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Homozygous THAP1 mutations as cause of early‐onset generalized dystonia
Author(s) -
Schneider Susanne A.,
Ramirez Alfredo,
Shafiee Kaveh,
Kaiser Frank J.,
Erogullari Alev,
Brüggemann Norbert,
Winkler Susen,
Bahman Ideh,
Osmanovic Alma,
Shafa Mohammad A.,
Bhatia Kailish P.,
Najmabadi Hossein,
Klein Christine,
Lohmann Katja
Publication year - 2011
Publication title -
movement disorders
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.352
H-Index - 198
eISSN - 1531-8257
pISSN - 0885-3185
DOI - 10.1002/mds.23561
Subject(s) - missense mutation , dystonia , mutation , genetics , biology , gene , compound heterozygosity , heterozygote advantage , genotype , neuroscience
To identify the underlying genetic cause in a consanguineous family with apparently recessively inherited dystonia, we performed genome‐wide homozygosity mapping. This revealed 2 candidate regions including the THAP1 gene, where heterozygous mutations cause dystonia 6. A homozygous missense mutation in THAP1 (c.95T>A; p.Leu32His) was found in all 3 affected siblings. Symptoms started in childhood in the legs and became generalized within a few years. Three heterozygous mutation carriers were unaffected. Because THAP1 regulates the expression of the DYT1 gene, we used reporter gene assays to show that DYT1 expression was significantly increased for Leu32His. However, this increase was less pronounced than for other THAP1 mutations that cause dystonia in the heterozygous state. Our data suggest that homozygous THAP1 mutations cause dystonia and may be associated with a less severe dysfunction of the encoded protein compared with heterozygous disease‐causing mutations. © 2011 Movement Disorder Society