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Fleshing out the genome

Genomics, the study of all the genetic sequences in living organisms, has leaned heavily on the blueprint metaphor. A large part of the blueprint, unfortunately, has been unintelligible, with no good way to distinguish a bathroom from a boardroom, to link genomic features to cell function.

A national consortium of scientists led by BIATECH, a Seattle based non-profit research center, and Pacific Northwest National Laboratory (PNNL), a Department of Energy research institution in Richland, Wash., now suggests a way to put this house in order. They offer a powerful new method that integrates experimental and computational analyses to ascribe function to genes that had been termed "hypothetical" -- sequences that appear in the genome but whose biological purposes were previously unknown.


The method not only portends a way to fill in the blanks in any organism's genome but also to compare the genomes of different organisms and their evolutionary relationship.

The new tools and approaches offer the most-comprehensive-to-date "functional annotation," a way of assigning the mystery sequences biological function and ranking them based on their similarity to genes known to encode proteins. Proteins are the workhorses of the cell, playing a role in everything from energy transport and metabolism to cellular communication.

This new ability to rank hypothetical sequences according to their likelihood to encode proteins "will be vital for any further experimentation and, eventually, for predicting biological function," said Eugene Kolker, president and director of BIATECH, an affiliate scientist at PNNL and lead author of a study in the Feb. 8 Proceedings of the National Academy of Sciences that applies the new annotation method to a strain of the metal-detoxifying bacterium Shewanella oneidensis.

"In a lot of cases," said James K. Fredrickson, a co-author and PNNL chief scientist, "it was not known from the gene sequence if a protei
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Source:DOE/Pacific Northwest National Laboratory


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