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不同倍性鲤科鱼Cyclin B基因内含子克隆与进化分析

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摘要 运用PCR扩增、克隆、测序等技术,分别获得三倍体鲫鲂、四倍体鲫鲂、五倍体鲫鲂和团头鲂、草鱼、鲢鱼、鳙鱼等鲤科鱼Cyclin B基因部分DNA序列.结合异源四倍体鲫鲤及其原始亲本红鲫和鲤鱼Cyclin B基因对应DNA序列,对不同倍性鲤科鱼类Cyclin B基因DNA片段序列进行比较分析.结果表明:由相同引物扩增的染色体数为48的鲂、草、鲢、鳙鱼,只扩增出1条DNA片段,片段长度分别为750bp,950bp,720bp和720bp,而染色体数目加倍的红鲫、鲤鱼、异源四倍体鲫鲤、异源四倍体鲫鲂,扩增出2条DNA片段(1200bp和900bp),三倍体和五倍体鲫鲂扩增出3条DNA片段(1200bp,900bp和750bp),每个DNA片段均含Cyclin B基因第2,3内含子和第2,3,4外显子.序列分析表明,四倍体鲫鲤、三倍体鲫鲂、四倍体鲫鲂和五倍体鲫鲂与其母本1200bp片段同源性分别为99.5%,98.9%,99.5%和88.7%,与母本900bp片段同源性分别为97.5%,94.6%,94.2%和89.9%,说明四倍体鲫鲤与多倍体鲫鲂1200bp和900bpCyclin B基因片段与母本红鲫同源性高,在进化上具有偏母性遗传特性.而三倍体和五倍体鲫鲂的750bpCyclin B基因片段与父本同源性分别高达98.6%和98.2%,说明其来自父本团头鲂.在两性可育的异源四倍体鲫鲤和异源四倍体鲫鲂中存在各自父本Cyclin B基因片段序列消除现象.此外,用Cyclin B基因内含子3序列构建不同倍性鲤科鱼的系统进化树,结果表明,由Cyclin B基因内含子序列构建的系统进化树可以正确反映亲缘关系较近的鲤亚科属间鱼类系统进化关系,而不适合亲缘关系较远的亚科间杂交鱼类系统进化分析.
出处 《自然科学进展》 北大核心 2009年第6期611-618,共8页
基金 国家杰出青年科学基金(批准号:30725028) 国家重点基础研究发展计划(批准号:2007CB109200) 湖南省"芙蓉学者"特聘教授和湖南省教育厅产业化基金(批准号:200654-2)资助项目
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