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Zoological Research
Kunming Institute of Zoology, Chinese Academy of Sciences
ISSN: 2095-8137
Vol. 30, No. 5, 2009, pp. 487-496
Bioline Code: zr09075
Full paper language: Chinese
Document type: Research Article
Document available free of charge

Zoological Research, Vol. 30, No. 5, 2009, pp. 487-496

 en Heteroplasmy in mtDNA Control Region and Phylogenetics of Five Sturgeons
Wang, Wei; Zhu, Hua; Hu, Hong-xia; Tian, Zhao-hui & Dong, Ying


The sequences of the control region (D-loop) of mitochondrial DNA (mtDNA) were obtained from five species of sturgeon. The sequences obtained had lengths between 795-813 bp. The motifs of the conserved sequence block (CBS) and termination-associated sequence (TAS) were identified in the sequences. Examination of the molecular phylogeny using maximum likelihood, maximum parsimony and Bayesian analysis shows that sturgeons form two clades representing biogeographic distribution, and the Huso is not monophyletic. Heteroplasmy in 150 fishes was due to a variable number of tandem repeats. Length of the central repeat units ranges from 78 to 82 bp with repeat sequence copies between four and six. The repeat units, followed by an imperfect repeat unit, are in high similarity between species, with 82.93% between Amur sturgeon and starlet and 90.59% between Siberian sturgeon and Russian sturgeon. Furthermore, comparing with other repeat sequences published, different species have the same repeat unit and intramolecular recombination event may happen in the repeat unit. All of these indicate that the repeat units are related to the evolution of sturgeon and arose prior to species divergence after which recombination happened.

Mitochondrial control region; Acipenser baerii; A. schrenckii; A. ruthenus; Huso dauricus; A. gueldenstaedtii; Tandem repeat; Heteroplasmy

© Copyright 2009 Kunming Institute of Zoology, the Chinese Academy of Sciences
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