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Phylogenetic analysis of Ciona intestinalis gene superfamilies supports the hypothesis of successive gene expansions

By Magalie Leveugle, Karine Prat, Cornel Popovici, Daniel Birnbaum and François Coulier


Understanding the formation of metazoan multigene families is a good approach to reconstitute the evolution of the chordate genome. In this attempt, the analysis of the genome of selected species provides valuable information. Ciona intestinalis belongs to the urochordates, whose lineage separated from the chordate lineage that later gave birth to vertebrates. We have searched available sequences from the small marine ascidian C. intestinalis for orthologs of members of five vertebrate superfamilies, including tyrosine kinase receptors, ETS, FOX and SOX transcription factors, and WNT secreted regulatory factors, and conducted phylogenetic analyses. We have found that most vertebrate subfamilies have a single C. intestinalis ortholog. Our results support the hypothesis of a gene expansion prior the base of chordate ancestry followed by another gene expansion during vertebrate evolution. They also indicate that Ciona intestinalis genome will be a very valuable tool for evolutionary analyses

Topics: Paralogy, Urochordates, Orthology, 2R hypothesis, Ciona intestinalis, Gene duplication, Genome
Publisher: HAL CCSD
Year: 2004
DOI identifier: 10.1007/s00239-003-2538-y
OAI identifier: oai:HAL:hal-00084044v1
Provided by: Hal-Diderot
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