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Earth’s Original Ancestor Was ‘LUCA’

December 20, 2008

 An evolutionary geneticist from the Université de Montréal, together with researchers from the French cities of Lyon and Montpellier, have published a ground-breaking study that characterizes the common ancestor of all life on earth, LUCA (Last Universal Common Ancestor).
Their findings, presented in a recent issue of Nature, show that the 3.8-billion-year-old organism was not the creature usually imagined.

The study changes ideas of early life on Earth. “It is generally believed that LUCA was a heat-loving or hyperthermophilic organism. A bit like one of those weird organisms living in the hot vents along the continental ridges deep in the oceans today (above 90 degrees Celsius),” says Nicolas Lartillot, the study’s co-author and a bio-informatics professor at the Université de Montréal. “However, our data suggests that LUCA was actually sensitive to warmer temperatures and lived in a climate below 50 degrees.”

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