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Sequence variations in the mitochondrial DNA control region and their implications for the phylogeny of the Cypriniformes

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The mitochondrial DNA control region of six cobitids and two catostomids was sequenced and compared with sequences of other cypriniforms to study their sequence variations. The extended termination associated sequence (ETAS) domain, central domain, and conserved sequence block (CSB) domain were partitioned and the ETAS sequence, CSB-D, CSB-E, ECSB-F, CSB1, CSB2, and CSB3 were identified. It is suggested that the "hairpin" TACAT-ATGTA is the key sequence of ETAS and GACATA is the symbol of CSB1. Phylogenetic analysis based on the CSB domain showed that all cyprinids evolved as one monophyletic group, while the non-cyprinid Cypriniformes could be another monophyly that is in accordance with the hypothesis proposed by Siebert. Further analysis of the phylogeny of the Cobitoidei was also conducted and it is tentatively suggested that their relationships are Catostomidae + (Gyrinocheilidae + (Botiinae + (Homalopteridae + (Cobitinae + Nemacheilinae)))).

La région de contrôle de l'ADNmt de six cobitidés et deux catostomidés a été soumise à un séquençage et comparée aux séquences qui existent chez d'autres cypriniformes pour permettre l'étude de leurs variations. Le domaine étendu des séquences associées à la terminaison (ETAS), le domaine central et le domaine des blocs de séquences conservés (CSB) ont été partitionnés et la séquence d'ETAS, CSB-D, CSB-E, ECSB-F, CSB1, CSB2 et CSB3, a été identifiée. Il semble que la séquence en épingle à cheveux TACAT-ATGTA soit la séquence clé d'ETAS et GACATA, le symbole de CSB1. L'analyse phylogénétique du domaine CSB a démontré que tous les cyprinidés ont évolué comme groupe monophylétique et que les cypriniformes autres que les cyprinidés forment peut-être un autre groupe monophylétique, ce qui s'accorde avec l'hypothèse de Siebert. Une analyse subséquente de la phylogénie des Cobitoidei semble démontrer que leurs relations pourraient être les suivantes : Catostomidae + (Gyrinocheilidae + (Botiinae + (Homalopteridae + (Cobitinae + Nemacheilinae)))).[Traduit par la Rédaction]

Document Type: Research Article

Publication date: 2002-03-01

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