Mutation c.359_363delGTATTinsATAC in the COL4A5 Causes alport syndrome in a Chinese family |
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| Authors: | Qiufen Wang Fei Liu Yue Xing Xianjin Wei Hui Li Shirong Zhang Jingyu Liu Qing Wang Zhaohui Tang Mugen Liu |
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| Affiliation: | 1. Key Laboratory of Molecular Biophysics of Ministry of Education, College of Life Science and Technology, Center for Human Genome Research, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China;2. Union Hospital, Huazhong University of Science and Technology, Wuhan, Hubei 430022, China;3. The Pinghu Traditional Chinese Medicine Hospital, Pinghu, Zhejiang, 314200, China |
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| Abstract: | The X-linked form of Alport syndrome is associated with mutations in the COL4A5 gene, which is located at Xq22.3 and encodes the α5 chain of type IV collagen. Here we clinically characterized a Chinese family with Alport Syndrome, but no ocular or hearing abnormalities have been observed in any patient in the family. Through Linkage analysis and direct DNA sequencing, a novel complex deletion/insertion mutation c.359_363delGTATTinsATAC in the COL4A5 gene was identified in the family. The mutation was found in all affected family members, but was not present in the unaffected family individuals or the 200 controls. The predicted mutant protein in the family is a truncated protein consisting of only 153 residues. Our report for the first time revealed that the frameshift mutation in the type IV collagen chain α5 causes only renal disease, without extrarenal lesion. Our study broadens genotypic and phenotypic spectrum of COL4A5 mutations associated with Alport syndrome. |
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| Keywords: | COL4A5, the α5 chain of type IV collagen AS, Aport syndrome XLAS, X-linked Alport syndrome COL4A3, the α3 chain of type IV collagen COL4A4, the α4 chain of type IV collagen ESRD, end-stage renal disease HGMD, the Human Gene Mutation Database NC I, non-collagenous domain I |
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