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- Brett Israel
Rx for the Brain-Injured Patient: A Shot of Tequila?
Built on Facts
- Matt Springer
Easy + Easy + Easy = Impossible
Discoblog
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Do Men Get Struck By Lightning More Than Women?
Not Exactly Rocket Science
- Ed Yong
Genes Affect Our Likelihood to Punish Unfair Play
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Reader Photo Gallery: Crazy Dust Storm Turns Sydney Red


NEWS SERVICE HOME
Researchers find that evolution can never go backwards, because the paths to the genes once present in our ancestors are forever blocked. The team used computational reconstruction of ancestral gene sequences, DNA synthesis, protein engineering and X-ray crystallography to resurrect and manipulate the gene for a key hormone receptor as it existed in our earliest vertebrate ancestors more than 400 million years ago. They found that over a rapid period of time, five random mutations made subtle modifications in the protein's structure that were utterly incompatible with the receptor's primordial form.


