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Scientists have contrived a way to revitalize human eggs using the mother’s genetic particles that normally go to waste, an advancement that may help women in their maternal age struggling with infertility treatments. The ‘waste’ DNA comes from small cells called polar bodies that form off eggs and contain the same genetic material as in a woman’s egg nucleus.

Scientists at Oregon Health and Science University (OHSU) and the Salk Institute for Biological Studies in the US successfully transplanted a polar body from a woman’s developing oocyte, the cellular beginning of an embryo, into the cytoplasm of a donor oocyte stripped of its nucleus. This means that women harbouring only a small number of eggs could potentially double or even triple the number of embryos created during IVF. The technique could be particularly significant for older women, as the number of eggs the body produces diminishes with age.

“We know that fertility declines as women get older. This is potentially a way to double the number of eggs we are able to get from one session of in vitro fertilisation,” said Shoukhrat Mitalipov, from OHSU.

When tested, it was found that 42 percent of the hybrid egg cells developed into embryos following fertilisation, while 75% of normal eggs did the same. Genetic tests suggested that the hybrid embryos were healthy.

“Although it was only possible to examine a limited number of lines, from the point of view of epigenomic profiles, the quality of polar body-derived embryonic cells looks quite promising,” said Joseph Ecker from Salk Institute.

By rescuing polar bodies that would otherwise simply bud off the developing oocyte, researchers were able to form additional oocytes genetically related to the mother through nuclear transfer.

When fertilised with sperm, the new oocytes developed into viable embryos. None of the embryos were implanted to carry out an actual pregnancy. “Normally, polar bodies disintegrate and disappear during egg development. We were able to recycle them. We hope that by doing this, we can double the number of patient eggs available for in vitro fertilisation,” said Hong Ma from OHSU.

Despite this, Professor Wells voiced concerns that the technique might not give older women the boost that the authors suggest.

Mutations in mitochondria can result in debilitating forms of disease in children. He thinks many of the new eggs produced this way wouldn’t form a normal embryo when fertilised.

The study was published in the journal Cell Stem Cell.

 

3 COMMENTS

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