Dystrophia canthorum in Waardenburg syndrome with a novel MITF mutation
Author:
Corresponding Author:

Xing-Chao Shentu and Ye-Lei Tang. The Second Affiliated Hospital of Zhejiang University, School of Medicine, No.88 Jiafang Road, Hangzhou 310009, Zhejiang Province, China. stxc@zju.edu.cn

Affiliation:

Clc Number:

Fund Project:

Supported by the National Natural Science Foundation of China (No.81800807; No.81670834; No.81970781; No.81800869); the Natural Science Foundation of Zhejiang Province (No.LY17H090004).

  • Article
  • |
  • Figures
  • |
  • Metrics
  • |
  • Reference
  • |
  • Related
  • |
  • Cited by
  • |
  • Materials
  • |
  • Comments
    Abstract:

    AIM: To reveal a novel MITF gene mutation in Waardenburg syndrome (WS), which is an autosomal dominant inherited neurogenic disorder that consists of various degrees of sensorineural deafness and pigmentary abnormalities in the eyes, hair and skin. METHODS: The genetic analysis of the Chinese family was conducted by whole-exome sequencing, then the results were confirmed by Sanger sequencing. RESULTS: WS is classified into type I to IV, which are identified by the W index, clinical characteristics and additional features. The MITF gene mostly accounts for WS type II. In this study, a de novo heterozygous mutation in the MITF gene, c.638A>G in exon 7, was identified in the patient diagnosed with WS type I features, as the W index was 2.17 (over 2.10), with dystrophia canthorum, congenital bilateral profound hearing loss, bilateral heterochromia irides, premature greying of the hair, and excessive freckling on the face at birth. She also underwent refractive errors and esotropia, reduced pigmentation of the choroid and visible choroid vessels. The mutation was not found in previous studies or mutation databases. CONCLUSION: The novel mutation in the MITF gene, which altered the protein in amino acids 213 from the glutamic acid to glycine, is the genetic pathological cause for WS features in the patient. Those characteristics of this family revealed a novel genetic heterogeneity of MITF in WS, which expanded the database of MITF mutations and offered a possible in correcting the W index value of WS in distinct ethnicities. Moreover, ocular symptoms should be emphasized in all types of WS patients.

    Reference
    Related
    Cited by
Get Citation

Xia-Jing Tang, Xi-Yuan Ping, Chen-Qi Luo, et al. Dystrophia canthorum in Waardenburg syndrome with a novel MITF mutation. Int J Ophthalmol, 2020,13(7):1054-1059

Copy
Share
Article Metrics
  • Abstract:
  • PDF:
  • HTML:
  • Cited by:
Publication History
  • Received:December 23,2019
  • Revised:April 29,2020
  • Adopted:
  • Online: May 27,2020
  • Published: