[Analysis of genetic variation in patients with Waardenburg syndrome type Ⅱ by next generation sequencing].

Objective: To detect gene mutation sassociated with deafness in four Waardenburg syndrome (WS) type Ⅱ patients, and to explore the possible mechanism of molecular genetics. Methods: All patients with WS were identified at the genetic and prenatal diagnosis center of the First Affiliated Hospital of Zhengzhou University from August 2015 to December 2018.Clinical materials and peripheral blood were collected from patients and family members. The genes associated with deafness of the patients were tested by next generation sequencing(NGS). And suspected mutations were verified by Sanger sequencing. Results: All patients carried heterozygous mutations in SOX10, they were c.355_356insTCAGGCAGCGC, c.1106_1107insTGGGGCCCCCCACACTA, c.511T>C (p.Y171H), c.91_100del. According to the guidelines for genetic variation of the Amercian College of Medical Genetics and Genomics (ACMG), three frameshift mutations were pathogenic mutations, one missense mutation was likely pathogenic mutation. Conclusion: Application of next generation sequencing technologies make gene diagnosis of Waardenburg syndrome efficiently and accurately.目的： 对4个Ⅱ型Waardenburg综合征（WS）患者进行耳聋基因突变筛查，探讨可能的分子遗传学机制。 方法： 回顾性分析2015年8月至2018年12月间就诊于郑州大学第一附属医院遗传与产前诊断中心的4个Ⅱ型WS家系的临床资料。抽取患者及家系成员外周血标本，应用高通量测序技术（next generation sequencing，NGS）对患者进行耳聋基因检测，并对可疑基因突变进行Sanger测序验证和家系验证。 结果： 4例患者均携带SOX10基因杂合突变，突变位点分别为c.355_356insTCAGGCAGCGC、c.1106_1107insTGGGGCCCCCCACACTA、c.511T>C（p.Y171H）、c.91_100del，根据美国医学遗传学与基因组学学会（the Amercian College of Medical Genetics and Genomics，ACMG）制定的变异解读指南，3个移码突变判定为致病突变，1个错义突变判定为可能致病突变。 结论： 应用高通量测序技术可以高效准确地对WS患者进行基因诊断。.