Genetic testing and prenatal diagnosis for a Chinese pedigree affected with Waardenburg syndrome type 4C due to heterozygous deletion of SOX10 gene.
10.3760/cma.j.cn511374-20211028-00856
- Author:
Jingjing LI
1
;
Hongfei KANG
;
Xiangdong KONG
Author Information
1. Genetics and Prenatal Diagnosis Center, Department of Obstetrics and Gynecology, the First Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan 450052, China. kongxd@263.net.
- Publication Type:Journal Article
- MeSH:
Humans;
Female;
Pregnancy;
Pedigree;
Waardenburg Syndrome/genetics*;
East Asian People;
Genetic Testing;
Prenatal Diagnosis;
Hearing Loss, Sensorineural/genetics*;
Deafness/genetics*;
Mothers;
Constipation/genetics*;
Mutation;
SOXE Transcription Factors/genetics*
- From:
Chinese Journal of Medical Genetics
2023;40(11):1367-1372
- CountryChina
- Language:Chinese
-
Abstract:
OBJECTIVE:To explore the genetic basis for a Chinese pedigree featuring congenital profound syndromic deafness and chronic constipation, and provide prenatal diagnosis for a high-risk fetus.
METHODS:Whole-exome sequencing was carried out to analyze the sequences of genes associated with hereditary deafness, and multiplex ligation-dependent probe amplification (MLPA) was used to verify the candidate variant in the proband's parents and the fetus.
RESULTS:The proband was found to have harbored a heterozygous deletion of SOX10, a pathogenic gene associated with Waardenburg syndrome type 4C (WS4C). The same deletion was found in her mother (with profound syndromic deafness and chronic constipation) and the fetus, but not in her father with normal hearing. Based on the guidelines from the American College of Medical Genetics and Genomics (ACMG) and Association for Molecular Pathology (AMP), the SOX10 gene deletion was predicted to be a pathogenic variant (PVS1+PM2_Supporting+PP1+PP4).
CONCLUSION:The pedigree was diagnosed with WS4C, which has conformed to an autosomal dominant inheritance. Deletion of the entire SOX10 gene, as a loss-of-function variant, probably underlay its pathogenesis. Above finding has facilitated genetic counseling and prenatal diagnosis for this family.
