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中华鳖Dmrt1基因在雄性性别分化中的功能分析

DOI: 10.1360/N052015-00169, PP. 881-889

Keywords: Dmrt1,性别分化,雄性,中华鳖,慢病毒载体

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Abstract:

在大部分脊椎动物中,Dmrt1基因在雄性性别决定和性腺分化中起重要的调控作用.本文通过慢病毒-Dmrt1-shRNA干扰和Dmrt1-OE过表达载体系统的构建,成功实现了Dmrt1基因在中华鳖胚胎发育过程中的高效异常表达,以探讨Dmrt1在中华鳖雄性性别分化中的功能.结果显示,经过Dmrt1-shRNA干扰处理后的ZZ胚胎,32.0%发育成雌性(生理)个体,而经过Dmrt1-OE过表达处理后,25.5%的ZW胚胎发育成雄性(生理)个体.苏木素/伊红(H&E)染色、qPCR和免疫组化分析表明,Dmrt1基因敲低后,ZZ胚胎性腺外形和组织结构明显雌性化,雄性特异性基因Amh和Sox9表达显著降低,雌性特异性基因Cyp19a1和Foxl2表达则显著上升,出现雄向雌的性逆转现象;而Dmrt1过表达后的ZW胚胎性腺则向睾丸分化,Amh和Sox9表达急剧上调,Cyp19a1和Foxl2表达显著下降,呈现雌转雄性逆转现象.上述研究表明,Dmrt1基因在中华鳖早期雄性性别形成过程中是必需的,且它的异位表达能够单独启动雄性分化,是中华鳖雄性性别分化的关键因子.

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