S cientists have edited human embryos for the first time in the UK to discover a “master gene” that underpins successful pregnancies. The “game-changing” research promises improved IVF outcomes and a breakthrough in understanding why so many pregnancies fail.

The Government-funded investigation, undertaken by the Francis Crick Institute, is the first to prove that gene editing can be used to study the genetic behaviour of human embryos in their first few days of life.