Abstract
Psychotic symptoms, defined as the occurrence of delusions or hallucinations, are frequent in Alzheimer disease (AD with psychosis, AD + P). AD + P affects ~50% of individuals with AD, identifies a subgroup with poor outcomes, and is associated with a greater degree of cognitive impairment and depressive symptoms, compared to subjects without psychosis (AD − P). Although the estimated heritability of AD + P is 61%, genetic sources of risk are unknown. We report a genome-wide meta-analysis of 12,317 AD subjects, 5445 AD + P. Results showed common genetic variation accounted for a significant portion of heritability. Two loci, one in ENPP6 (rs9994623, O.R. (95%CI) 1.16 (1.10, 1.22), p = 1.26 × 10−8) and one spanning the 3′-UTR of an alternatively spliced transcript of SUMF1 (rs201109606, O.R. 0.65 (0.56–0.76), p = 3.24 × 10−8), had genome-wide significant associations with AD + P. Gene-based analysis identified a significant association with APOE, due to the APOE risk haplotype ε4. AD + P demonstrated negative genetic correlations with cognitive and educational attainment and positive genetic correlation with depressive symptoms. We previously observed a negative genetic correlation with schizophrenia; instead, we now found a stronger negative correlation with the related phenotype of bipolar disorder. Analysis of polygenic risk scores supported this genetic correlation and documented a positive genetic correlation with risk variation for AD, beyond the effect of ε4. We also document a small set of SNPs likely to affect risk for AD + P and AD or schizophrenia. These findings provide the first unbiased identification of the association of psychosis in AD with common genetic variation and provide insights into its genetic architecture.
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Acknowledgements
This study was supported by the following federal grants: AG027224 (RAS), MH116046 (RAS), MH057881 (BD), AG030653 (MIK), AG041718 (MIK), AG066468 (OLL). Authors in the NIA-LOAD Family Based Study Consortium are Tatiana Foroud, M. Ilyas Kamboh, Oscar L. Lopez, and Richard Mayeux. Authors in the Alzheimer’s Disease Genetics Consortium (ADGC) are Tatiana Foroud, Richard Mayeux, and Robert A. Sweet. A complete list of contributing individuals, consortia, and their grant support can be found in Supplementary Acknowledgements.
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Each author is expected to have made substantial contributions: (1) to the conception or design of the work; RAS, BD, MIK, CB, OLL. (2) to the acquisition, analysis, or interpretation of data; MAAD-S, LK, BC, JCH, EAW, LM, RS, IH, SM-G, LT, MB, EA-M, SV, YL, BH, DA, GS, SB, AR, IS, HKS, BE, ES, OAA, SD, LA, DS, BB, DA, GF, PM, AS, DDR, AP, JW, RM, TF, AR, CB, PH, OLL, MIK, BD, RAS. (3) to the creation of new software used in the work; YL. (4) have drafted the manuscript or substantively revised it. MAAD-S, JCH, LK, BC, LM, CB, PH, MIK, BD, RAS. Each author has approved the submitted version (and any substantially modified version that involves the author’s contribution to the study) and has agreed both to be personally accountable for the author’s own contributions and to ensure that questions related to the accuracy or integrity of any part of the work, even ones in which the author was not personally involved, are appropriately investigated, resolved, and the resolution documented in the literature.
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YL and BH are currently employed by and holding stock in Eli Lilly and Company. CB reports grants and personal fees from Acadia pharmaceutical company, grants and personal fees from Lundbeck, personal fees from Roche, personal fees from Otsuka, personal fees from Biogen, personal fees from Eli Lilly, personal fees from Novo Nordisk, personal fees from AARP, grants and personal fees from Synexus, personal fees from Exciva, outside the submitted work. OLL served as a consultant for Grifols, Inc. IS has been investigator in the drug trial Boehringer‐Ingelheim 1346.0023. OAA is a consultant to HEALTHLYTIX, speaker honoraria from Lundbeck. AS is or has been a consultant to or has received honoraria or grants unrelated to the present work from: Abbott, Abbvie, Angelini, Astra Zeneca, Clinical Data, Boheringer, Bristol Myers Squibb, Eli Lilly, GlaxoSmithKline, Innovapharma, Italfarmaco, Janssen, Lundbeck, Naurex, Pfizer, Polifarma, Sanofi, Servier. MB is a consultant to GRIFOLS, BIOGEN, ROCHE, LILLY, CORTEXYME, ARACLON, MERCK. Grants La Caixa, IMI, ISCIII. DS reports personal fees from Biogen.
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Members of the NIA-LOAD Family Based Study Consortium and Alzheimer’s Disease Genetics Consortium (ADGC) are listed in Supplementary information.
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DeMichele-Sweet, M.A.A., Klei, L., Creese, B. et al. Genome-wide association identifies the first risk loci for psychosis in Alzheimer disease. Mol Psychiatry 26, 5797–5811 (2021). https://doi.org/10.1038/s41380-021-01152-8
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DOI: https://doi.org/10.1038/s41380-021-01152-8
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