"This breaks down all the classic barriers in terms of sexual reproduction, with none of the problems of cloning."Ĭloning produces offspring from just one parent, raising genetic and ethical problems that are not raised by the laboratory cultivation of eggs and sperm - although the new work, in which embryonic stem cells spontaneously transformed themselves into eggs, raises issues of its own. "It's absolutely remarkable," said Lee Silver, a Princeton molecular biologist who specializes in reproductive ethics. That scenario raises difficult questions, including whether the second man would be recognized as the child's biological mother. If the science holds true in humans as in mice - and several scientists said they suspect it will - then a gay male couple might, before long, be able to produce children through sexual reproduction, with one man contributing sperm and the other fresh eggs bearing his own genes. The work undermines the standard model of parenthood because the scientists made egg cells not only from female cells, but also from male cells, indicating that even males have the biological capacity to make eggs. Scientists in Pennsylvania yesterday said they had turned ordinary mouse embryo cells into egg cells in laboratory dishes - an advance that opens the door to creating "designer" eggs from scratch and, if repeated with human cells, could blur the biological line between fathers and mothers. This was in the Washington Post today.ĭon't know how long the link is valid, so here's the text: Human reproduction may soon be possible using the genetic material from any two people, without sex, without cloning, and without regard to the gender of the parents.
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