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KMID : 1195620130060010041
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Clinical and Experimental Otorhinolaryngology
2013 Volume.6 No. 1 p.41 ~ p.44
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A Novel Frameshift Mutation of the USH2A Gene in a Korean Patient with Usher Syndrome Type II
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Boo Sung-Hyun
Song Min-Jung
Kim Hee-Jin
Cho Yang-Sun
Chu Ho-Suk
Ko Moon-Hee
Chung Won-Ho
Kim Jong-Won
Hong Sung-Hwa
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Abstract
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Usher syndrome type II (USH2) is the most common form of Usher syndrome, characterized by moderate to severe hearing impairment and progressive visual loss due to retinitis pigmentosa. It has been shown that mutations in the USH2A gene are responsible for USH2. The authors herein describe a 34-year-old Korean woman with the typical clinical manifestation of USH2; she had bilateral hearing disturbance and progressive visual deterioration, without vestibular dysfunction. Molecular genetic study of the USH2A gene revealed a novel frameshift mutation (c.2310delA; Glu771LysfsX17). She was heterozygous for this mutation, and no other mutation was found in USH2A, suggesting the possibility of an intronic or large genomic rearrangement mutation. To the best of our knowledge, this is the first report of a genetically confirmed case of USH2 in Korea. More investigations are needed to delineate genotype-phenotype correlations and ethnicity-specific genetic background of Usher syndrome.
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KEYWORD
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Usher syndrome type II, USH2A, Mutation, Frameshift, Korea
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