Britain took another step towards legalizing three-person IVF.

When doctors find that the fertilized egg suffers from such disorders, then they remove the affected mitochondria and replace it with mitochondria from a donor egg.
While there are ethical concerns, the panel said that there was a ‘general support’ for legalizing such a procedure. “Broadly speaking the public was in favor of these novel techniques being translated into treatments. They felt that any ethical concerns were outweighed by potential benefits”, Prof Neva Haites, who was with the panel, said.
Source-Medindia