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漳州西施舌线粒体基因组全序列:腔蛤蜊属存在新种的证据

DOI: 10.3969/j.issn.0253-4193.2013.03.024, PP. 204-214

Keywords: 西施舌,线粒体基因组,遗传差异,新种

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Abstract:

利用长PCR扩增漳州西施舌线粒体DNA(ZZ-mtDNA),用引物步移法测序,获得线粒体基因组DNA全序列,研究其基因组特点。结合双壳类49个物种线粒体全基因组,分析基因间核苷酸和蛋白质氨基酸序列的差异,构建系统进化树,探讨漳州西施舌系统演化地位。研究结果表明:漳州西施舌线粒体基因组DNA全长17199bp,A+T含量为64.2%,编码36个基因,其中12个蛋白质编码基因,22个转运RNA基因(tRNAs),2个核糖体RNA基因(lrRNA和srRNA),全部基因均位于重链上,tRNASer为单拷贝,tRNAMet为双拷贝;非编码区占10.9%(1882bp/17199bp),其中,主非编码区为882bp,与RZ-mtDNA主非编码区差异明显,另有一个较大(400bp)的非编码区为漳州西施舌特异性非编码区;以双壳纲帘蛤目文蛤属3种贝类、贻贝目贻贝属4种贝类、珍珠贝目牡蛎科的6种贝类为参照,对编码基因的核苷酸序列和蛋白质氨基酸序列进行差异分析显示,漳州西施舌与日照西施舌达到了种间差异水平。线粒体基因组编码的基因、tRNA组成、非编码区均揭示漳州西施舌是腔蛤蜊属的一个新种。

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