title: Novel mutations of PAX3, MITF, and SOX10 genes in Chinese patients with type I or type II Waardenburg syndrome.
abstract: Waardenburg syndrome (WS) is a rare disorder characterized by distinctive facial features, pigment disturbances, and sensorineural deafness. There are four WS subtypes. WS1 is mostly caused by PAX3 mutations, while MITF, SNAI2, and SOX10 mutations are associated with WS2. More than 100 different disease-causing mutations have been reported in many ethnic groups, but the data from Chinese patients with WS remains poor. Herein we report 18 patients from 15 Chinese WS families, in which five cases were diagnosed as WS1 and the remaining as WS2. Clinical evaluation revealed intense phenotypic variability in Chinese WS patients. Heterochromia iridis and sensorineural hearing loss were the most frequent features (100% and 88.9%, respectively) of the two subtypes. Many brown freckles on normal skin could be a special subtype of cutaneous pigment disturbances in Chinese WS patients. PAX3, MITF, SNAI2, and SOX10 genes mutations were screened for in all the patients. A total of nine mutations in 11 families were identified and seven of them were novel. The SOX10 mutations in WS2 were first discovered in the Chinese population, with an estimated frequency similar to that of MITF mutations, implying SOX10 is an important pathogenic gene in Chinese WS2 cases and should be considered for first-step analysis in WS2, as well as MITF.
authors.affiliation: Department of Otolaryngology, Xiangya Hospital, Central South University, 87 Xiangya Road, Changsha, Hunan, China.
authors.forename: Hongsheng
authors.initials: H
authors.lastname: Chen
authors.forename: Lu
authors.initials: L
authors.lastname: Jiang
authors.forename: Zhiguo
authors.initials: Z
authors.lastname: Xie
authors.forename: Lingyun
authors.initials: L
authors.lastname: Mei
authors.forename: Chufeng
authors.initials: C
authors.lastname: He
authors.forename: Zhengmao
authors.initials: Z
authors.lastname: Hu
authors.forename: Kun
authors.initials: K
authors.lastname: Xia
authors.forename: Yong
authors.initials: Y
authors.lastname: Feng
mesh_terms: D000293:Adolescent; D000328:Adult; D044466:Asian People / Q000235:genetics; D002648:Child; D002675:Child, Preschool; D005260:Female; D006801:Humans; D007223:Infant; D008297:Male; D051739:Microphthalmia-Associated Transcription Factor / Q000235:genetics*; D009154:Mutation; D000072041:PAX3 Transcription Factor; D051761:Paired Box Transcription Factors / Q000235:genetics*; D010375:Pedigree; D055757:SOXE Transcription Factors / Q000235:genetics*; D014849:Waardenburg Syndrome / Q000235:genetics*; D055815:Young Adult
chemical_list: C497234:MITF protein, human; D051739:Microphthalmia-Associated Transcription Factor; D000072041:PAX3 Transcription Factor; C489409:PAX3 protein, human; D051761:Paired Box Transcription Factors; C527923:SOX10 protein, human; D055757:SOXE Transcription Factors