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The use of immature male germ cells to fertilize human oocytes raises several questions. Spermatozoa are normally quiescent, but many genes are transcribed post-meiotically in round spermatids. This creates a novel situation for the oocyte. We have therefore explored the effects on early embryonic development of introducing a fully transcriptionally active round spermatid into the oocyte.

Differential gene expression in pre-implantation embryos from mouse oocytes injected with round spermatids or spermatozoa