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The carp-goldfish nucleocytoplasmic hybrid has mitochondria from the carp as the nuclear donor species

文献类型： 外文期刊

作者： Hu Guangfu 1 ; Zou Guiwei 1 ; Liu Xiangjiang 2 ; Liang Hongwei 1 ; Li Zhong 1 ; Hu Shaona 1 ;

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

2.Huazhong Agr Univ, Coll Fisheries, Wuhan 430070, Peoples R China

关键词： Carassius auratus;CyCa hybrid;Cyprinus carpio var. wuyuanensis;MtDNA;Nuclear transfer

期刊名称：GENE （ 影响因子：3.688； 五年影响因子：3.329 ）

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收录情况： SCI

摘要： It is widely accepted that mitochondria and its DNA (mtDNA) exhibit strict maternal inheritance, with sperm contributing no or non-detectable mitochondria to the next generation. In fish, nuclear transfer (NT) through the combination of a donor nucleus and an enucleated oocyte can produce fertile nucleocytoplasmic hybrids (NCHs) even between different genera and subfamilies. One of the best studied fish NCHs is CyCa produced by transplanting the nuclei plus cytoplasm from the common carp (Cyprinus carpio var. wuyuanensis) into the oocytes of the wild goldfish (Carassius auratus), which has been propagated by self-mating for three generations. These NCH fish thus provide a unique model to study the origin of mitochondria. Here we report the complete mtDNA sequence of the CyCa hybrid and its parental species carp and goldfish as nuclear donor and cytoplasm host, respectively. Interestingly, the mtDNA of NCH fish CyCa is 99.69% identical to the nuclear donor species carp, and 89.25% identical to the oocyte host species goldfish. Furthermore, an amino acid sequence comparison of 13 mitochondrial proteins reveals that CyCa is 99.68% identical to the carp and 87.68% identical to the goldfish. On an mtDNA-based phylogenetic tree, CyCa is clustered with the carp but separated from the goldfish. A real-time PCR analysis revealed the presence of carp mtDNA but the absence of goldfish mtDNA. These results demonstrate - for the first time to our knowledge - that the mtDNA of a NCH such as CyCa fish may originate from its nuclear donor rather than its oocyte host.

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