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Boldly illuminating biology's 'dark matter'
Date:7/14/2013

Is space really the final frontier, or are the greatest mysteries closer to home? In cosmology, dark matter is said to account for the majority of mass in the universe, however its presence is inferred by indirect effects rather than detected through telescopes. The biological equivalent is "microbial dark matter," that pervasive yet practically invisible infrastructure of life on the planet, which can have profound influences on the most significant environmental processes from plant growth and health, to nutrient cycles in terrestrial and marine environments, the global carbon cycle, and possibly even climate processes. By employing next generation DNA sequencing of genomes isolated from single cells, great strides are being made in the monumental task of systematically bringing to light and filling in uncharted branches in the bacterial and archaeal tree of life. In an international collaboration led by the U.S. Department of Energy Joint Genome Institute (DOE JGI), the most recent findings from exploring microbial dark matter were published online July 14, 2013 in the journal Nature.

"Instead of wondering through the starkness of space, this achievement is more like the 21st Century equivalent of Lewis and Clark's expedition to open the American West," said Eddy Rubin, DOE JGI Director. "This is a powerful example of how the DOE JGI pioneers discovery, in that we can take a high throughput approach to isolating and characterizing single genomes from complex environmental samples of millions of cells, to provide a profound leap of understanding the microbial evolution on our planet. This is really the next great frontier."

This microbial dark matter campaign targeted uncultivated microbial cells from nine diverse habitats: Sakinaw Lake in British Columbia; the Etoliko Lagoon of western Greece; a sludge reactor in Mexico; the Gulf of Maine; off the north coast of Oahu, Hawaii, the Tropical Gyre in the south Atlantic; the East Pac
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Contact: David Gilbert
degilbert@lbl.gov
DOE/Joint Genome Institute
Source:Eurekalert

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