Low Prevalence of <scp><i>NOTCH2NLC</i> GGC</scp> Repeat Expansion in White Patients with Movement Disorders
Wai Yan Yau, Jana Vandrovcová, Roisin Sullivan, Zhongbo Chen, Anna Zecchinelli, Roberto Cilia, Stefano Duga, Malgorzata Murray, Susana Carmona, Viorica Chelban, Hiroyuki Ishiura, Shoji Tsuji, Zane Jaunmuktane, Chris Turner, Nicholas Wood, Henry Houlden
Abstract
BACKGROUND: The objective of this study was to determine the prevalence of the GGC-repeat expansion in NOTCH2NLC in whites presenting with movement disorders. METHODS: We searched for the GGC-repeat expansion in NOTCH2NLC using repeat-primed polymerase chain reaction in 203 patients with essential tremor, 825 patients with PD, 194 patients with spinocerebellar ataxia, 207 patients with "possible" or "probable" MSA, and 336 patients with pathologically confirmed MSA. We also screened 30,008 patients enrolled in the 100,000 Genomes Project for the same mutation using ExpansionHunter, followed by repeat-primed polymerase chain reaction. All possible expansions were confirmed by Southern blotting and/or long-read sequencing. RESULTS: We identified 1 patient who carried the NOTCH2NLC mutation in the essential tremor cohort, and 1 patient presenting with recurrent encephalopathy and postural tremor/parkinsonism in the 100,000 Genomes Project. CONCLUSIONS: GGC-repeat expansion in NOTCH2NLC is rare in whites presenting with movement disorders. In addition, existing whole-genome sequencing data are useful in case ascertainment. © 2020 The Authors. Movement Disorders published by Wiley Periodicals LLC on behalf of International Parkinson and Movement Disorder Society.