In September, reproductive endocrinologist John Zhang and his team at the New Hope Fertility Center in New York City captured the world's attention when they announced the birth of a child to a mother carrying a fatal genetic defect.
Using a technique called mitochondrial replacement therapy, the researchers combined DNA from two women and one man to bypass the defect and produce a healthy baby boy — one with, quite literally, three genetic parents.
It was heralded as a stunning technological leap for in vitro fertilization, albeit one that the team was forced to perform in Mexico, because the technique has not been approved in the United States....
http://www.npr.org/sections/health-shots/2017/01/01/507244429/unexpected-risks-found-in-editing-genes-to-prevent-inherited-disorders
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