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Round spermatids have been used as substitute gametes in basic reproductive research and in infertility clinics. In humans, however, the efficiency of fertilization and pregnancy is generally much lower after round spermatid injection (ROSI) than after injection with mature sperm. We examined the ability of round spermatids to support embryonic development using a non-human primate as a model. We chose cynomolgus monkeys because, as in humans, their round spermatids have the oocyte-activating capacity of mature sperm.

human reproduction

Pregnancy by the tubal transfer of embryos developed after injection of round spermatids into oocyte cytoplasm of the cynomolgus monkey (Macaca fascicularis)