White Matter Hyperintensities Are Under Strong Genetic Influence.

Abstract:

BACKGROUND AND PURPOSE:The genetic basis of white matter hyperintensities (WMH) is still unknown. This study examines the heritability of WMH in both sexes and in different brain regions, and the influence of age. METHODS:Participants from the Older Australian Twins Study were recruited (n=320; 92 monozygotic and 68 dizygotic pairs) who volunteered for magnetic resonance imaging scans and medical assessments. Heritability, that is, the ratio of the additive genetic variance to the total phenotypic variance, was estimated using the twin design. RESULTS:Heritability was high for total WMH volume (0.76), and for periventricular WMH (0.64) and deep WMH (0.77), and varied from 0.18 for the cerebellum to 0.76 for the occipital lobe. The genetic correlation between deep and periventricular WMH regions was 0.85, with one additive genetics factor accounting for most of the shared variance. Heritability was consistently higher in women in the cerebral regions. Heritability in deep but not periventricular WMH declined with age, in particular after the age of 75. CONCLUSIONS:WMH have a strong genetic influence but this is not uniform through the brain, being higher for deep than periventricular WMH and in the cerebral regions. The genetic influence is higher in women, and there is an age-related decline, most markedly for deep WMH. The data suggest some heterogeneity in the pathogenesis of WMH for different brain regions and for men and women.

journal_name

Stroke

journal_title

Stroke

authors

Sachdev PS,Thalamuthu A,Mather KA,Ames D,Wright MJ,Wen W,OATS Collaborative Research Team.

doi

10.1161/STROKEAHA.116.012532

subject

Has Abstract

pub_date

2016-06-01 00:00:00

pages

1422-8

issue

6

eissn

0039-2499

issn

1524-4628

pii

STROKEAHA.116.012532

journal_volume

47

pub_type

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