Evolution before the origin of life? (chemistry)

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C C Offline
https://www.templeton.org/news/evolution...in-of-life

INTRO: A story about the origins of life in the cosmos starts at Earth’s equator, where Dian Fiantis, a professor of soil science at Andalas University in Indonesia, investigated how seemingly dead environments come back to life. In 2018, she traveled to Mt. Anak Krakatoa (which emerged after the famous Krakatoa’s eruption) to collect the volcanic ash it ejected two months before.

In her lab, she found out that volcanic glass (SiO2), the dominant chemical found in the ash, has extremely tiny holes that could store water. “A good place for cyanobacteria to grow,” said Fiantis. The microbe, which scientists called “nature’s little alchemist,” engineered the surrounding environment so that complex living systems like lichens and vascular plants could grow.

Fiantis’ research shows us what happens “before life” in modern circumstances. It might not tell us how life began on the early Earth, but this is the closest contemporary example of the blurry line between life and non-life. Just like a meteor impact or active hydrothermal vents, a volcanic eruption could represent the hellish conditions where nature may “mix things up and select for chemical configurations and try new things [that lead to life],” said Robert Hazen, a mineralogist at the Carnegie Institute of Sciences.

Hazen is one of many scientists who are now proponents of “evolution before life,” an idea referring to a universal chemical evolution that spans billions of years and comprises all possible space in the universe. This hypothesis argues that life emerged gradually as molecules evolved from simplicity to complexity, undergoing selections until reaching biological functions.

Science can’t create life from scratch yet, and no one has convincingly explained how life emerged on Earth in the first place. But the theory of chemical evolution, which stands on hundreds of scientific papers since the 1990s, is hot on the trail of science’s greatest enigma. It is not an “Earth-bound” theory, and it is now testable with AI technology.

“I am very much a believer that [chemical evolution] is the future of origins of life research,” says Joshua Goldford, a computational biologist at California Institute of Technology... (MORE - details)
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#2
Yazata Offline
(Apr 19, 2026 08:49 PM)C C Wrote: Hazen is one of many scientists who are now proponents of “evolution before life,” an idea referring to a universal chemical evolution that spans billions of years and comprises all possible space in the universe. This hypothesis argues that life emerged gradually as molecules evolved from simplicity to complexity, undergoing selections until reaching biological functions.

I suppose that depends on whether/how natural selection could work on pre-biotic chemistry as well as on life. It's easy to imagine natural selection applying to simple chemical replicators. But natural selection might conceivably be applicable to the simplest chemical concentrations as well. If some chemical concentrations are the result of particular chemical reactions, then we would expect concentrations to be highest where precursors are abundant and where things like temperature and pressure are conducive to the reactions occurring. So products of chemical reactions could be said to be adapted to the conditions that produced them. Reactions producing the same products that are adapted to a wider range of conditions would become more common than their more limited rivals as time goes on. And that might produce increasingly complex chemistry in step-wise fashion by favoring processes involving catalysts or chains of intermediate steps. Exactly the kind of things that we observe with life.

Maybe what I'm struggling with in inchaoate fashion here is imagining some way that natural selection might be applicable to initial production as well as subsequent reproduction.

Quote:Science can’t create life from scratch yet, and no one has convincingly explained how life emerged on Earth in the first place. But the theory of chemical evolution, which stands on hundreds of scientific papers since the 1990s, is hot on the trail of science’s greatest enigma. It is not an “Earth-bound” theory

Yes. Amino acids, sugars and the nucleobases found in DNA and RNA are known to exist in space, and probably have existed all over the universe for billions of years. It's like a whole set of puzzle pieces that might only fit together one way to produce Earth life, but might conceivably fit together in an unknown number of different equally viable ways in an unknown number of places.

Sometimes I think that life is an exceedingly rare thing, given the incredible complexity of even the simplest Earth bacteria. (Which after all are absolute wonders of nanotechnology at the atomic scale.) But other times I think that the functional analogue of Earth life, dramatically different chemical replicators that perform the same set of basic functions like nutrition, respiration and reproduction, might be more common than we think and be spread all over the universe as alien life (if we adopt a more expansive functional definition of 'life').

Quote:“I am very much a believer that [chemical evolution] is the future of origins of life research,” says Joshua Goldford, a computational biologist at California Institute of Technology... (MORE - details)

I couldn't agree more. That's where the clues to the origin of Earth life will most likely be found, as well as the theoretical limits of alien life.
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