Cited by 112Alzheimer's disease research and treatmentsDementia and Cognitive Impairment ResearchAmyotrophic Lateral Sclerosis Research

The effect of TOMM40 poly‐T length on gray matter volume and cognition in middle‐aged persons with APOEɛ 3/ɛ 3 genotype

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Johnson, Sterling C., La Rue, Asenath, Hermann, Bruce P., Xu, Guofan, Koscik, Rebecca L., Jonaitis, Erin M., Bendlin, Barbara B., Hogan, Kirk J. +6 more·2011·Alzheimer's & Dementia

Abstract

OBJECTIVE: Apolipoprotein E (APOE) genotypes are associated with variable risk of developing late-onset Alzheimer's disease (LOAD), with APOE epsilon 4 (APOE ε4) having higher risk. A variable poly-T length polymorphism at rs10524523, within intron 6 of the translocase of the outer mitochondrial membrane (TOMM40) gene, has been shown to influence age of onset in LOAD, with very long (VL) poly-T length associated with earlier disease onset, and short poly-T length associated with later onset. In this study, we tested the hypothesis that brain and cognitive changes suggestive of presymptomatic LOAD may be associated with this TOMM40 polymorphism. METHODS: Among healthy APOE ε3 homozygous adults (N = 117; mean age, 55 years), we compared those who were homozygous for VL/VL (n = 35) TOMM40 poly-T lengths (who were presumably at higher risk) with those homozygous for short (S/S; n = 38) poly-T lengths, as well as those with heterozygous (S/VL; n = 44) poly-T length polymorphisms, on measures of learning and memory and on structural brain imaging. RESULTS: The VL/VL group showed lower performance than the S/S TOMM40 group on primacy retrieval from a verbal list learning task, a finding which is also seen in early Alzheimer's disease. A dose-dependent increase in the VL TOMM40 polymorphism (from no VL alleles, to S/VL heterozygous, to VL/VL homozygous) was associated with decreasing gray matter volume in the ventral posterior cingulate and medial ventral precuneus, a region of the brain affected early in LOAD. CONCLUSIONS: These findings among APOE ε3/ε3 late middle-aged adults suggest that a subgroup with VL TOMM40 poly-T lengths may be experiencing incipient LOAD-related cognitive and brain changes.

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Authors
Johnson, S. C., La Rue, A., Hermann, B. P., Xu, G., Koscik, R. L., Jonaitis, E. M., Bendlin, B. B., Hogan, K. J., Roses, A. D., Saunders, A. M., Lutz, M. W., Asthana, S., Green, R. C., & Sager, M. A.
Affiliations
  • University of Wisconsin–Madison (US)
  • Wisconsin Alzheimer's Institute University of Wisconsin School of Medicine and Public Health Madison WI USA
  • Duke University (US)
  • Boston University (US)
Corresponding author
Johnson, Sterling C.
Venue
Alzheimer's & Dementia
Publisher
Wiley
Published
2011-07
Volume
7
Issue
4
Pages
456-465
ISSN
  • 1552-5260 (ISSN-L)
  • 1552-5279
OpenAlex
W2085579734
Cited by
112
References
41
Citations by year
2025: 4 · 2024: 4 · 2023: 7 · 2022: 3 · 2021: 6 · 2020: 9 · 2019: 6 · 2018: 7 · 2017: 16 · 2016: 7 · 2015: 7 · 2014: 12 · 2013: 9 · 2012: 14
FWCI
7.85
Type
journal article
Language
en
Open access
Locations
  • Alzheimer s & Dementia (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • Helen Bader Foundation
  • Northwestern Mutual Foundation
  • Extendicare Foundation
Topics
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Health Sciences › Medicine › Psychiatry and Mental health › Dementia and Cognitive Impairment Research
  • Health Sciences › Medicine › Neurology › Amyotrophic Lateral Sclerosis Research
Keywords
TOMM40
MeSH terms
Mitochondrial Precursor Protein Import Complex Proteins, Age Factors, Alzheimer Disease, Analysis of Variance, Brain, Cognition Disorders, Female, Gene Frequency, Genotype, Humans, Image Processing, Computer-Assisted, Magnetic Resonance Imaging, Male, Middle Aged, Neuropsychological Tests, Poly T, Risk Factors, Polymorphism, Single Nucleotide, Membrane Transport Proteins, Apolipoprotein E3

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