Effect of a partial deletion of Y chromosome on in vitro fertilizing ability of mouse spermatozoa

M. Xian, S. Azuma, K. Naito, T. Kunieda, K. Moriwaki, Y. Toyoda

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33 Citations (Scopus)


The effect of a partial deletion of Y chromosome on sperm fertilizing ability was investigated through an in vitro fertilization technique. Epididymal spermatozoa of a congenic line, B10.BR-Y(del), which is characterized by a high incidence of abnormal spermatozoa, revealed a significantly lower in vitro fertilization rate (22%) than that (79%) of its control strain (B10.BR/SgSn), which has a normal-sized Y chromosome. Incidence of capacitated spermatozoa as determined by chlortetracycline fluorescence assay was significantly lower in B10.BR-Y(del) than in B10.BR/SgSn spermatozoa. The fertilization rate was significantly improved when B10.BR-Y(del) spermatozoa were separated from the supernatant of sperm suspension by Percoll gradient centrifugation. A reconstitution experiment revealed that the B10.BR-Y(del) spermatozoa were more sensitive to the inhibitory effect of the supernatant than B10.BR/SgSn spermatozoa. Spermatozoa from F1 (C57BL/6N male x B10.BR-Y(del) female) males showed higher fertilization rates than those from F1 (B10.BR-Y(del) male x C57BL/6N female) males. These observations suggest that not only the morphology but also the fertilizing ability of spermatozoa is directly related to partial deletion of Y chromosome.

Original languageEnglish
Pages (from-to)549-553
Number of pages5
JournalBiology of reproduction
Issue number4
Publication statusPublished - 1992

ASJC Scopus subject areas

  • Reproductive Medicine
  • Cell Biology


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