Sequence Comparison of Partial Cytochrome b Genes of Two Coilia species  

作　　者：GAOTianxiang WANGYujiang ZHANGYaping 

机构地区：[1]TheKeyLaboratoryofMariculture,MinistryofEducation,OceanUniversityofChina,Qingdao266003,P.R.China [2]LaboratoryofMolecularEvolutionandGenomeDiversity,KunmingInstituteofZoology,ChineseAcademyofSciences,Kunming650223,P.R.China

出　　处：《Journal of Ocean University of China》2005年第1期85-88,共4页中国海洋大学学报（英文版）

基　　金：the Major State Basic Research Development Program(G19990437).

摘　　要：Sequence variation of partial cytochrome b genes between two Coilia species, C. ectenes and C. mystus, was in- vestigated. Of the 402 nucleotides, twenty-seven (6.72%) are polymorphic and all are synonymous substitutions. At the third positions of genetic condon of cytochrome b gene, the two species show an extreme anti-G bias (<4%) and a pronounced bias towards A and C (>68%). There is no amino acid sequence divergence between the partial cytochrome b genes of the two species, indicating a close genetic relationship between them. The k-2p genetic distance of partial cytochrome b segment of the two species is 0.072, suggesting that the species were separated 3.6 Ma ago, in the middle Pliocene. Our result reveals that the cytochrome b gene is an appropriate marker for studies of population genetic structures and phylogeographic pat- terns of the two species.Sequence variation of partial cytochrome b genes between two Coilia species, C. ectenes and C. mystus, was in- vestigated. Of the 402 nucleotides, twenty-seven (6.72%) are polymorphic and all are synonymous substitutions. At the third positions of genetic condon of cytochrome b gene, the two species show an extreme anti-G bias (<4%) and a pronounced bias towards A and C (>68%). There is no amino acid sequence divergence between the partial cytochrome b genes of the two species, indicating a close genetic relationship between them. The k-2p genetic distance of partial cytochrome b segment of the two species is 0.072, suggesting that the species were separated 3.6 Ma ago, in the middle Pliocene. Our result reveals that the cytochrome b gene is an appropriate marker for studies of population genetic structures and phylogeographic pat- terns of the two species.

关 键 词：cytochrome b gene genetic variation mitochondrial DNA Coilia ectenes Coilia mystus 

分 类 号：Q959.4[生物学—动物学] Q785