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Light micrograph of human ovum egg and sperm. The ovum is much larger than the sperm and is surrounded by protective cumulus cells around the outside surface yellow. The membrane surrounding the ovum brown is the zona pellucida. The head of the sperm carries special enzymes to dissolve the zona pellucida, which is required in order to fertilise the egg. This image was taken from a failed human IVF procedure.
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Researchers at Karolinska Institutet in Sweden have obtained the first 3D snapshots of a sperm protein attached to a complementary egg coat protein at the beginning of fertilisation. The study, which reveals a common egg protein architecture that is involved in the interaction with sperm in both mollusc and mammal, is published in the respected scientific journal Cell. By transmitting the genetic information to the next generation and marking the beginning of a new life, the encounter between female and male gametes at fertilisation is one of the most fundamental processes in biology. Although egg and sperm were first observed centuries ago, how sperm recognises the coat of the egg and penetrates it has remained unknown. Using X-ray crystallographic data collected at the European Synchrotron Radiation Facility ESRF , Luca Jovine's research team at Karolinska Institutet first visualised the sperm-interacting regions of two egg coat proteins, ZP2 in mammals including humans and VERL in the marine mollusc abalone a classic model system of invertebrate fertilisation.
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He also postulated a new theory of infertility based on centrosome function and dysfunction in human embryos in , which postulated that poorly motile sperm produce poor embryos. This theory is currently gaining world-wide acceptance. Sathananthan has also contributed to eight world's firsts in IVF and assisted reproduction.

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Comments (12)

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