Functional study and pathogenicity classification of PRRT2 missense variants in PRRT2-related disorders.

A new interesting article has been published in CNS Neurosci Ther. 2019 May 23. doi: 10.1111/cns.13147. and titled:

Functional study and pathogenicity classification of PRRT2 missense variants in PRRT2-related disorders.

Authors of this article are:

Zhao SY, Li LX, Chen YL, Chen YJ, Liu GL, Dong HL, Chen DF, Li HF, Wu ZY.

A summary of the article is shown below:

AIMS: PRRT2 variants are associated with various paroxysmal disorders. To date, more than 90 PRRT2 variants have been reported in PRRT2-related disorders. Lack of functional study in majority of missense variants makes their pathogenicity uncertain. We aim to evaluate the clinical significance of PRRT2 missense variants by performing in vitro experiments.METHODS: We systematically reviewed PRRT2-related disorders and summarized reported PRRT2 missense variants. Protein expression and subcellular localization of mutant PRRT2 were investigated in mammal cells. American College of Medical Genetics and Genomics (ACMG) guidelines were used to analyze the pathogenicity of PRRT2 missense variants.RESULTS: A total of 29 PRRT2 missense variants were identified in PRRT2-related disorders. Ten variants were observed to affect both subcellular localization and protein level, three variants only affect membrane localization, and two variants only affect protein level. According to ACMG guidelines, 15 variants were finally classified as “likely pathogenic”, three as “benign”, three as “likely benign”, and eight as “uncertain significance” variants. The likely pathogenic variants were concentrated in the C-terminal of PRRT2.CONCLUSIONS: The pathogenicity of eight uncertain significance variants needs further investigation. C-terminal of PRRT2 is crucial for its physiological function.© 2019 The Authors. CNS Neuroscience & Therapeutics Published by John Wiley & Sons Ltd.

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This article is a good source of information and a good way to become familiar with topics such as: PRRT2 ; missense variants; pathogenicity classification; protein level; subcellular localization.