Ch 16, A mad world (A mad world)

by David Turell , Tuesday, December 11, 2012, 17:47 (4154 days ago) @ David Turell


> Again ask yourself, where did this pre-plannng information come from?-More evidence of pre-planning; archaea set up DNA just like we do but they don't have a nucleus:-"Our genetic material is packaged into chromatin—DNA wrapped around proteins called histones, then bound up in bundles called nucleosomes. This style of packaging has long been considered a hallmark of eukaryotes, a way of compressing our large genomes into manageable sizes and controlling the expression of our genes. But scientists from the University of Toronto have shown that archaea—a separate domain of life—also wrap their genomes around histones in a way that resembles eukaryotic chromatin.
 
"The conventional wisdom was that the purpose of chromatin was genome-packaging—fitting a 4-meter stretch of DNA into a 5-micrometer nucleus," said the University of Toronto's Corey Nislow, who led the new study. But archaea do not have a nucleus, and their small circular genomes are easier to package inside their cells. "If the primary role for chromatin is not packaging, it might instead be to regulate gene expression," Nislow said."-http://www.the-scientist.com/?articles.view/articleNo/33620/title/Conserved-Chromatin-/