Planet Earth

Bacteria Beef Up New Tree of Life

The new tree of life includes previously unknown species throughout the bacterial branches.

By Jonathon KeatsDec 12, 2016 6:00 AM
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This new tree includes previously unknown species throughout the bacterial branches. It also features a new bacterial branch, Candidate Phyla Radiation, detailed above. | Reprinted by permission from Macmillan Publishers Ltd: Hug Et al. Nature microbiology/10.1038/NMICROBIOL.2016.48/11 April 2016

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A shallow aquifer beneath the Colorado River floodplain doesn’t spring to mind as a hotspot for new forms of life. But it turns out that the area, near the town of Rifle, Colorado, is prime real estate for bacteria.

Nobody expected to see such a lively community until University of California, Berkeley, geomicrobiologist Jillian Banfield visited the site to sample the water for genetic material. Given the unexpected biodiversity she and her colleagues uncovered there — and at other inhospitable sites, from Yellowstone hot springs to Chile’s Atacama Desert — Banfield created a new Tree of Life.

Mapping the genetic relationship between species, the tree shows that scientists have been oblivious to nearly a third of life — mostly bacterial — on Earth. That’s because approximately half the world’s bacteria cannot be cultivated in a lab. Banfield and her colleagues overcame the problem by analyzing environments metagenomically: sequencing each community’s DNA and then puzzling together individual genomes.

A Tree of Life shows “how organisms are related to each other,” Banfield says, and the goal of this version, published in April in Nature Microbiology, was “to provide a balanced sampling.” It’s a new view of life that accounts for diverse possibilities beyond what can grow in a petri dish.

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