The deafness-dystonia syndrome(DDS) is also known as Mohr-Tranebjaerg syndrome (MTS,MIM 304700).It is a rare X...
Cheng Wang1,Yulei Li1,Jun Yu Luo2,Jing Yu Liu(1) 1.College of Life Science and Technology,Huazhong University of Science and Technology,Wuhan,Hubei, 430074,P.R.China 2.Affiliated Secondary School,Huazhong University of Science and Technology,Wuhan,Hubei, 430074,P.R.China
The γ-actin (ACTG1) gene is a cytoplasmic nonmuscle actin gene, which encodes a major cytoskeletal protein in the sensory hair cells of the cochlea. Mutations in ACTG1 were found to cause autosomal dominant, progressive, sensorineural hearing loss linked to the DFNA 20/26 locus on chromosome 17q25.3 in European and American families, respectively. In this study, a novel missense mutation (c.364A>G; p.I122V) co-segregated with the affected individuals in the family and did not exist in the unaffected family members and 150 unrelated normal controls. The alteration of residue Ile122 was predicted to damage its interaction with actin-binding proteins, which may cause disruption of hair cell organization and function. These findings strongly suggested that the I122V mutation in ACTG1 caused autosomal dominant non-syndromic hearing impairment in a Chinese family and expanded the spectrum of ACTG1 mutations causing hearing loss.
