MSH3 is a genetic modifier of somatic repeat instability in X-linked dystonia parkinsonism.

ABSTRACT: X-linked dystonia parkinsonism (XDP) is a progressive adult-onset neurogenerative disorder caused by the insertion of a SINE-VNTR-Alu (SVA) retrotransposon in TAF1. One element of the SVA is a tandem polymorphic CCCTCT repeat tract whose length inversely correlates with the age of disease onset. Previous observations that the repeat exhibits length-dependent somatic expansion and that XDP onset is modified by variation in DNA repair gene MSH3 indicated that somatic repeat expansion is an important disease driver. Here, we sought to uncover genetic modifiers of CCCTCT instability in XDP individuals and to provide a mechanistic link between somatic instability and disease. We determined quantitative metrics of both repeat expansion and repeat contraction in blood. Using genetic association a

SUBMITTER: Mejia Maza A 

PROVIDER: S-EPMC12824618 | biostudies-literature | 2026 Jan

REPOSITORIES: biostudies-literature