First U.S.-based group to edit human embryos brings practice closer to clinic

August 07, 2017

The ethical and practical debates over using the DNA-editing method CRISPR to alter human embryos just got less hypothetical. A week after the news leaked out, a U.S.-based team has published the first rigorous demonstration that CRISPR can efficiently repair a gene defect in human embryos--one that would cause a potentially deadly heart condition--without introducing new mutations elsewhere.