Effort to differentiate essential tremor plus and dystonic tremor using whole exome sequencing: an exploratory study

Author:

Pandey Sanjay,Yadav Navneesh,Dinesh Shreya,Rawat Chandra Shekhar,Thelma B. K.

Abstract

BackgroundThe clinical differentiation between essential tremor plus (ETP) and dystonic tremor (DT) is challenging. This study aimed at the genetic diagnosis of ETP and DT.MethodsWhole exome sequencing was performed on 50 probands (ETP = 25; DT = 25) and analysed to identify variants in known genes linked with dystonia and essential tremor plus phenotypes.ResultsWe identified pathogenic/likely pathogenic variants [THAP1 (n = 1) and ANO3 (n = 1)] in two patients with DT. In addition, one DT patient had a variant of uncertain significance in FUS and four patients had benign variants [CIZ1 (n = 1), COL6A3 (n = 1), GCH1 (n = 1), TENM4 (n = 1)]. One patient with ETP was detected to have a variant of uncertain significance in TENM4 and five patients with ETP had benign variants [COL6A3 (n = 2), VPS16 (n = 1), TAF1 (n = 1), KMT2B (n = 1)].ConclusionGenetic studies may be in an important biomarker in differentiating patients with ET plus from DT which is challenging in a clinical setting.

Funder

Department of Biotechnology, Ministry of Science and Technology, India

University Grants Commission

Publisher

Frontiers Media SA

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