NASA scientists discover all-new form of life

[DKT27]

This is a NASA image of the microbe GFAJ-1 grown on arsenic. The microbe is the first known life to have a DNA structure different than all other known life forms.

NASA scientists have discovered an entirely new form of life that shares no biological building blocks with anything currently known on Earth, the agency said today.

In a press conference held at NASA's Washington D.C. headquarters, scientists announced that they had discovered a new form of bacteria, known as GFAJ-1, in California's Mono Lake that has DNA completely foreign to anything ever before found on Earth. It substitutes arsenic at the DNA level for phosphorus.

That would distinguish it from every other form of life known to man, all of which, no matter how diverse, is comprised of the same six elements, phosphorus, sulfur, carbon, hydrogen, oxygen, and nitrogen. But the bacteria found in Mono Lake--which is known for its unusual chemistry, including very high levels of salinity, alkalinity, and arsenic--is made partly of arsenic, and has no phosphorus in its DNA.

"We've discovered an organism that can substitute one element for another," said Felisa Wolfe-Simon, a NASA astrobiology research fellow at the U.S. Geological Survey in Menlo Park, Calif. "We've cracked open the door to what's possible for life elsewhere in the universe.

Although there had been speculation that NASA's announcement would revolve around life--perhaps bacteria--found elsewhere, such as Mars, the news does keep us here on Earth.

But Wolfe-Simon said that by discovering a microbe that has a new form of DNA, it forces scientists to question what they've long held as true--that all life was based on the same six components.

"The newly discovered microbe, strain GFAJ-1, is a member of a common group of bacteria, the Gammaproteobacteria," NASA wrote in a release. "In the laboratory, the researchers successfully grew microbes from the lake on a diet that was very lean on phosphorus, but included generous helpings of arsenic. When researchers removed the phosphorus and replaced it with arsenic, the microbes continued to grow. Subsequent analyses indicated that the arsenic was being used to produce the building blocks of new GFAJ-1 cells."

NASA feels that this discovery is important because it will help scientists with many areas of future research, such as the "study of Earth's evolution, organic chemistry, biogeochemical cycles, disease mitigation, and Earth system research. These findings also will open up new frontiers in microbiology and other areas of research."

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[henz]

when i see "alien" word in media, i keep on track with nasa :lol:

and the truth was found a microbe ...

[tipo]

i don`t understand why scientists call Earth the perfect planet for having clean air, water etc. maybe somewhere in the universe there are other humanoids that breathe hellium and drink sulfuric acid. their scientists are saying about our world that it weird and toxic. they developed and adapted in some conditions and us in other ones.