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

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 relationship...

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Bibliographic Details
Published in:Journal of genetics and genomics 2008-05, Vol.35 (5), p.285-290
Main Authors: Yu, Shuiyan, Zhang, Weiwei, Li, Ling, Huang, Huifang, Ma, Fei, Li, Qingwei
Format: Article
Language:English
Subjects:
Amino Acid Sequence
Animals
Evolution, Molecular
Gnathostomata
gnathostome
hagfish
Hagfishes - genetics
lamprey
Lampreys - genetics
Myxinidae
outgroups
Petromyzontidae
phylogenetic relationship
Phylogeny
Proteins - chemistry
Proteins - genetics
tree-making method
Vertebrates - genetics
七鳃鳗
基因分析
盲鳗
颌口类
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Summary: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.
ISSN:1673-8527
DOI:10.1016/S1673-8527(08)60041-7