Japanese researchers announced last year that healthy fertile mice had been born using eggs created from male mice's tail-tip cells. The male-derived eggs were fertilized with regular sperm, thus producing pups with two fathers. Reproductive biologist Katsuhiko Hayashi, who led the work at Kyushu University, thinks that it will be technically possible to create a viable human egg from a male skin cell within a decade, according to The Guardian.
This achievement builds on earlier work in which another team of Japanese researchers created mouse eggs from tail-tip cells that resulted in the birth of healthy offspring in 2017. Another Japanese research group in 2021 using mouse stem cells created sperm that produced healthy fertile offspring.
