PR Nar 100507 0 PDF
PR Nar 100507 0 PDF
PR Nar 100507 0 PDF
the homing endonuclease I-CreI is essential for site recognition, DNA binding
and cleavage in the journal Nucleic Acids Research
This publication testifies to Cellectis ongoing efforts to maintain its leadership in
meganuclease engineering
Romainville, France, May 10th 2007 - Cellectis SA, the rational genome engineering
company specializing in the production of meganuclease recombination systems and in
meganuclease engineering, today announced the publication of a new paper in the high
profile journal Nucleic Acids Research (Prieto et al.,) "The C-terminal loop of the homing
endonuclease I-CreI is essential for site recognition, DNA binding and cleavage". Nucleic
Acids Research, 2007, 110 doi:10.1093/nar/gkm183 Apr 22 2007
(http://nar.oxfordjournals.org/) as a result of its collaborative research effort with the NMR
and Macromolecular Crystallography Groups at the Centro Nacional de Investigationes
Oncologicas (CNIO), a world-class research institute located in Madrid (Spain).
Over the last decade, meganucleases have emerged as powerful tools for efficient and
precise genome engineering. This technology is a world standard in gene targeting and is
used to precisely substitute, delete, add or correct genetic sequences at a chosen location in
any given genome. Meganuclease Recombination Systems address a wide range of
applications spanning the fields of agricultural biotechnology, protein production and genomic
research tools. However, meganucleases also provide new hope for novel therapeutic agents
for curing monogenic inherited diseases and viral infections. The meganuclease technology
as such and some of the principle of the uses of homologous recombination were discovered
at the Institut Pasteur, which then granted Cellectis worldwide exclusive rights in 2000.
Since then, Cellectis has expanded the potential of this technology by developing
meganucleases with tailored specificities which are thus able to target selected genes in any
given organism. This achievement was the result of a sustained long-term R&D effort with the
development of a dedicated high-throughput screening (HTS) platform. Another key factor
was the acquisition of specific knowledge of the intrinsic biochemical and biophysical
properties of meganucleases, resulting either from in-house research at Cellectis or via
collaboration with academic institutions such as the CNIO in Madrid.
The challenge of any genome engineering technology based on the induction of specific DNA
cuts relies on two critical characteristics of the DNA cutter: its activity and its specificity (in
order to avoid side effects). Hence, assessment of the quality and the safety of a DNA cutter
is based on these two parameters. The discovery made by the Groups of F. Blanco and G.
Montoya, from CNIO, and Cellectis in this collaborative study opens up new routes for the
engineering of highly active and specific tailor-made meganucleases.
About Cellectis
Human health
- Many genetic diseases result from a single mutation in a specific gene. Meganucleases
can specifically target this same gene. In parallel, a DNA repair matrix (prepared by
Cellectis and including a non-mutated copy of this gene) will be introduced into the cell.
Upon cleavage by the meganuclease, the repair matrix will be used as a template to
restore a correct gene. By erasing the mutation, gene correction addresses the very
cause of the disease, rather than its consequences
Agrobiotech
- The process described above in human health can also be applied to plants, with the
objective of replacing one gene by another, modifying a gene or shutting a gene down.
The applications developed by multinational firms (such as Bayer BioSciences and
DuPont-Pioneer) using Cellectis technology are essentially aimed at improving
agronomic features of crops.
Biomanufacturing
- Biomanufacturing is a multibillion market with an annual growth rate of over 15%. It
consists in the production of therapeutic proteins and antibodies using bacteria, yeasts or
mammalian cells (mainly mouse, hamster and human cells). Cellectis has developed
meganucleases that cut the DNA of the principal production cell lines used in
biomanufacturing, thus enabling end users (contract manufacturing organizations or
biopharmaceutical companies) to shorten their cell line engineering processes, stabilize
production yields (and thus the quality of the final product) and improve final product
features.
About Cellectis R&D and publication policy
To deliver efficient genome engineering tools, Cellectis has focused its R&D activity on two
major axes. First, Cellectis develops custom meganucleases with tailored specificity, capable
of cleaving an a priori selected gene. This protein engineering process is based on the latest
HTS methods, Cellectis' in-depth knowledge of the meganucleases' properties (how they
bind and cleave DNA, their intrinsic plasticity, etc.) and our ability to potentially modify these
properties. The second axis corresponds to optimization of the repair process, which largely
depends on the design of the repair matrix.
Cellectis policy is to foster research excellence in order to offer new solutions for genome
engineering. To date, the major outcome of this effort has been the production of custom
meganucleases that cleave genes of interest; this capability vastly expands the range of
potential applications and is a prerequisite for therapeutic use. While the core activity (i.e. the
protein engineering itself) is usually conducted solely by Cellectis, upstream studies are often
performed in collaboration with major players in the field.
This effort has resulted in a growing body of know-how, of which part has been disclosed
(after IP protection) in peer-reviewed journals in order to disseminate the company's
achievements to a broad scientific audience. The publications listed below testify to Cellectis'
technical progress and its recognition by the scientific community.
For a discussion of risks and uncertainties which could cause actual results, financial
condition, performance or achievements of Cellectis SA to differ from those contained in the
forward-looking statements please refer to the Risk Factors (Facteurs de Risque) section of
the prospectus approved by the French Autorit des Marchs Financiers (AMF) on January
22nd, 2007 under visa number 07-023, available on the websites of the AMF
(http://www.amf-france.org) and Cellectis (http://www.cellectis.com).
Disclaimer
This press release, and the information contained herein, does not constitute an offer to sell
or a solicitation of an offer to buy or subscribe for shares in Cellectis in any country.