Journal of Molecular Evolution

, Volume 67, Issue 3, pp 278–290 | Cite as

Oscheius tipulae as an Example of eEF1A Gene Diversity in Nematodes

Article

Abstract

We characterized four eEF1A genes in the alternative rhabditid nematode model organism Oscheius tipulae. This is twice the copy number of eEF1A genes in C. elegans, C. briggsae, and, probably, many other free-living and parasitic nematodes. The introns show features remarkably different from those of other metazoan eEF1A genes. Most of the introns in the eEF1A genes are specific to O. tipulae and are not shared with any of the other genes described in metazoans. Most of the introns are phase 0 (inserted between two codons), and few are inserted in protosplice sites (introns inserted between the nucleotide sequence A/CAG and G/A). Two of these phase 0 introns are conserved in sequence in two or more of the four eEF1A gene copies, and are inserted in the same position in the genes. Neither of these characteristics has been detected in any of the nematode eEF1A genes characterized to date. The coding sequences were also compared with other eEF1A cDNAs from 11 different nematodes to determine the variability of these genes within the phylum Nematoda. Parsimony and distance trees yielded similar topologies, which were similar to those created using other molecular markers. The presence of more than one copy of the eEF1A gene with nearly identical coding regions makes it difficult to define the orthologous cDNAs. As shown by our data on O. tipulae, careful and extensive examination of intron positions in the eEF1A gene across the phylum is necessary to define their potential for use as valid phylogenetic markers.

Keywords

eEF1A Nematoda Oscheius tipulae Caenorhabditis elegans Intron evolution 

Notes

Acknowledgments

We would like to thank Dr. Marie Anne Félix for the kind gift of the cDNA library of Oscheius tipulae (strain CEW1). We would also like to thank Drs. Jeffrey J. Shaw (Department of Parasitology, University of São Paulo) and Thomas Blumenthal (Department of Molecular, Cellular, and Developmental Biology, University of Colorado at Boulder) for commentary on the first draft of the manuscript. This work was supported by grants from FAPESP (Fundação de Amparo à Pesquisa do Estado de São Paulo, The State of São Paulo Research Foundation). R.N.A. was a FAPESP graduate fellow.

Supplementary material

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MOESM1 (DOC 315 kb)

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Copyright information

© Springer Science+Business Media, LLC 2008

Authors and Affiliations

  1. 1.Departmento de ParasitologiaInstituto de Ciências Biomédicas/Universidade de São PauloSao PauloBrazil

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