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He and others also said society will have to decide how much government regulation would be needed, both for the initial research in humans and its routine use by doctors.
For example, the new work moves scientists closer to the possibility of tinkering with genes that would affect not only one person but also be inherited by future generations, which has long been controversial, said Dr. George Daley of the Harvard Stem Cell Institute. And basic research with such eggs could mean making and destroying human embryos in the lab, which many people oppose.
More controversy could arise over using the method for women who are infertile simply because of their age.
"Society is not clear about how it feels about older women having children," said Josephine Johnston of the Hastings Center, a bioethics research institute in Garrison, N.Y. She said there has been no sustained public discussion of "how old is too old, and what does that even mean."
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