The genetic material from the donor makes up less than 1% of the baby born by using the experimental IVF technique.

A pioneering IVF technique combining DNA from three people to protect a baby from a rare genetic disease has been used in Britain, leading to a healthy cohort of eight babies with no sign of serious disease,

A groundbreaking IVF trial has raised hope that women with genetic mutations in their own DNA could one day have children without passing on deadly diseases.