Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/43991
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Type: Journal article
Title: Molecular evolution of the carboxy terminal region of the zona pellucida 3 glycoprotein in murine rodents
Author: Swann, C.
Cooper, S.
Breed, W.
Citation: Reproduction, 2007; 133(4):697-708
Publisher: Bio Scientifica Ltd
Issue Date: 2007
ISSN: 1470-1626
1741-7899
Statement of
Responsibility: 
Christine A Swann, Steven J B Cooper and William G Breed
Abstract: In mammals, before fertilization can occur, sperm have to bind to, and penetrate, the zona pellucida (ZP). In the laboratory mouse, which has been used as a model system for fertilization studies, sperm-ZP binding has been found to be mediated by a region at the carboxy terminal, encoded by exon 7 of the Zp3 gene. This region shows considerable interspecific sequence diversity with some evidence of adaptive evolution in mammals, suggesting that it may contribute to species-specific sperm-ZP binding. However, in a previous study of sequence diversity of ZP3 of three species of Australian murine rodents, we found an identical protein sequence of the region encoded by exon 7. Here, we expand this earlier study to determine the sequence diversity of this region in 68 out of the 130 species of Australasian murine rodents. Maximum likelihood analyses, using representatives of both New Guinean and Australian taxa, provide evidence of positive selection at three codons adjacent to, or within, the putative combining-site for sperm of ZP3, but this was not evident when the analysis was restricted to the Australian taxa. The latter group showed low levels of both intra- and inter-generic sequence divergences in the region encoded by exon 7 of Zp3, with little evidence that this region contributes to species specificity of sperm-ZP binding. These findings suggest that the selective forces acting on the Zp3 exon 7 region during the evolution of the Australasian murine rodents have been variable, and that positive selection has only occurred in a few lineages.
Keywords: Animals; Rodentia; Mice; Rats; Egg Proteins; Membrane Glycoproteins; Receptors, Cell Surface; Sequence Analysis, DNA; Evolution, Molecular; Species Specificity; Base Sequence; Protein Structure, Tertiary; Sperm-Ovum Interactions; Exons; Molecular Sequence Data; Australia; Oceania; Female; Selection, Genetic; Zona Pellucida Glycoproteins
Description: Copyright © 2007 Society for Reproduction and Fertility
RMID: 0020070956
DOI: 10.1530/REP-06-0043
Published version: http://www.reproduction-online.org/cgi/content/abstract/133/4/697
Appears in Collections:Anatomical Sciences publications
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