Open AccessIdentification of a novel heterozygous SOX9 variant in a Chinese family with congenital heart disease
Author(s) -
Gong Li,
Wang Chunyan,
Xie Haiyang,
Gao Jun,
Li Tengyan,
Qi Shenggui,
Wang Binbin,
Wang Jing
Publication year - 2022
Publication title -
molecular genetics and genomic medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.765
H-Index - 29
ISSN - 2324-9269
DOI - 10.1002/mgg3.1909
Subject(s) - proband , penetrance , genetics , missense mutation , sanger sequencing , exome sequencing , biology , aunt , genetic counseling , medicine , mutation , gene , phenotype , sociology , anthropology
Background Previous studies of individuals with hereditary or sporadic congenital heart disease (CHD) have provided strong evidence for a genetic basis for CHD. The aim of this study was to identify novel pathogenic genes and variants in a Chinese CHD family. Methods Three generations of a family with CHD were recruited. We performed whole exome sequencing for the affected individuals and the proband's unaffected aunt to investigate the genetic causes of CHD in this family. Heterozygous variants carried by the proband and her maternal grandmother, but not the proband's aunt, were selected. The frequencies of the variants detected were assessed using public databases, and their influences on protein function were predicted using online prediction software. The candidate variant was further confirmed by Sanger sequencing of other members of the family. Results On the basis of the family's pedigree, the mode of inheritance was speculated to be autosomal dominant with incomplete penetrance. We identified a novel heterozygous missense variant in SOX9 in all affected individuals and one asymptomatic family member, suggesting an inheritance pattern with incomplete penetrance. The variant was not found in any public database. In addition, the variant was highly conserved among mammals, and was predicted to be deleterious by online software programs. Conclusions We report for the first time a novel heterozygous missense variant in SOX9 (NM_000346:c.931G>T:p.Gly311Cys) in a Chinese CHD family. Our results provide further evidence supporting a causative role for SOX9 variants in CHD.