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Published in: Brain Structure and Function 5/2015

01-09-2015 | Original Article

Magnified effects of the COMT gene on white-matter microstructure in very old age

Authors: Goran Papenberg, Martin Lövdén, Erika J. Laukka, Grégoria Kalpouzos, Lina Keller, Caroline Graff, Ylva Köhncke, Tie-Qiang Li, Laura Fratiglioni, Lars Bäckman

Published in: Brain Structure and Function | Issue 5/2015

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Abstract

Genetic factors may partly account for between-person differences in brain integrity in old age. Evidence from human and animal studies suggests that the dopaminergic system is implicated in the modulation of white-matter integrity. We investigated whether a genetic variation in the Catechol-O-Methyltransferase (COMT) Val158Met polymorphism, which influences dopamine availability in prefrontal cortex, contributes to interindividual differences in white-matter microstructure, as measured with diffusion-tensor imaging. In a sample of older adults from a population-based study (60–87 years; n = 238), we found that the COMT polymorphism affects white-matter microstructure, indexed by fractional anisotropy and mean diffusivity, of several white-matter tracts in the oldest age group (81–87 years), although there were no reliable associations between COMT and white-matter microstructure in the two younger age groups (60–66 and 72–78 years). These findings extend previous observations of magnified genetic effects on cognition in old age to white-matter integrity.
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Metadata
Title
Magnified effects of the COMT gene on white-matter microstructure in very old age
Authors
Goran Papenberg
Martin Lövdén
Erika J. Laukka
Grégoria Kalpouzos
Lina Keller
Caroline Graff
Ylva Köhncke
Tie-Qiang Li
Laura Fratiglioni
Lars Bäckman
Publication date
01-09-2015
Publisher
Springer Berlin Heidelberg
Published in
Brain Structure and Function / Issue 5/2015
Print ISSN: 1863-2653
Electronic ISSN: 1863-2661
DOI
https://doi.org/10.1007/s00429-014-0835-4

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