Document Detail

Cross-fertilization between Syrian and Chinese hamsters.
MedLine Citation:
PMID:  2760577     Owner:  NLM     Status:  MEDLINE    
The role of the zona pellucida in the specificity of fertilization was studied by cross-inseminations between Syrian (Golden) and Chinese hamster gametes. Cumulus-enclosed eggs from both Syrian and Chinese hamsters were placed together in one dish and inseminated with spermatozoa from either one or the other species. Fertilization always took place between gametes of homologous species. Chinese hamster spermatozoa failed to bind to the zona pellucida of Syrian hamster eggs; hence, fertilization was never observed. However, Chinese hamster spermatozoa could fertilize zona-free Syrian hamster eggs. In the reciprocal cross, a large number of Syrian hamster spermatozoa could bind to and penetrate the zonae of Chinese hamster eggs. However, fusion of Syrian hamster spermatozoa with the vitellus of zona-intact Chinese hamster eggs was never observed. After removal of the zona pellucida, only a small percentage (31%) of Syrian hamster spermatozoa could fuse with Chinese hamster vitelli. Thus, in these species, the mechanisms of interspecific gamete recognition and the prevention of interspecies fertilization seem to differ according to the direction of the cross. In Syrian hamster eggs, the block to interspecies fertilization seems to exist at the level of the zona pellucida, while in Chinese hamster eggs the block is at the level of the egg plasma membrane. The implications of these results in analyses of the genetics of spermatozoa, the molecular basis of sperm-egg recognition, and mechanisms of reproductive isolation leading to speciation, are discussed.
E R Roldan; R Yanagimachi
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  The Journal of experimental zoology     Volume:  250     ISSN:  0022-104X     ISO Abbreviation:  J. Exp. Zool.     Publication Date:  1989 Jun 
Date Detail:
Created Date:  1989-09-12     Completed Date:  1989-09-12     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  0375365     Medline TA:  J Exp Zool     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  321-8     Citation Subset:  IM    
Department of Anatomy and Reproductive Biology, University of Hawaii, School of Medicine, Honolulu 96822.
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MeSH Terms
Cricetinae / physiology*
Cricetulus / physiology*
Mesocricetus / physiology*
Ovum / physiology*
Sperm-Ovum Interactions*
Zona Pellucida / physiology*
Grant Support

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