Analysis of Common Genetic Variation of Anxiety Disorders in Essential Tremor.

The objective of this study is to explore the association of common genetic variation of anxiety disorders and essential tremor (ET). We genotyped 25 anxiety-specific risk variants in a cohort of 478 unrelated ET patients and 504 age and gender-matched healthy controls from eastern China using a MassARRAY system. The association between candidate variants and ET patients was evaluated using gene-based analysis. A total of 159 patients (33.3%) had anxiety. In genotypic analysis, rs708012 (in an intergenic region) in the dominant models was found to be significantly associated with ET (P < 0.001, OR = 0.605). In allelic analysis, the carriers of the C allele of NTRK2 rs1187280 (P = 0.027, OR = 0.626), T allele of TMEM106B rs3807866 (P = 0.030, OR = 1.287), and T allele of rs708012 (P < 0.001, OR = 0.679) occupy a larger proportion of ET patients compared with healthy controls. Anxiety-specific risk SNPs of TMEM106B rs3807866 increase the risk for ET, while two SNPs of NTRK2 rs1187280 and rs708012 show a protective role.