title: Genotypes and phenotypes of a family with a deaf child carrying combined heterozygous mutations in SLC26A4 and GJB3 genes.
abstract: Mutations in the SLC26A4 gene have been shown to cause a type of deafness referred to as large vestibular aqueduct syndrome (LVAS), whereas mutations in the GJB3 gene have been associated with nonsyndromic deafness. However, the clinical phenotypes of these mutations vary and remain to be fully elucidated. The present study performed genetic analysis of a Chinese family, in which the child was deaf and the parents were healthy. Sanger sequencing demonstrated that the affected individual harbored three heterogeneous mutations in the SLC26A4 and GJB3 genes, as follows: SLC26A4 IVS-2 A>G, SLC26A4 c.2168 A>G and GJB3 c.538 C>T. The affected individual exhibited hearing loss and was diagnosed with LVAS by computed tomography scan. The mother and father of the affected individual harbored the heterogeneous mutations of SLC26A4 IVS-2 A>G and GJB3 c.538 C>T, and the heterozygous mutation of SLC26A4 c.2168 A>G, respectively. Neither parents exhibited any hearing loss. The results obtained from the deaf patient provided genetic and clinical evidence that carrying combined heterogeneous mutations in the GJB3 and SLC26A4 genes may be involved in the etiology of severe hearing loss, of which the mechanism requires further examination.
authors.affiliation: Medical Faculty, Affiliated Hospital of Kunming University of Science and Technology (The First People's Hospital of Yunnan Province), Kunming University of Science and Technology, Kunming, Yunan 650500, P.R. China.
authors.forename: Yunlong
authors.initials: Y
authors.lastname: Li
authors.affiliation: Medical Faculty, Affiliated Hospital of Kunming University of Science and Technology (The First People's Hospital of Yunnan Province), Kunming University of Science and Technology, Kunming, Yunan 650500, P.R. China.
authors.forename: Baosheng
authors.initials: B
authors.lastname: Zhu
mesh_terms: D000483:Alleles; D000595:Amino Acid Sequence; D017630:Connexins / Q000235:genetics*; D017124:Conserved Sequence; D004252:DNA Mutational Analysis; D005091:Exons; D056726:Genetic Association Studies; D034381:Hearing Loss / Q000175:diagnosis* / Q000235:genetics*; D006579:Heterozygote; D006801:Humans; D026901:Membrane Transport Proteins / Q000235:genetics*; D009154:Mutation; D010375:Pedigree; D010641:Phenotype; D000076988:Sulfate Transporters
chemical_list: D017630:Connexins; D026901:Membrane Transport Proteins; C085609:SLC26A4 protein, human; D000076988:Sulfate Transporters; C068044:GJB3 protein, human