Phylogenetic analysis of 48 gene families revealing relationships between Hagfishes, Lampreys, and Gnathostomata

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Institute of Marine Genomics & Proteomics, Liaoning Normal University, Dalian 116029, China
b.
Department of Medical Genetics, China Medical University, Shenyang 110001, China

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Corresponding author: E-mail address: liqw@263.net (Qingwei Li)

摘要

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Abstract: It has become clear that the extant vertebrates are divided into three major groups, that is, hagfishes, lampreys, and jawed vertebrates. Morphological and molecular studies, however, have resulted in conflicting views with regard to their interrelationships. To clarify the phylogenetic relationships between them, 48 orthologous protein-coding gene families were analyzed. Even as the analysis of 34 nuclear gene families supported the monophyly of cyclostomes, the analysis of 14 mitochondrial gene families suggested a closer relationship between lampreys and gnathostomes compared to hagfishes. Lampreys were sister group of gnathostomes. The results of this study supported the cyclostomes. Choice of outgroup, tree-making methods, and software may affect the phylogenetic prediction, which may have caused much debate over the subject. Development of new methods for tackling such problems is still necessary.
- phylogenetic relationship /
- hagfish /
- lamprey /
- gnathostome /
- outgroups /
- tree-making method

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