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Strange cousins: Molecular alternatives to DNA, RNA offer new insight into life's origins
Date:4/20/2012

tments of water/oil emulsion to conduct directed evolution of enzymes, particularly polymerases. By isolating self-replication reactions from each other, the process greatly improves the accuracy and efficiency of polymerase evolution and replication. "What nobody had really done before," Chaput says, "is to take those technologies and apply them to unnatural nucleic acids. "

Chaput also underlines the importance of an international collaboration for carrying out this type of research, particularly for the laborious effort of assembling the triphosphate substrates needed for each of the 6 XNA systems used in the study:

"What happened here is that a community of scientists came together and organized around this idea that we could find polymerases that could be used to open up biology to unnatural polymers. It would have been a tour de force for any lab to try to synthesize all the triphosphates, as none of these reagents are commercially available."

The study advances the case for a pre-RNA world, while revealing a new class of XNA aptamers capable of fulfilling myriad useful roles. Although many questions surrounding the origins of life persist, Chaput is optimistic that solutions are coming into view: "Further down the road, through research like this, I think we'll have enough information to begin to put the pieces of the puzzle together."


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Contact: Richard Harth
richard.harth@asu.edu
Arizona State University
Source:Eurekalert  

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