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Is TOR1A a risk factor in adult-onset primary torsion dystonia?
Justus L Groen1, Katja Ritz, Michael W Tanck
1Department of Neurology, Academic Medical Center, University of Amsterdam, Amsterdam, the Netherlands.
Background:
Studies of genetic association between TOR1A and adult-onset primary torsion dystonia have contradictory results.
Methods:
The authors genotyped TOR1A single nucleotide polymorphisms rs1801968, rs2296793, rs1182 and rs3842225 in a cohort of clinically well characterized cervical dystonia patients (n=367) and constructed haplotypes. The authors systematically reviewed the published case-control TOR1A association studies in adult-onset primary torsion dystonia.
Results:
In this Dutch cervical dystonia cohort, no significant association was found with TOR1A variants. In the meta-analysis (eight studies, 1332 adult-onset primary dystonia patients) no variant reached overall significance. However, in a selection of familial cases the functional variant p.Asp216His (rs1801968) was associated with increased dystonia risk (odds ratio 1.43; 95%CI 1.01-2.02).
Conclusions:
Meta-analysis does not show association with common variants in TOR1A in adult-onset primary dystonia, except for the functional variant rs1801968 in familial focal dystonia cases.
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