The origin of life on Earth required the supply of phosphorus for the synthesis of universal biomolecules. The closed lake may have accumulated high concentrations of this element on the early Earth. However, it is not clear whether prebiotic sink in such settings was sustainable. New research by scientists from Eth Zurich, Cambridge University and the University of Science and Technology in China shows that high concentrations of phosphorus can be combined in steady states in large closed basin lakes.
Phosphorus is an important component of all known forms of biochemistry and plays an important role in such polymers that encode metabolism, cell structure, and information.
However, the environmental conditions that provided sufficient phosphorus available in aqueous solutions to promote the chemical origin of life are uncertain.
“Large soda lakes with no natural runoff can maintain phosphorus concentrations for a long enough long, even if life begins to exist at some point, and could continually consume phosphorus.”
“Such lakes lose water only by evaporation. This means that phosphorus is left in the water, not washed away through rivers or streams.”
“As a result, very high concentrations of phosphorus can accumulate in these soda lakes.”
Not all soda lakes are suitable. Researchers rule out small ones.
“As soon as life develops within them, the supply of phosphorus will deplete faster than it is replenished. This will snag both chemical reactions and developing life,” Dr. Walton said.
“On the other hand, in large soda lakes, phosphorus concentrations are high enough to maintain both basic chemical reactions and life over the long term.”
“These high concentrations are achieved by the large amounts of influential river water, including phosphorus, but the water only leaves the lake by evaporation.”
“Phosphorus doesn’t evaporate easily, so it accumulates in the lake and accumulates.”
In their study, Dr. Walton and colleagues focus on Lake Mono in California, with high phosphorus concentrations at steady state despite extremely high biological productivity.
“This is important because in small lakes, phosphorus is exhausted before new quantities form,” they said.
They consider the large soda lake, which had a constant high phosphorus supply in the early history of the Earth, to be an ideal environment for the origin of life.
They assume that life is more likely to have been born in such a larger body of water than in a small pool, as Charles Darwin suspected.
Therefore, the origin of life may be closely related to the special environment of large soda lakes, which provide ideal conditions for prebiotic chemistry due to the balance of geological environment and phosphorus.
“This new theory will help us solve another part of the puzzle of the origins of life on Earth,” Dr. Walton said.
a paper A description of the findings was published in the journal Advances in science.
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Craig R. Walton et al. 2025. Large, closed basin lakes provided sustained phosphates during the origin of life. Advances in science 11(8); doi:10.1126/sciadv.adq0027
Source: www.sci.news
