Soyal SM, Kwik M, Kalev O, Lenz S, Zara G, Strasser P, Patsch W, Weis S. A TOMM40/APOE allele encoding APOE-E3 predicts high likelihood of late-onset Alzheimer's disease in autopsy cases.
Mol Genet Genomic Med 2020;
8:e1317. [PMID:
32472747 PMCID:
PMC7434743 DOI:
10.1002/mgg3.1317]
[Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2019] [Revised: 04/22/2020] [Accepted: 04/27/2020] [Indexed: 01/18/2023] Open
Abstract
BACKGROUND
The APOE-ε4 allele is an established risk factor for Alzheimer's disease (AD). TOMM40 located adjacent to APOE has also been implicated in AD but reports of TOMM40 associations with AD that are independent of APOE-ε4 are at variance.
METHODS
We investigated associations of AD with haplotypes defined by three TOMM40 and two APOE single nucleotide polymorphisms in 73 and 71 autopsy cases with intermediate and high likelihood of AD (defined by BRAAK stages
RESULTS
We observed eight haplotypes with a frequency >0.02. The two haplotypes encoding APOE-E4 showed strong associations with AD that did not differ between intermediate and high likelihood AD. In contrast, a TOMM40 haplotype encoding APOE-E3 was identified as risk haplotype of high- (p = .0186), but not intermediate likelihood AD (p = .7530). Furthermore, the variant allele of rs2075650 located in intron 2 of TOMM40, increased the risk of high-, but not intermediate likelihood AD on the APOE-ε3/ε3 background (p = .0230).
CONCLUSION
The striking association of TOMM40 only with high likelihood AD may explain some contrasting results for TOMM40 in clinical studies and may reflect an association with more advanced disease and/or suggest a role of TOMM40 in the pathogenesis of neurofibrillary tangles.
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Affiliation(s)
- Selma M. Soyal
- Institute of Pharmacology and ToxicologyParacelsus Medical UniversitySalzburgAustria
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- Markus Kwik
- Institute of Pharmacology and ToxicologyParacelsus Medical UniversitySalzburgAustria
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- Ognian Kalev
- Division of NeuropathologyNeuromed Campus, Kepler University HospitalLinzAustria
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- Stefan Lenz
- Division of NeuropathologyNeuromed Campus, Kepler University HospitalLinzAustria
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- Greta Zara
- Institute of Pharmacology and ToxicologyParacelsus Medical UniversitySalzburgAustria
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- Peter Strasser
- Institute of Laboratory MedicineParacelsus Medical UniversitySalzburgAustria
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- Wolfgang Patsch
- Institute of Pharmacology and ToxicologyParacelsus Medical UniversitySalzburgAustria
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- Serge Weis
- Division of NeuropathologyNeuromed Campus, Kepler University HospitalLinzAustria
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