The putative chaperone calmegin is required for sperm fertility

Article Abstract:

Calmegin, a testis-specific endoplasmic reticulum protein which is homologous to calnexin, acts as a chaperone for one or more sperm surface proteins which control the interactions between sperm and egg. Research indicates that calmegin may be expressed during spermatogenesis to ensure the full maturation of particular sperm surface proteins which are necessary for egg binding. This research was undertaken on mice, but may be significant for the study of unexplained infertility in men.

Spermatogenesis, Infertility, Male, Male infertility

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Fertilization without sperm

Article Abstract:

Intracytoplasmic sperm injection (ISCI) is a new assisted-conception technique that uses spermatozoa from the testes of men with abnormal reproductive capabilities to fertilize eggs. The use of the technique on people producing very low numbers of spermatozoa shows good results. Immature spermatozoa also initiates normal pregnancies when injected into the oocyte. However, the use of ISCI will probably result in the transmission of genes that produce genetically related complications.

Innovations, Fertilization in vitro, Human, Human fertilization in vitro, Artificial insemination

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Cuckoldry through stored sperm in the sequentially polyandrous spotted sandpiper

Article Abstract:

A study of mating behavior among polyandrous spotted sandpipers (Actitis macularia) found that the females' ability to retain the sperm of previous mates for more than a month enabled early-pairing males to enhance their reproductive success by cuckolding the females' later mates. The early-pairing males achieve this by being able to fertilize eggs laid for, and kept warm by, their females' later mates.

Behavior, Sexual behavior in animals, Animal sexual behavior, Sandpipers

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