Three-person IVF 'crosses crucial ethical line'
28 June 2013 Last updated at 12:34 BST
The UK looks set to become the first country to allow the creation of babies using DNA from three people, after the government backed the IVF technique.
It will produce draft regulations later this year and the procedure could be offered within two years.
Experts say three-person IVF could eliminate debilitating and potentially fatal mitochondrial diseases that are passed on from mother to child.
But Dr David King from Human Genetics Alert, says that the process would be the start of a slippery slope.