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Mouse Study Reveals New Secrets of Fertilization

British researchers discover receptors on egg cells that allow sperm to attach, fertilize egg

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An interesting feature of the Juno egg receptor, Wright said, is that it disappears within about 40 minutes after an egg is fertilized.

"We believe this is one of the ways in which eggs ensure that they fuse with one and only one sperm," he said. "That is, once the first sperm has fertilized the egg, the egg shuts down its ability to recognize additional sperm, ensuring that the fertilized egg doesn't contain too many chromosomes, which would result in a non-viable embryo."

Dr. Michael Heard, a reproductive endocrinologist at Houston Methodist Hospital in Texas, lauded the new research as "very interesting" and said the findings hold promise for future fertility treatments and contraceptives.

"A male contraceptive is still on the back burner. If they could inhibit those [Izumo1 sperm] receptors so they wouldn't fertilize the eggs at all, with a high percentage of reliability, that would be great," said Heard, who wasn't involved in the study.

Scientists note that research involving animals often fails to provide similar results in humans.

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