Births of eight healthy children show promise of mitochondrial replacement therapy

LONDON — Ten years ago, U.K. policymakers gave the green light to a pioneering reproductive technology meant to spare children from being born with types of rare but sometimes fatal diseases caused by genetic mutations in the powerplants of cells. The method involved combining not just the genes of a mother and father to produce an embryo, but a bit of DNA from a third person as well. 

On Wednesday, the team in England that has been performing the technique reported that eight healthy babies have been born so far, highlighting that the approach reduced the risk of children inheriting disease-causing mutations in the pieces of DNA contained in our mitochondria. The results, published in a pair of papers in the New England Journal of Medicine, have been long awaited as the first large test of the approach, which is known as mitochondrial replacement therapy or mitochondrial donation. 

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