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Expansion of GGC repeat in the human-specific NOTCH2NLC gene is associated with essential tremor.
Brain ( IF 10.6 ) Pub Date : 2020-01-01 , DOI: 10.1093/brain/awz372
Qi-Ying Sun 1, 2, 3 , Qian Xu 1 , Yun Tian 2, 3 , Zheng-Mao Hu 4, 5 , Li-Xia Qin 1 , Jin-Xia Yang 2 , Wen Huang 4 , Jin Xue 4 , Jin-Chen Li 3 , Sheng Zeng 1 , Ying Wang 6 , Hao-Xuan Min 7 , Xiao-Yu Chen 8 , Jun-Pu Wang 6 , Bin Xie 6 , Fan Liang 7 , Hai-Nan Zhang 9 , Chun-Yu Wang 9 , Li-Fang Lei 10 , Xin-Xiang Yan 1 , Hong-Wei Xu 2 , Ran-Hui Duan 4, 5 , Kun Xia 4, 5 , Jing-Yu Liu 11 , Hong Jiang 1, 12 , Lu Shen 1, 3 , Ji-Feng Guo 1 , Bei-Sha Tang 1, 2, 3, 12
Affiliation  

Essential tremor is one of the most common movement disorders. Despite its high prevalence and heritability, the genetic aetiology of essential tremor remains elusive. Up to now, only a few genes/loci have been identified, but these genes have not been replicated in other essential tremor families or cohorts. Here we report a genetic study in a cohort of 197 Chinese pedigrees clinically diagnosed with essential tremor. Using a comprehensive strategy combining linkage analysis, whole-exome sequencing, long-read whole-genome sequencing, repeat-primed polymerase chain reaction and GC-rich polymerase chain reaction, we identified an abnormal GGC repeat expansion in the 5' region of the NOTCH2NLC gene that co-segregated with disease in 11 essential tremor families (5.58%) from our cohort. Clinically, probands that had an abnormal GGC repeat expansion were found to have more severe tremor phenotypes, lower activities of daily living ability. Obvious genetic anticipation was also detected in these 11 essential tremor-positive families. These results indicate that abnormal GGC repeat expansion in the 5' region of NOTCH2NLC gene is associated with essential tremor, and provide strong evidence that essential tremor is a family of diseases with high clinical and genetic heterogeneities.
更新日期:2019-12-31
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