Kiran Musunuru was shocked. In a few days, on Nov. 27, 2018, scientists from all over the world would meet in Hong Kong to set standards for the use of the CRISPR gene-editing tool on human embryos. Yet the paper in front of him suggested that in China, gene-edited twins were already growing in their mother’s uterus, with the help of scientist He Jiankui.
“I was horrified,” Musunuru recalled as he spoke to science writers gathered in State College, Pa. 11 months later, for the ScienceWriters2019 conference. “This is an historic event, the first gene-edited babies. And this is a horror show.”
That day, Associated Press reporter Marilynn Marchione had requested the opinion of three experts in genetics on an unpublished paper. Musunuru, an associate professor at the University of Pennsylvania School of Medicine, was one of them. The claims made by He, the paper’s lead author, were grandiose and terrifying: he had implanted gene-edited embryos.