The aim of this form of IVF is to stamp out serious diseases which can be passed from a mother to her children. Around one in 200 babies are born each year in the UK with a defect in the way cells are supplied with energy.
One in 6,500 babies can suffer potentially life-threatening diseases including a form of muscular dystrophy and conditions leading to hearing and vision loss, heart, lung and liver problems, and bowel disorders. An estimated 12,000 people in the UK live with the diseases.
More top news
A look ahead to the forecast for today across the UK.
Tackling and scrums should be banned in school rugby games due to the risk of serious injury, according to health experts.
Luke Sinnott has won a gold medal in the 200 metre sprint for amputee competitors, now he is giving it to the family of a fallen soldier.