Scientists say the world's first baby has been born using DNA from three parents in a technique hailed as "revolutionary".
The controversial "three-parent" technique allows parents with rare genetic mutations to have healthy babies.
The baby, whose mother and father are Jordanian, was born in Mexico with the help of a New-York based team led by Dr John Zhang.
He was conceived from an egg containing nuclear DNA from his parents, and mitochondrial DNA from a "second" mother - an unknown female donor.
The technique has been approved in the UK - but this time it was altered slightly because as Muslims they were against the destruction of embryos.
The UK-backed method is called pronuclear transfer where the mother's egg and a donor egg are fertilised with the father's sperm.
Each nucleus of the fertilised eggs is then removed before they divide into early-stage embryos.
The nucleus from the donor's fertilised egg is discarded and replaced by that from the mother's fertilised egg.
But Dr Zhang did something different called spindle nuclear transfer - where he removed the nucleus from one of the mother's eggs and inserted it into a donor egg that had had its own nucleus removed.
The resulting egg - with nuclear DNA from the mother and mitochondrial DNA from a donor - was then fertilised with the father's sperm.
Five embryos were created, only one of which developed normally. This embryo was implanted in the mother and the child was born nine months later.
The mother has genes for Leigh syndrome, a fatal disorder that affects the developing nervous system.
Genes for the disease reside in DNA in the mitochondria, which provide energy for our cells and carry just 37 genes that are passed down to us from our mothers.
This is separate from the majority of our DNA, which is housed in each cell's nucleus.
About a quarter of her mitochondria have the disease-causing mutation. While she is healthy, Leigh syndrome was responsible for the deaths of her first two children, so she sought out Mr Zhang's help.
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