Abstract
Little is known about the Hox gene complement in parasitic platyhelminthes (Neodermata). With the aim of identifying Hox genes in this group we performed two independent strategies: we performed a PCR survey with degenerate primers directed to the Hox homeobox in the cestode Mesocestoides corti, and we searched genomic assemblies of Echinococcus multilocularis and Schistosoma mansoni. We identified two Hox genes in M. corti, seven in E. multilocularis, and nine in S. mansoni (including five previously reported). The affinities of these sequences, and other previously reported Hox sequences from flatworms, were determined according to phylogenetic analysis, presence of characteristic parapeptide sequences, and unusual intron positions. Our results suggest that the last common ancestor of triclads and neodermatans had a Hox gene complement of at least seven genes, and that this was probably derived by gene loss from a larger ancestral Hox complement in lophotrochozoans.
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Acknowledgments
The authors thank Laura Dominguez and Jenny Saldaña for providing infected mice, and Madelón Portela for technical assistance and the Automatic Sequencing of the Faculty of Sciences. We are very grateful to the Echinococcus multilocularis and Schistosoma mansoni Sequencing Groups at the Sanger Institute for permitting us to work with the genomic assemblies, and to Najib M. El-Sayed (University of Maryland), and Klaus Brehm (Universität Würzburg). This work was supported by IFS, DINACYT, and a M.Sc. fellowship from PEDECIBA to A.I.L.
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Koziol, U., Lalanne, A.I. & Castillo, E. Hox Genes in the Parasitic Platyhelminthes Mesocestoides corti, Echinococcus multilocularis, and Schistosoma mansoni: Evidence for a Reduced Hox Complement. Biochem Genet 47, 100–116 (2009). https://doi.org/10.1007/s10528-008-9210-6
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DOI: https://doi.org/10.1007/s10528-008-9210-6