Abstract

The surprise announcement in November 2018 that a Chinese researcher had implanted and brought to term two gene-edited embryos, resulting in the birth of twin girls, had the effect of galvanizing a debate that goes back decades. Should we make heritable changes in our children's DNA? Until recently, this was hypothetical only, and the easy response was to say it is too uncertain and too unnecessary to be tolerated. Suddenly, however, the possibility that there might be real uses for mitochondrial DNA replacement or for germline editing has led to a more nuanced debate, ranging from calls to double-down on prohibiting this technology to discussions of how to permit it for a...