Scientists have successfully edited the DNA of human embryos to erase a heritable heart condition, cracking open the doors to a controversial new era in medicine. This is the first time gene editing on human embryos has been conducted in the United States. Researchers said in interviews this week that they consider their work very basic. The embryos were allowed to grow for only a few days, and there was never any intention to implant them to create a pregnancy. But they

also acknowledged that they will continue to move forward with the science, with the ultimate goal of being able to “correct” disease-causing genes in embryos that will develop into babies. News of the remarkable experiment began to circulate last week, but details became public Wednesday with a paper in the journal Nature.The experiment is the latest example of how the laboratory tool known as CRISPR (or Clustered Regularly Interspaced Short Palindromic Repeats), a type of “molecular scissors,” is pushing the boundaries of our ability to manipulate life . READ MORE