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Isolation of Hox and Parahox genes in the hemichordate Ptychodera flava and the evolution of deuterostome Hox genes.

Abstract：

:Because of their importance for proper development of the bilaterian embryo, Hox genes have taken center stage for investigations into the evolution of bilaterian metazoans. Taxonomic surveys of major protostome taxa have shown that Hox genes are also excellent phylogenetic markers, as specific Hox genes are restricted to one of the two great protostome clades, the Lophotrochozoa or the Ecdysozoa, and thus support the phylogenetic relationships as originally deduced by 18S rDNA studies. Deuterostomes are the third major group of bilaterians and consist of three major phyla, the echinoderms, the hemichordates, and the chordates. Most morphological studies have supported Hemichordata+Chordata, whereas molecular studies support Echinodermata+Hemichordata, a clade known as Ambulacraria. To test these competing hypotheses, complete or near complete cDNAs of eight Hox genes and four Parahox genes were isolated from the enteropneust hemichordate Ptychodera flava. Only one copy of each Hox gene was isolated suggesting that the Hox genes of P. flava are arranged in a single cluster. Of particular importance is the isolation of three posterior or Abd-B Hox genes; these genes are only shared with echinoderms, and thus support the monophyly of Ambulacraria.

journal_name

Mol Phylogenet Evol

journal_title

Molecular phylogenetics and evolution

authors

Peterson KJ

doi

10.1016/j.ympev.2003.10.007

keywords:

subject

Has Abstract

pub_date

2004-06-01 00:00:00

pages

1208-15

issue

3

eissn

1055-7903

issn

1095-9513

pii

S1055790303003907

journal_volume

31

pub_type

杂志文章

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