Genetics

Do ovaries continue to produce eggs during adulthood?

A compelling new genetic study tracing the origins of immature egg cells, or 'oocytes', from the embryonic period throughout adulthood adds new information to a growing controversy. The notion of a "biological clock" in women ...

Medical research

A molecular explanation for age-related fertility decline in women

(Medical Xpress)—Scientists supported by the National Institutes of Health have a new theory as to why a woman's fertility declines after her mid-30s. They also suggest an approach that might help slow the process, enhancing ...

Genetics

Human egg cells are imperfect surprisingly often

More than 7% of human oocytes contain at least one exchangeless chromosome pair, demonstrating a remarkably high level of meiotic recombination failure, finds a study appearing December 10 in the American Journal of Human ...

Genetics

Why does making new egg cells require so much cell death?

A highly detailed study of how the roundworm C. elegans forms oocytes suggests that the egg-making process leads to the formation and subsequent destruction of cells with an extra nucleus, but that some cellular materials ...

Obstetrics & gynaecology

ART live-birth rates can approach natural fecundity

(HealthDay) -- During assisted reproductive technology, increasing maternal age and number of cycles is linked to lower live-birth rates with the use of autologous oocytes, but not donor oocytes, according to a study published ...

Medical research

Building the ovarian environment from stem cells

Researchers led by Kyushu University have succeeded in using mouse stem cells to reconstruct structures in the ovarian environment critical for the generation of mature egg cells. Moreover, they were able to apply their findings ...

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