Abstract
Recent studies have confirmed the utility of massively parallel sequencing (MPS) in addressing genetically heterogeneous hereditary hearing impairment. By applying a MPS diagnostic panel targeting 129 known deafness genes, we identified a novel frameshift GATA3 mutation, c.149delT (p.Phe51LeufsX144), in a hearing-impaired family compatible with autosomal dominant inheritance. The GATA3 haploinsufficiency is thought to be associated with the hypoparathyroidism, sensorineural deafness, and renal dysplasia (HDR) syndrome. The pathogenicity of GATA3 c.149delT was supported by its absence in the 5400 NHLBI exomes, 1000 Genomes, and the 100 normal hearing controls of the present study; the co-segregation of c.149delT heterozygosity with hearing impairment in 9 affected members of the family; as well as the nonsense-mediated mRNA decay of the mutant allele in in vitro functional studies. The phenotypes in this family appeared relatively mild, as most affected members presented no signs of hypoparathyroidism or renal abnormalities, including the proband. To our knowledge, this is the first report of genetic diagnosis of HDR syndrome before the clinical diagnosis. Genetic examination for multiple deafness genes with MPS might be helpful...Continue Reading
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