From: Ray Dickenson <r.dickenson.nul> Date: Fri, 26 Oct 2012 15:23:19 +0100 Archived: Fri, 26 Oct 2012 17:07:22 -0400 Subject: Life - "But Not As We Know It" Hello List Just seen a New Scientist article http://tinyurl.com/bo2e3pb "Move Over DNA: Six New Molecules Can Carry Genes"! which describes how the MRC Lab, Cambridge UK has worked on how "six XNAs (xeno-nucleic acids). DNA and RNA are made of a sugar, a phosphate and a base. The XNAs had different sugars, and in some of them the sugars are replaced with completely different molecules." They've succeeded in finding enzymes that will work so "they were able to store information in each of the XNAs, copy it to DNA, and copy it back into a new XNA. In effect, the first XNA passed its information on to the new one - albeit in a roundabout way." They now say "The cycle we have is a bit like a retrovirus, which cycles between RNA and DNA, ...The immediate question is whether these XNAs can be introduced into cells," says Farren Isaacs of Yale University in New Haven, Connecticut. Once the XNAs were installed, they could replicate and evolve on their own. "That would be remarkable." And further: "This suggests XNAs might form the basis of life on other planets, where different environments led to different chemistry. "I would be surprised if we find truly extraterrestrial life that was based on DNA and RNA," Holliger says. "There might have been an XNA-world on a different planet." --- Cheers Ray D Listen to 'Strange Days... Indeed' - The PodCast At: http://www.virtuallystrange.net/ufo/sdi/program/ These contents above are copyright of the author and UFO UpDates - Toronto. They may not be reproduced without the express permission of both parties and are intended for educational use only.
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