Fertility hope with stem-cell eggs

TOKYO—Hopes of a cure for infertility in humans were raised on Friday after Japanese stem-cell researchers announced they had created viable eggs using normal cells from adult mice.

The breakthrough raises the possibility that women who are unable to produce eggs naturally could have them created in a test tube from their own cells and then planted back into their body.

A team at Kyoto University harvested stem cells from mice and altered a number of genes to create cells very similar to the primordial germ cells that generate sperm in men and oocytes—or eggs—in women.

They then nurtured these with cells that would become ovaries and transplanted the mixture into living mice, where the cells ma- tured into fully grown oocytes.

They extracted the matured oocytes, fertilized them in vitro—in a test tube—and implanted them into surrogate mother mice.

The resulting mice pups were born healthy and were even able to reproduce once they matured.

Writing in the US journal Science, which published the findings, research leader professor Michinori Saito said the work provided a promising basis for hope in reproductive medicine.

“Our system serves as a robust foundation to investigate and further reconstitute female germline development in vitro, not only in mice, but also in other mammals, including humans,” he said.