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Characterization and expression of cyp19a gene in the Chinese giant salamander Andrias davidianus

文献类型： 外文期刊

作者： Hu, Qiaomu 1 ; Xiao, Hanbing 1 ; Tian, HaiFeng 1 ; Meng, Yan 1 ;

作者机构： 1.Chinese Acad Fishery Sci, Yangtze River Fisheries Res Inst, Wudayuan First Rd 8, Wuhan 430223, Peoples R China

2.Chinese Acad Fishery Sci, Freshwater Fisheries Res Ctr, Wuxi 214081, Jiangsu, Peoples R China

关键词： Andrias davidianus;p450 aromatase;Gene expression;Methylation

期刊名称：COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY B-BIOCHEMISTRY & MOLECULAR BIOLOGY （ 影响因子：2.231； 五年影响因子：2.215 ）

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收录情况： SCI

摘要： We cloned the full length cyp19a of Chinese giant salamander Andrias davidianus, determined its distribution in tissues and developing gonads, and analyzed the CpG methylation pattern of the cyp19a promoter. The results revealed isoforms of 1706 bp (G arom) and 1698 bp (B arom) in length, differing in the 5' flanking region, both encoding 502 amino acids. The G arom gene was observed mainly in the ovary and kidney, with little in other investigated tissues, while B arom expression was high in the brain, ovary, testis, and pituitary, with low or undetected expression in other examined tissues. Total aromatase expression was high in the ovary; moderate in the kidney, brain, testis, and pituitary; and low in the remaining tissues. G arom expression was significantly higher in the ovary than in the testis and gradually decreased with maturation of the salamander. A single injection of methyltestosterone or letrozole resulted in ovarian G arom expression decreasing over a 12-96 h period. A 1366 bp sequence of the cyp19a promoter was cloned and shown to be conserved in selected species. CpG methylation level was negatively correlated with cyp19a expression in the examined tissues and developing ovaries. Five and three CpG methylation sites positively correlated with DNA methylation levels in tissues and developing ovary, suggesting that they play an important role in regulating cyp19a expression. The aromatase gene showed two isoforms with distinct expression patterns, and the promoter methylation level at specific CpG sites was associated with variation in expression profiles of tissues and developing ovaries. (C) 2015 Elsevier Inc All rights reserved.

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