Abstract
Studies of DNA polymorphism have shown that some immune system genes of mammals and plants are exceptionally diverse, indicating that coevolution between these taxa and their parasites mediates positive selective sweeps and/or balancing selection. The genes of the arthropod immune system remain comparatively unstudied. We isolated two putative immune system genes from the cladoceran crustacean Daphnia and examined DNA sequence diversity. For one gene, encoding a putative gram-negative binding protein, we found evidence of only purifying selection, indicating that this gene is under strong functional constraint and that selection acts to eliminate amino acid variation. For another gene, encoding a putative α-2-macroglobulin, we found evidence of positive selection, indicating the possible involvement of this gene in a host–parasite arms race. We discuss the assumed function of these genes and offer speculation regarding which components of the arthropod immune system might experience diversifying adaptive evolution.
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Acknowledgments
Thanks to Mike Lynch and members of the Lynch Lab (Eugene and Bloomington) for assisting TL during the early phase of this work. In Edinburgh, laboratory support was provided by Andrew Read, Brian Chan, Josephine Pemberton, and members of Pemberton lab. This work was financially supported by The Wellcome Trust UK and by the School of Biology, University of Edinburgh. Peter Andolfatto, Brian Charlesworth, Stephen Wright, Mark Blaxter, and Francis Jiggins offered advice on a draft version of this paper. All authors acknowledge the assistance of the Daphnia Genomics Consortium framework. A2M sequences used in this study correspond to GenBank accession numbers AY540086–AY540100, and GNBP sequences used in this study correspond to GenBank accession numbers AY540101–AY540103.
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Little, T.J., Colbourne, J.K. & Crease, T.J. Molecular Evolution of Daphnia Immunity Genes: Polymorphism in a Gram-Negative Binding Protein Gene and an α-2-Macroglobulin Gene. J Mol Evol 59, 498–506 (2004). https://doi.org/10.1007/s00239-004-2641-8
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DOI: https://doi.org/10.1007/s00239-004-2641-8