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BMC Ophthalmology

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01-12-2020 | Pigmentary Retinopathy | Research article

Mutation screening of the USH2A gene reveals two novel pathogenic variants in Chinese patients causing simplex usher syndrome 2

Authors: Chenhao He, Xinyu Liu, Zilin Zhong, Jianjun Chen

Published in: BMC Ophthalmology | Issue 1/2020

Abstract

Background

Usher syndrome (USH) is the most prevalent cause of the human genetic deafness and blindness. USH type II (USH2) is the most common form of USH, and USH2A is the major pathogenic gene for USH2. For expanding the spectrum of USH2A mutations and further revealing the role of USH2A in USH2, we performed the USH2A gene variant screening in Chinese patients with USH2.

Methods

Genomic DNA was extracted from peripheral blood of unrelated Chinese USH2 patients, we designed specific primers for amplifying the coding region (exons 2–72) of the USH2A gene. Sanger sequencing was used to study alleles. Silico prediction tools were used to predict the pathogenicity of the variants identified in these patients.

Results

Five heterozygous pathogenic variants were detected in four patients. Two patients were found to have two-mutations and two patients only have one. Two novel variants c.4217C > A (p.Ser1406X) and c.11780A > G (p.Asp3927Gly)) were predicted deleterious by computer prediction algorithms. In addition, three reported mutations (c.8559-2A > G, c.8232G > C and c.11389 + 3A > T) were also found in this study.

Conclusions

We identified five heterozygous pathogenic variants in the USH2A gene in Chinese patients diagnosed with Usher syndrome type 2, two of which were not reported. It expands the spectrum of USH2A variants in USH.

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Title: Mutation screening of the USH2A gene reveals two novel pathogenic variants in Chinese patients causing simplex usher syndrome 2
Authors: Chenhao He
Xinyu Liu
Zilin Zhong
Jianjun Chen
Publication date: 01-12-2020
Publisher: BioMed Central
Keyword: Pigmentary Retinopathy
Published in: BMC Ophthalmology / Issue 1/2020
Electronic ISSN: 1471-2415
DOI: https://doi.org/10.1186/s12886-020-01342-y

Keynote webinar | Spotlight on medication adherence

Springer Medicine

Mutation screening of the USH2A gene reveals two novel pathogenic variants in Chinese patients causing simplex usher syndrome 2

Abstract

Background

Methods

Results

Conclusions

Keynote webinar | Spotlight on medication adherence

Springer Medicine

Abstract

Background

Methods

Results

Conclusions

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