'Fettuccine' May Be Most Obvious Sign Of Life On Mars, Researchers Report

Photo by Tom Murphy

A rover scanning the surface of Mars for evidence of life might want to check for rocks that look like pasta, researchers report in the journal Astrobiology.

The bacterium that controls the formation of such rocks on Earth is ancient and thrives in harsh environments that are similar to conditions on Mars, said University of Illinois geology professor Bruce Fouke, who led the new, NASA-funded study.

New research focuses on filamentous microbes that make their living in hot springs and catalyze the formation of travertine rock.
Photo by Bruce W. Fouke

“It has an unusual name, Sulfurihydrogenibium yellowstonense,” he said. “We just call it ‘Sulfuri.’”

In fast-flowing hot springs, the microbe scientists call “Sulfuri” assembles itself into pastalike strands and promotes the crystallization of calcium carbonate rock – also known as travertine – along its surfaces.

Photo by Tom Murphy

The bacterium belongs to a lineage that evolved prior to the oxygenation of Earth roughly 2.35 billion years ago, Fouke said. It can survive in extremely hot, fast-flowing water bubbling up from underground hot springs. It can withstand exposure to ultraviolet light and survives only in environments with extremely low oxygen levels, using sulfur and carbon dioxide as energy sources.

“Taken together, these traits make it a prime candidate for colonizing Mars and other planets,” Fouke said.

And because it catalyzes the formation of crystalline rock formations that look like layers of pasta, it would be a relatively easy life form to detect on other planets, he said.

Credit: IGBIllinois

The unique shape and structure of rocks associated with Sulfuri result from its unusual lifestyle, Fouke said. In fast-flowing water, Sulfuri bacteria latch on to one another “and hang on for dear life,” he said.

If a rover on Mars or other planets finds rock formations that look like pasta, it could be a signature of alien microbes, researchers report. This formation is the result of microbes that colonize hot springs on Earth.

Photo by Bruce W. Fouke

“They form tightly wound cables that wave like a flag that is fixed on one end,” he said. The waving cables keep other microbes from attaching. Sulfuri also defends itself by oozing a slippery mucus.

“These Sulfuri cables look amazingly like fettuccine pasta, while further downstream they look more like capellini pasta,” Fouke said. The researchers used sterilized pasta forks to collect their samples from Mammoth Hot Springs in Yellowstone National Park.

The team analyzed the microbial genomes, evaluated which genes were being actively translated into proteins and deciphered the organism’s metabolic needs, Fouke said.

Researchers – including, from left, Illinois geology professors Robert Sanford and Bruce Fouke; Bucknell University undergraduate student Kyle Fouke; Glenn Fried, the director of the Carl R. Woese Institute for Genomic Biology core facilities; and Mayandi Sivaguru, the associate director of IGB core facilities – analyzed a bacterium with characteristics that make it a good candidate for life on other planets.

Photo by L. Brian Stauffer

The team also looked at Sulfuri’s rock-building capabilities, finding that proteins on the bacterial surface speed up the rate at which calcium carbonate – also called travertine – crystallizes in and around the cables “1 billion times faster than in any other natural environment on Earth,” Fouke said. The result is the deposition of broad swaths of hardened rock with an undulating, filamentous texture.

“This should be an easy form of fossilized life for a rover to detect on other planets,” Fouke said.

Credit: IGBIllinois

“If we see the deposition of this kind of extensive filamentous rock on other planets, we would know it’s a fingerprint of life,” Fouke said. “It’s big and it’s unique. No other rocks look like this. It would be definitive evidence of the presences of alien microbes.”

Fouke also is an affiliate professor of microbiology and of the Carl R. Woese Institute for Genomic Biology at the U. of I.

Contacts and sources:
Diana Yates
University of Illinois at Urbana-Champaign, News Bureau
Citation: “Physiology, metabolism, and fossilization of hot-spring filamentous microbial mats” is available online