July 22, 2009

WE ARE ALL DESIGNISTS NOW:

How Evolution Can Allow For Large Developmental Leaps (ScienceDaily, July 21, 2009)

According to a team led by scientists at the California Institute of Technology (Caltech), in close collaboration with Patrick Piggot and colleagues from the Temple University School of Medicine, such changes may at least sometimes be the result of random fluctuations, or noise (nongenetic variations), working alongside a phenomenon known as partial penetrance. Their findings were recently published online in the journal Nature. [...]

In their Nature paper, Elowitz and Eldar, along with their colleagues, studied partial penetrance in a species of bacterium known as Bacillus subtilis. Specifically, they looked at the spores B. subtilis produces as a survival mechanism when times get tough. These spores are smaller, dormant clones of their so-called "mother cell." They're attached to the mother, but are separate entities with their own DNA.

A bacterial spore is designed specifically to do nothing but survive. "It doesn't grow, it doesn't do anything," says Eldar. "It just waits for the good times to return."

The wild-type B. subtilis bacterium always sporulates the same way: it creates a single spore, smaller than the mother cell, but with an exact single copy of the mother's chromosome.

What the scientists looked at was a "mutant in which the sporulation process was altered," Eldar explains. "Usually, these cells talk with each other, with the small spore telling the large mother cell, 'I'm here, and I'm doing OK.' In the wild-type cell, this chatter is loud; in the mutant, it's just a whisper, and the mother can't always hear."


It's the talking cure for Darwinism.

Posted by Orrin Judd at July 22, 2009 6:41 AM
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