All six calves inherited the gene for preventing horn growth, but four also got a piece of the plasmid used to introduce the sequence to their dad—complicating regulatory approval.

Emails reveal that a facility in Dubai and others have asked geneticist He Jiankui for help in gene-editing embryos.

He Jiankui could face charges after an investigation finds he used techniques prohibited in China to edit the genes of twin girls.

From disastrous scientific setbacks to the upending of scientific dogma and the end of a 40-year search for a protein

Since He Jiankui presented his results at last week’s gene editing summit, researchers have raised concerns about his protocol, calling the procedure “amateurish” and “unconscionable.”

Despite a premature and ethically sketchy claim of genome editing in twin girls, an outright prohibition could blunt promising, responsible progress.

He Jiankui, who reportedly edited the genomes of two babies already, broke the news at a conference in Hong Kong.

He Jiankui says he has successfully used CRISPR-Cas9 to tweak the genes of twins born earlier this month. Some independent experts are dubious.

A mouse study details a method called VIVO that predicts the accuracy of any guide RNA.