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The operation is a daring one: To replace a failing heart valve, cardiologists insert a replacement through a patient’s groin and thread it all the way to the heart, maneuvering it into the site of the old valve

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Two women with gene mutation that causes degenerative disorder will undergo mitochondrial replacement therapy (MRT)

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But the child’s parents have decided to forego long-term monitoring by researchers

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The idea is that the technique, called mitochondrial replacement, avoids harmful mitochondrial mutations passing from the mother to her children. It works by removing the nucleus from a mother’s egg and inserting it into a donor egg, which has its own nucleus removed. The egg is then fertilised with the father’s sperm

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It’s a boy! A five-month-old boy is the first baby to be born using a new technique that incorporates DNA from three people, New Scientist can reveal. “This is great news and a huge deal,” says Dusko Ilic at King’s College London, who wasn’t involved in the work. “It’s revolutionary.”

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You want to be a cyborg, but medical ethicists aren’t sure it should be your call. Our Margaret Moon speaks with Inverse about requests for enhancements

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Scientists have developed an innovative 3D bioprinter capable of generating replacement tissue that’s strong enough to withstand transplantation. To show its power, the scientists printed a jaw bone, muscle, and cartilage structures, as well as a stunningly accurate human ear.

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The U.K. might become the first nation to allow in-vitro fertilization using DNA from three people. Our Dr. Margaret Moon speaks with WSJ’s Tanya Rivero about the ethical implications

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