John Gurdon

Sir John Gurdon was a British developmental biologist whose 1958 experiment showed that the nucleus taken from a fully specialized adult frog cell could, when transplanted into an egg whose own nucleus had been removed, direct the development of a complete, cloned frog. This result demonstrated that a mature cell nucleus retains the full genetic instructions needed to build an entire organism, overturning the prevailing view that cellular specialization was irreversible, and it later underpinned the science of cloning and stem cell reprogramming. He also pioneered the use of frog eggs and oocytes as a system for studying how injected messenger RNA is translated into protein, a technique that became a standard laboratory tool across molecular biology. Gurdon shared the 2012 Nobel Prize in Physiology or Medicine with Shinya Yamanaka for the discovery that mature cells can be reprogrammed to become pluripotent, connecting his decades-earlier nuclear transfer work directly to Yamanaka later discovery of induced pluripotent stem cells. He earned his doctorate at Oxford under Michail Fischberg, held positions at Oxford, Cambridge and the Medical Research Council Laboratory of Molecular Biology, served as Master of Magdalene College, Cambridge from 1995 to 2002, and was knighted in 1995.