Ataxin-2 repeat-length variation and neurodegeneration.

Abstract:

:Expanded glutamine repeats of the ataxin-2 (ATXN2) protein cause spinocerebellar ataxia type 2 (SCA2), a rare neurodegenerative disorder. More recent studies have suggested that expanded ATXN2 repeats are a genetic risk factor for amyotrophic lateral sclerosis (ALS) via an RNA-dependent interaction with TDP-43. Given the phenotypic diversity observed in SCA2 patients, we set out to determine the polymorphic nature of the ATXN2 repeat length across a spectrum of neurodegenerative disorders. In this study, we genotyped the ATXN2 repeat in 3919 neurodegenerative disease patients and 4877 healthy controls and performed logistic regression analysis to determine the association of repeat length with the risk of disease. We confirmed the presence of a significantly higher number of expanded ATXN2 repeat carriers in ALS patients compared with healthy controls (OR = 5.57; P= 0.001; repeat length >30 units). Furthermore, we observed significant association of expanded ATXN2 repeats with the development of progressive supranuclear palsy (OR = 5.83; P= 0.004; repeat length >30 units). Although expanded repeat carriers were also identified in frontotemporal lobar degeneration, Alzheimer's and Parkinson's disease patients, these were not significantly more frequent than in controls. Of note, our study identified a number of healthy control individuals who harbor expanded repeat alleles (31-33 units), which suggests caution should be taken when attributing specific disease phenotypes to these repeat lengths. In conclusion, our findings confirm the role of ATXN2 as an important risk factor for ALS and support the hypothesis that expanded ATXN2 repeats may predispose to other neurodegenerative diseases, including progressive supranuclear palsy.

journal_name

Hum Mol Genet

journal_title

Human molecular genetics

authors

Ross OA,Rutherford NJ,Baker M,Soto-Ortolaza AI,Carrasquillo MM,DeJesus-Hernandez M,Adamson J,Li M,Volkening K,Finger E,Seeley WW,Hatanpaa KJ,Lomen-Hoerth C,Kertesz A,Bigio EH,Lippa C,Woodruff BK,Knopman DS,White CL 3r

doi

10.1093/hmg/ddr227

subject

Has Abstract

pub_date

2011-08-15 00:00:00

pages

3207-12

issue

16

eissn

0964-6906

issn

1460-2083

pii

ddr227

journal_volume

20

pub_type

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