Evolutionary implications of dipluran hexamerins

Hexamerin, as a member of the highly conserved arthropod hemocyanin superfamily, has been shown to be a good marker for the phylogenetic study of insects. However, few studies have been conducted on hexamerins in basal hexapods. The first Diplura hexamerin CspHex1 was reported only recently (Pick an...

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Bibliographic Details
Published in:Insect biochemistry and molecular biology 2014-03, Vol.46, p.17-24
Main Authors: Xie, Wei, Luan, Yun-Xia
Format: Article
Language:English
Subjects:
Amino Acid Sequence
Animals
Arthropod Proteins - genetics
Arthropod Proteins - metabolism
Arthropods - classification
Arthropods - genetics
Arthropods - metabolism
Diplura
Evolution, Molecular
Hemocyanin
Hemocyanins - genetics
Hemocyanins - metabolism
Hexamerin
Insect Proteins - genetics
Insect Proteins - metabolism
Insecta
Insecta - genetics
Insecta - metabolism
Molecular Sequence Data
Phylogeny
Sequence Alignment
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Summary:Hexamerin, as a member of the highly conserved arthropod hemocyanin superfamily, has been shown to be a good marker for the phylogenetic study of insects. However, few studies have been conducted on hexamerins in basal hexapods. The first Diplura hexamerin CspHex1 was reported only recently (Pick and Burmester, 2009). Remarkably, CspHex1 was suggested to have evolved from hexapod hemocyanin subunit type 2, which is very different from all insect hexamerins originated from hexapod hemocyanin subunit type 1. Does this finding suggest double or even multiple origins of hexamerins in Hexapoda? To find more evidence on the evolution of dipluran hexamerins, eight putative hexamerin gene sequences were obtained from three dipluran species, as were three hemocyanin genes from two collembolan species. Unexpectedly, after adding the new sequences into the phylogenetic analyses, all dipluran hexamerins including CspHex1 grouped together and as sister to the insect hexamerins, with high likelihood and Bayesian support. Our analysis supports a single origin of the hexamerins in Hexapoda, and suggests the close relationship between Diplura and Insecta. In addition, our study indicates that a relatively comprehensive taxa sampling is essential to solve some problems in phylogenetic reconstruction. [Display omitted] •We report eight hexamerin gene sequences from three dipluran species.•We propose a new view on the evolution of dipluran hexamerins.•The results indicate the monophyletic origin of hexapod hexamerins.•The results support the close relationship between Diplura and Insecta.•The study suggests the significance of comprehensive data in phylogenetic inference.
ISSN:0965-1748
1879-0240
DOI:10.1016/j.ibmb.2014.01.003