The United Kingdom on Tuesday became the first country in the world to legalise the creation of babies with DNA from two women and one man.
According to a BBC report, in a free vote in the Commons, 382 MPs were in favour and 128 against the technique that stops genetic diseases being passed from mother to child.
During the debate, ministers said the technique was “light at the end of a dark tunnel” for families.
Proponents said the backing was “good news for progressive medicine”.
The Chief Medical Officer Prof Dame Sally Davies said a yes vote would put the UK at the forefront of scientific development.
A further vote is required in the House of Lords. It everything goes ahead then the first such baby could be born next year.
Critics say they will continue to fight against the technique that they say raises too many ethical and safety concerns.
The technique, which was developed in Newcastle, should help women like Sharon Bernardi, from Sunderland, who lost all seven of her children to mitochondrial disease.
Mitochondria are the tiny compartments inside nearly every cell of the body that convert food into useable energy. They have their own DNA which does not affect characteristics such as appearance.
Defective mitochondria, which are passed down only from the mother, lead to brain damage, muscle wasting, heart failure and blindness.
The technique uses a modified version of IVF to combine the DNA of the two parents with the healthy mitochondria of a donor woman.
It results in babies with 0.1% of their DNA from the second woman and is a permanent change that would be passed down through the generations.