HOX Genes in the Sepiolid Squid Euprymna scolopes: Implications for the Evolution of Complex Body Plans

Molluscs display a rich diversity of body plans ranging from the wormlike appearance of aplacophorans to the complex body plan of the cephalopods with highly developed sensory organs, a complex central nervous system, and cognitive abilities unrivaled among the invertebrates. The aim of the current...

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Published in:Proceedings of the National Academy of Sciences - PNAS 2002-02, Vol.99 (4), p.2088-2093
Main Authors: Callaerts, Patrick, Lee, Patricia N., Hartmann, Britta, Farfan, Claudia, Darrett W. Y. Choy, Ikeo, Kazuho, Fischbach, Karl-Friedrich, Gehring, Walter J., de Couet, H. Gert
Format: Article
Language:English
Subjects:
Amino Acid Sequence
Amino acids
Anatomy & physiology
Animals
Biological Sciences
Cephalopods
Cloning, Molecular
Complementary DNA
DNA - metabolism
DNA Primers - pharmacology
DNA, Complementary - metabolism
Drosophila
Euprymna scolopes
Evolution
Genes
Genes, Homeobox
Genomics
HOX gene
Molecular Sequence Data
Mollusca
Mollusks
Phylogenetics
Phylogeny
Polymerase Chain Reaction
Post gene
RNA - metabolism
Sequence Homology, Amino Acid
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creator Callaerts, Patrick
Lee, Patricia N.
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Farfan, Claudia
Darrett W. Y. Choy
Ikeo, Kazuho
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Gehring, Walter J.
de Couet, H. Gert
description Molluscs display a rich diversity of body plans ranging from the wormlike appearance of aplacophorans to the complex body plan of the cephalopods with highly developed sensory organs, a complex central nervous system, and cognitive abilities unrivaled among the invertebrates. The aim of the current study is to define molecular parameters relevant to the developmental evolution of cephalopods by using the sepiolid squid Euprymna scolopes as a model system. Using PCR-based approaches, we identified one anterior, one paralog group 3, five central, and two posterior group Hox genes. The deduced homeodomain sequences of the E. scolopes Hox cluster genes are most similar to known annelid, brachiopod, and nemertean Hox gene homeodomain sequences. Our results are consistent with the presence of a single Hox gene cluster in cephalopods. Our data also corroborate the proposed existence of a differentiated Hox gene cluster in the last common ancestor of Bilaterians. Furthermore, our phylogenetic analysis and in particular the identification of Post-1 and Post-2 homologs support the Lophotrochozoan clade.
doi_str_mv 10.1073/pnas.042683899
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source JSTOR Archival Journals and Primary Sources Collection; PubMed Central
subjects Amino Acid Sequence
Amino acids
Anatomy & physiology
Animals
Biological Sciences
Cephalopods
Cloning, Molecular
Complementary DNA
DNA - metabolism
DNA Primers - pharmacology
DNA, Complementary - metabolism
Drosophila
Euprymna scolopes
Evolution
Genes
Genes, Homeobox
Genomics
HOX gene
Molecular Sequence Data
Mollusca
Mollusks
Phylogenetics
Phylogeny
Polymerase Chain Reaction
Post gene
RNA - metabolism
Sequence Homology, Amino Acid
title HOX Genes in the Sepiolid Squid Euprymna scolopes: Implications for the Evolution of Complex Body Plans
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