description John Gurdon Overview
John Gurdon (born 1933) is a British developmental biologist whose 1962 experiments at Oxford demonstrated that the nucleus of a differentiated intestinal cell from a tadpole could direct development of a complete cloned frog when transplanted into an enucleated egg. This showed that specialized cells retain a complete set of genetic instructions rather than losing unused genes. He shared the 2012 Nobel Prize in Physiology or Medicine with Shinya Yamanaka, who later induced pluripotency in mammalian cells.
insights Ranking position
John Gurdon ranks #14 of 150 in the Physician ranking, behind Ernst Chain, ahead of Emil von Behring.
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What did John Gurdon's frog cloning experiment prove?
Gurdon showed that a nucleus taken from a differentiated tadpole cell could still contain the genetic information needed to direct development. This contradicted the idea that specialization permanently destroyed or removed genes from mature cells.
How did Gurdon's 1962 nuclear-transfer experiment work?
He removed or inactivated the nucleus of a frog egg and replaced it with a nucleus from a mature tadpole intestinal cell. Some reconstructed eggs developed into tadpoles, demonstrating that the mature nucleus could be reprogrammed by the egg.
How is John Gurdon's work connected to Dolly the sheep?
Both used somatic cell nuclear transfer, although Gurdon worked with frogs and Dolly was cloned from an adult sheep cell. The 1997 announcement of Dolly showed that nuclear reprogramming could also produce a mammal from an adult-cell nucleus.
Why did Gurdon share the 2012 Nobel Prize with Shinya Yamanaka?
Both discoveries showed that mature cells are not irreversibly locked into their specialized state. Gurdon demonstrated reprogramming by nuclear transfer, while Yamanaka later produced induced pluripotent stem cells by introducing a small set of genes.
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