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More global approaches have also been developed such as phage display technology Naz , Samoylova et al. Other important functions of epididymal proteins may be linked to molecular exchange or as carriers of hydrophobic components e. Download Figure.

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In view of the numerous changes visualized by specific labelling of the surface proteins during epididymal transit, many more proteins and their isoforms remain to be identified Fig. Such modifications occur for all the mammalian species, but the protein characteristics and the patterns of the sequential changes involved are different between species Fig. As most of these sperm modifications have never been successfully induced in vitro for testicular spermatozoa, their triggers may have an epididymal origin. Different types of methodologies have been used to identify sperm and epididymal proteins involved in sperm—egg membrane interactions.

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The cleaved peptides of these proteins are either relocated in different plasma membrane domains e. Cellular calcium levels have been reported to be six times higher in caput spermatozoa than in caudal spermatozoa, and the rate of calcium uptake in caput spermatozoa to be about two to three times higher than that in caudal spermatozoa Vijayaraghavan et al. The characterization of these modifications was first oriented to those directly involved in egg-binding and -fertilization ability of spermatozoa.