infertility

When patients come to Dr. Molly Quinn for infertility treatments, they usually aren't too interested in hearing about the possible downsides, she says. They just want to get pregnant.

For the first time, scientists have edited the DNA in human embryos to make a fundamental discovery about the earliest days of human development.

By modifying a key gene in very early-stage embryos, the researchers demonstrated that a gene plays a crucial role in making sure embryos develop normally, the scientists say.