Five novel mutations in the ADAR1 gene associated with dyschromatosis symmetrica hereditaria

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• 作者：Qi Liu ; Zhen Wang ; Yuhong Wu ; Lihua Cao ; Qingzhu Tang ; Xuesha Xing…
• 关键词：Dyschromatosis symmetrica hereditaria ; ADAR1 ; in vivo mRNA assay ; Exonic splicing mutation ; in vitro expression assay
• 刊名：BMC Medical Genetics
• 出版年：2014
• 出版时间：December 2014
• 年：2014
• 卷：15
• 期：1
• 全文大小：1,804 KB
• 参考文献：1. Miyamura, Y, Suzuki, T, Kono, M, Inagaki, K, Ito, S, Suzuki, N, Tomita, Y (2003) Mutations of the RNA-specific adenosine deaminase gene (DSRAD) are involved in dyschromatosis symmetrica hereditaria. Am J Hum Genet 73: pp. 693-699 CrossRef
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  15. Kantaputra
• 刊物主题：Human Genetics; Genetics and Population Dynamics;
• 出版者：BioMed Central
• ISSN：1471-2350

文摘

Background Dyschromatosis symmetrica hereditaria (DSH) is an autosomal dominantly inherited skin disease associated with mutations of ADAR1, the gene that encodes a double-stranded RNA-specific adenosine deaminase. The purpose of this study was to investigate the potential mutations in ADAR1 in seven Chinese families with DSH. Methods All the coding exons including adjacent intronic as well as 5-and 3-untranslated region (UTR) of ADAR1 were screened by direct sequencing. Moreover, quantitative reverse-transcription polymerase chain (qRT-PCR) and Western blot were applied to determine the pathogenic effects associated with the mutations. Results Molecular genetic investigations detected five novel mutations (c.556C-?T, c.3001C-?T, c.1936_1937insTG, c.1065_1068delGACA and c.1601G-?A resulting in p.Gln186X, p.Arg1001Cys, p.Phe646LeufsX16, p.Asp357ArgfsX47 and p.Gly471AspfsX30 protein changes, respectively) as well as two previously reported (c.2744C-?T and c.3463C-?T causing p.Ser915Phe and p.Arg1155Trp protein changes, respectively). Among them, we found that the substitution c.1601G-?A at the last nucleotide of exon 2 compromised the recognition of the splice donor site of intron 2, inducing an aberrant transcript with 190-bp deletion in exon 2 and causing an approximately 50% reduction of ADAR1 mRNA level in affected individual. In addition, consistent with the predicted results, the expression patterns of other novel mutations were detected by Western blot. Conclusion We identified five novel and two recurrent mutations of the ADAR1 gene in seven Chinese families with DSH and investigated potential effects of the novel mutations in this study. Our study expands the database on mutations of ADAR1 and for the first time, demonstrates the importance of exonic nucleotides at exon-intron junctions for ADAR1 splicing.