Pigs grown from fetuses into which human stem cells were injected have surprised scientists by having cells in which the DNA from the two species is mixed at the most intimate level.

It is the first time such fused cells have been seen in living creatures. The discovery could have serious implications for xenotransplantation — the use of animal tissue and organs in humans — and even the origin… read more

A virulent form of tuberculosis was created in a laboratory by experts trying to alter its genetic structure. They disabled the collection of genes thought to give TB some of its virulence and expected to find a weakened form of TB as a result. Instead, the organism grew in virulence.

Autistic savants are born with miswired neurons—and extraordinary gifts. Geneticists are starting to pinpoint the DNA anomalies found in savants. More than a dozen genes may contribute to autism. Several other forms of mental impairment also produce islands of startling ability—known as splinter skills—as if fragments of savant code are scattered throughout the genetic database.