MBE Advance Access published online on March 10, 2004
Molecular Biology and Evolution, doi:10.1093/molbev/msh111
Molecular Biology and Evolution © Society for Molecular Biology and Evolution 2004; all rights reserved
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1 Department of Biological Anthropology, University of Oxford, 58 Banbury Road, Oxford, OX2 6QS
* To whom correspondence should be addressed. E-mail: nim21{at}cam.ac.uk.
CD45, encoded by PTPRC in humans, is the most abundantly expressed protein on the surface of many lymphocytes. We investigated whether the extracellular region of CD45 was under positive selection in Old World primates, and whether there was differential selection across this region, particularly on exons that were involved in alternative splicing and those that were not alternatively spliced. The results show extraordinarily strong and consistent positive Darwinian selection on the extracellular part of CD45 throughout the evolution of Old World monkeys, apes and humans. Positive selection is concentrated in exons 9 and 14, which code for the previously neglected linker and fibronectin III domains. These exons have a high rate of evolution at non-synonymous sites that is roughly twice as high as that of the intronic rate in this gene. In contrast, alternatively spliced exons 4 to 6, which code for the variable domains, are under weaker positive selection, and are evolving more slowly than the intronic rate. These data provide a striking example of positive selection in a well-known gene that should provide an impetus for further functional studies to elucidate its species-specific function. Key Words:
positive selection, lymphocyte, immune system, PTPRC
© 2004 Molecular Biology and Evolution © Society for Molecular Biology and Evolution 2004; all rights reserved.
Original Articles
Rapid Evolution by Positive Darwinian Selection in the Extracellular Domain of the Abundant Lymphocyte Protein CD45 in Primates
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