Cited by 114Alzheimer's disease research and treatmentsDementia and Cognitive Impairment ResearchNeuroinflammation and Neurodegeneration Mechanisms

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ABI3 and PLCG2 missense variants as risk factors for neurodegenerative diseases in Caucasians and African Americans

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Abstract

BACKGROUND: Rare coding variants ABI3_rs616338-T and PLCG2_rs72824905-G were identified as risk or protective factors, respectively, for Alzheimer's disease (AD). METHODS: We tested the association of these variants with five neurodegenerative diseases in Caucasian case-control cohorts: 2742 AD, 231 progressive supranuclear palsy (PSP), 838 Parkinson's disease (PD), 306 dementia with Lewy bodies (DLB) and 150 multiple system atrophy (MSA) vs. 3351 controls; and in an African-American AD case-control cohort (181 AD, 331 controls). 1479 AD and 1491 controls were non-overlapping with a prior report. RESULTS: Using Fisher's exact test, there was significant association of both ABI3_rs616338-T (OR = 1.41, p = 0.044) and PLCG2_rs72824905-G (OR = 0.56, p = 0.008) with AD. These OR estimates were maintained in the non-overlapping replication AD-control analysis, albeit at reduced significance (ABI3_rs616338-T OR = 1.44, p = 0.12; PLCG2_rs72824905-G OR = 0.66, p = 0.19). None of the other cohorts showed significant associations that were concordant with those for AD, although the DLB cohort had suggestive findings (Fisher's test: ABI3_rs616338-T OR = 1.79, p = 0.097; PLCG2_rs72824905-G OR = 0.32, p = 0.124). PLCG2_rs72824905-G showed suggestive association with pathologically-confirmed MSA (OR = 2.39, p = 0.050) and PSP (OR = 1.97, p = 0.061), although in the opposite direction of that for AD. We assessed RNA sequencing data from 238 temporal cortex (TCX) and 224 cerebellum (CER) samples from AD, PSP and control patients and identified co-expression networks, enriched in microglial genes and immune response GO terms, and which harbor PLCG2 and/or ABI3. These networks had higher expression in AD, but not in PSP TCX, compared to controls. This expression association did not survive adjustment for brain cell type population changes. CONCLUSIONS: We validated the associations previously reported with ABI3_rs616338-T and PLCG2_rs72824905-G in a Caucasian AD case-control cohort, and observed a similar direction of effect in DLB. Conversely, PLCG2_rs72824905-G showed suggestive associations with PSP and MSA in the opposite direction. We identified microglial gene-enriched co-expression networks with significantly higher levels in AD TCX, but not in PSP, a primary tauopathy. This co-expression network association appears to be driven by microglial cell population changes in a brain region affected by AD pathology. Although these findings require replication in larger cohorts, they suggest distinct effects of the microglial genes, ABI3 and PLCG2 in neurodegenerative diseases that harbor significant vs. low/no amyloid ß pathology.

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Fig. 1 Forest plots of associations: Forest plots for Fisher’s exact test association results in each disease cohort with a. ABI3 (rs616338) and b. PLCG2 (rs72824905). ORs (diamonds) and 95% CI (whiskers) are plotted for each disease cohort and shown numerically on the right of each plot. Abbreviations: AD = Alzheimer’s disease; PSP = progressive supranuclear palsy; PD = Parkinson’s disease; DLB = dementia with Lewy bodies; MSA = multiple system atrophy
Fig. 1 Forest plots of associations: Forest plots for Fisher’s exact test association results in each disease cohort with a. ABI3 (rs616338) and b. PLCG2 (rs72824905). ORs (diamonds) and 95% CI (whiskers) are plotted for each disease cohort and shown numerically on the right of each plot. Abbreviations: AD = Alzheimer’s disease; PSP = progressive supranuclear palsy; PD = Parkinson’s disease; DLB = dementia with Lewy bodies; MSA = multiple system atrophyCC BY · PubMed Central

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Metadata

Authors
Conway, O. J., Carrasquillo, M. M., Wang, X., Bredenberg, J. M., Reddy, J. S., Strickland, S. L., Younkin, C. S., Burgess, J. D., Allen, M., Lincoln, S. J., Nguyen, T., Malphrus, K. G., Soto, A. I., Walton, R. L., Boeve, B. F., Petersen, R. C., Lucas, J. A., Ferman, T. J., Cheshire, W. P., van Gerpen, J. A., Uitti, R. J., Wszolek, Z. K., Ross, O. A., Dickson, D. W., Graff-Radford, N. R., & Ertekin-Taner, N.
Affiliations
  • Mayo Clinic in Florida (US)
  • Mayo Clinic (US)
Venue
Molecular Neurodegeneration
Published
2018-10-11
Volume
13
Issue
1
Pages
53-53
ISSN
1750-1326 (ISSN-L)
OpenAlex
W2896393831
Cited by
112
References
57
Citations by year
2026: 8 · 2025: 8 · 2024: 13 · 2023: 12 · 2022: 28 · 2021: 17 · 2020: 20 · 2019: 4 · 2018: 2
FWCI
7.39
Type
journal article
Language
en
Open access
Locations
  • Molecular Neurodegeneration (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
  • National Institute on Aging (RF AG051504, U01 AG046139)
  • National Institute of Neurological Disorders and Stroke (R01 NS080820, R01 NS078086)
Topics
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Alzheimer's disease research and treatments
  • Health Sciences › Medicine › Psychiatry and Mental health › Dementia and Cognitive Impairment Research
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
Keywords
PLCγ2, missense mutations, Alzheimer's disease, neurodegenerative diseases, progressive supranuclear palsy, Parkinson's disease, dementia with Lewy bodies, multiple system atrophy, genetic risk factors, African Americans, temporal cortex, cerebellum, co-expression network, gene regulatory networks, transcription factor binding sites, protein-protein interaction network
MeSH terms
Aged, Aged, 80 and over, Black or African American, Brain, Female, Humans, Male, Risk Factors, Microglia, Neurodegenerative Diseases, Mutation, Missense, White People, Adaptor Proteins, Signal Transducing, Phospholipase C gamma

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