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草鱼PAX7基因的克隆、序列分析及组织表达

, PP. 152-158

Keywords: PAX7基因,草鱼,序列分析,组织差异表达

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Abstract:

配对盒基因7(Pairedbox7gene,PAX7)在神经嵴发育及原肠胚形成、肌肉自主更新与再生中扮演着重要角色,对细胞更新、分化、凋亡等起着十分重要的调控作用。参照GenBank中斑马鱼、线鳍电鳗和虹鳟等物种PAX7序列的保守区域设计简并引物,进行反转录PCR扩增,获得草鱼PAX7基因的部分序列,长645bp,编码214个氨基酸,包含编码128个氨基酸的PAX7蛋白配对框(PD)。氨基酸序列比对结果发现,草鱼PAX7基因与其他物种具有高度的相似性,与斑马鱼、线鳍电鳗、日本青鳉、金头鲷、虹鳟、大西洋鲑、北极嘉鱼、人、野牦牛、褐家鼠和小鼠的PAX7氨基酸序列同源性可达90%-97%;各物种PAX7部分氨基酸序列的系统进化树结果显示,草鱼与斑马鱼、日本青鳉、北极嘉鱼、大西洋鲑、虹鳟、线鳍电鳗和金头鲷聚为一大支,小鼠、褐家鼠,野牦牛与人类另聚一支,所得结果符合物种传统分类进化地位。运用实时荧光定量PCR检测草鱼PAX7基因在各组织中的差异表达,结果显示PAX7基因在肌肉中表达量最高;其次是前肠和皮肤,在心、脑、肾和肝中仅少量表达,所得结果与该基因的功能相一致。

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