Cited by 84Genetic Associations and EpidemiologyAlzheimer's disease research and treatmentsDementia and Cognitive Impairment Research

Shared genetic etiology underlying Alzheimer’s disease and type 2 diabetes

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Hao, Ke, Di Narzo, Antonio Fabio, Ho, Lap, Luo, Wei, Li, Shuyu, Chen, Rong, Li, Tongbin, Dubner, Lauren +1 more·2015·Molecular Aspects of Medicine

Abstract

Epidemiological evidence supports the observation that subjects with type 2 diabetes (T2D) are at higher risk to develop Alzheimer's disease (AD). However, whether and how these two conditions are causally linked is unknown. Possible mechanisms include shared genetic risk factors, which were investigated in this study based on recent genome wide association study (GWAS) findings. In order to achieve our goal, we retrieved single nucleotide polymorphisms (SNPs) associated with T2D and AD from large-scale GWAS meta-analysis consortia and tested for overlap among the T2D- and AD-associated SNPs at various p-value thresholds. We then explored the function of the shared T2D/AD GWAS SNPs by leveraging expressional quantitative trait loci, pathways, gene ontology data, and co-expression networks. We found 927 SNPs associated with both AD and T2D with p-value ≤0.01, an overlap significantly larger than random chance (overlapping p-value of 6.93E-28). Among these, 395 of the shared GWAS SNPs have the same risk allele for AD and T2D, suggesting common pathogenic mechanisms underlying the development of both AD and T2D. Genes influenced by shared T2D/AD SNPs with the same risk allele were first identified using a SNP annotation variation (ANNOVAR) software, followed by using Association Protein-Protein Link Evaluator (DAPPLE) software to identify additional proteins that are known to physically interact with the ANNOVAR gene annotations. We found that gene annotations from ANNOVAR and DAPPLE significantly enriched specific KEGG pathways pertaining to immune responses, cell signaling and neuronal plasticity, cellular processes in which abnormalities are known to contribute to both T2D and AD pathogenesis. Thus, our observation suggests that among T2D subjects with common genetic predispositions (e.g., SNPs with consistent risk alleles for T2D and AD), dysregulation of these pathogenic pathways could contribute to the elevated risks for AD in subjects. Interestingly, we found that 532 of the shared T2D/AD GWAS SNPs had divergent risk alleles in the two diseases. For individual shared T2D/AD SNPs with divergent alleles, one of the allelic forms may contribute to one of the diseases (e.g., T2D), but not necessarily to the other (e.g., AD), or vice versa. Collectively, our GWAS studies tentatively support the epidemiological observation of disease concordance between T2D and AD. Moreover, the studies provide the much needed information for the design of future novel therapeutic approaches, for a subpopulation of T2D subjects with genetic disposition to AD, that could benefit T2D and reduce the risk for subsequent development of AD.

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  • Overlap in the genetic architecture between AD and other diseases has been reported, including type 2 diabetes and immune-mediated diseases such as Crohn's disease.

    “Overlap in the genetic architecture between AD and other diseases has also been reported, including type 2 diabetes [124] and immune-mediated diseases such as Crohn’s disease [125, 126], although the precise mechanisms underlying this overlap remain to be elucidated.”

    From Genetic architecture of Alzheimer's disease (2020) · cites this paper as [124]

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Authors
Hao, K., Di Narzo, A. F., Ho, L., Luo, W., Li, S., Chen, R., Li, T., Dubner, L., & Pasinetti, G. M.
Affiliations
  • Icahn School of Medicine at Mount Sinai (US)
  • Huaqiao University (CN)
  • James J. Peters VA Medical Center (US)
Corresponding author
Pasinetti, Giulio Maria
Venue
Molecular Aspects of Medicine
Publisher
Elsevier BV
Published
2015-06
Volume
43-44
Pages
66-76
ISSN
0098-2997 (ISSN-L)
OpenAlex
W1122992935
Cited by
84
References
46
Citations by year
2026: 6 · 2025: 6 · 2024: 5 · 2023: 5 · 2022: 13 · 2021: 8 · 2020: 10 · 2019: 8 · 2018: 4 · 2017: 9 · 2016: 5 · 2015: 5
FWCI
0.98
Type
journal article
Language
en
Open access
Locations
  • Molecular Aspects of Medicine (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • Icahn School of Medicine at Mount Sinai
  • Altschul Foundation
  • National Natural Science Foundation of China (21477087)
  • CADgenomics (#0266-2493)
  • Fujian Province Overseas Studying Fellowship
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetic Associations and Epidemiology
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Health Sciences › Medicine › Psychiatry and Mental health › Dementia and Cognitive Impairment Research
Keywords
Alzheimer's disease, type 2 diabetes, shared genetic risk, single nucleotide polymorphisms, genetic overlap, risk alleles, immune response, signal transduction, neuroplasticity, protein-protein interaction, co-expression network, KEGG pathways, Gene Ontology, ANNOVAR, shared pathogenesis
MeSH terms
Alzheimer Disease, Diabetes Mellitus, Type 2, Humans, Genetic Predisposition to Disease, Polymorphism, Single Nucleotide, Genome-Wide Association Study

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