Identification of Hox Gene Sequences in the Sea Cucumber Holothuria glaberrima Selenka (Holothuroidea: Echinodermata) |
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Authors: | Ana T Méndez José L Roig-López Pedro Santiago Carlos Santiago José E García-Arrarás |
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Institution: | (1) Department of Biology, University of Puerto Rico, Rio Piedras, P.R. 00931, PR |
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Abstract: | The Echinodermata is a unique animal group forming an early branch in the deuterostomes phylogenetic tree. In echinoids and
asteroids a single Hox cluster with nine cognates of the vertebrate Hox paralogous groups has been reported, but no data are available from other echinoderm classes. We report here nine Hox-type sequences from the sea cucumber Holothuria glaberrima, a member of the class Holothuroidea. Partial homeodomain sequences were amplified by polymerase chain reaction from genomic
DNA and from a regenerating gastrointestinal tract complementary DNA library. Sequence analyses suggest that the holothuroid
cluster has at least three genes of the anterior, one of the medial, and five of the posterior groups. This is the first evidence
of five posterior sequences in echinoderms.
Received July 19, 1999; accepted October 18, 1999. |
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Keywords: | : Deuterostomes echinoderms holothuroids paralogous group partial homeodomain orthologues |
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