkers on said nucleic acid sequencing library.

7. The microfluidic card of Claim 1, further comprising an outlet port configured to allow a user to withdraw at least a portion of said nucleic acid sequencing library. 39 WO 2011/140489 PCT/US2011/035597

8. The microfluidic card of Claim 1, wherein said fragmentation sub-circuit further comprises: at least one type of enzyme configured for polishing the ends of said fragmented nucleic acid. 5

9. The microfluidic card of Claim 1, wherein said linker ligation sub-circuit further comprises: at least one type of enzyme configured for polishing the ends of said nucleic acid sequencing library.

10. A stabilized enzyme mixture comprising: 10 a) at least one type of enzyme; b) bovine serum albumin (BSA); c) a sugar; d) an inorganic salt; e) a divalent metal cation; 15 f) a buffering agent; g) an emulsifier; and h) a reducing agent.

11. The stabilized enzyme mixture of Claim 10, further comprising polyethylene 20 glycol (PEG).

12. The stabilized enzyme mixture of Claim 10, wherein said stabilize enzyme mixture is in an lyophilized form. 25

13. The stabilized enzyme mixture of Claim 10, wherein said BSA is present at a concentration of 0.05% - 3.0% in said stabilized enzyme mixture.

14. The stabilized enzyme mixture of Claim 10, wherein said sugar is present at a concentration of 5-35% of said stabilized enzyme mixture. 30 40 WO 2011/140489 PCT/US2011/035597

15. The stabilized enzyme mixture of Claim 10, wherein said sugar is a non-reducing sugar.

16. The stabilized enzyme mixture of Claim 10, wherein said at least one type of 5 enzyme comprises a polymerase.

17. The stabilized enzyme mixture of Claim 10, wherein said at least one type of enzyme comprises an inorganic pyrophosphatase. 10

18. The stabilized enzyme mixture of Claim 10, wherein said inorganic salt is present at a concentration of 1 mM - 25 mM in said stabilized enzyme mixture.

19. The stabilized enzyme mixture of Claim 10, wherein divalent metal cation is present at a concentration of 1 mM - 30 mM in said stabilized enzyme mixture. 15

20. The stabilized enzyme mixture of Claim 10, wherein said buffering agent is present at a concentration of 10 mM - 100 mM.

21. The stabilized enzyme mixture of Claim 10, wherein said emulsifier is present at a 20 concentration of 0.01% - 0.15% in said stabilized enzyme mixture.

22. The stabilized enzyme mixture of Claim 10, wherein said reducing agent is present at a concentration of 1 mM - 10 mM. 25 41