Study suggests life on Earth originated twice independently
A radical study suggests that life on Earth may have originated twice independently, with bacteria and archaea developing their own metabolic pathways separately. Researchers analyzed enzymes across these two lineages and found they evolved differently, initially relying on metals in the environment before organisms developed their own enzymes over time.
Interesting, but not entirely surprising. The fact that life existed on Earth before humans appeared is nothing new, but the idea that life originated multiple times is more noteworthy. Will it happen again? What about SpudCell or AI itself?
What is the difference between one origin of life and two origins?
The research distinguishes between a single origin of the genetic code (represented by LUCA) and two independent origins of free-living cells. Bacteria and archaea are considered two separate evolutionary pathways that each developed their own metabolic enzymes and achieved cellular autonomy independently of each other.
What role did metals play in early metabolism?
Metals naturally occurring in hydrothermal vents likely served as the first catalysts, converting compounds like hydrogen, ammonia, and carbon dioxide into useful molecules. Proto-cells gradually developed their own enzymes that eventually replaced these metal catalysts as they became more complex.
What is LUCA and why is it important to this theory?
LUCA (Last Universal Common Ancestor) represents the first organism in the evolutionary tree and possessed enzymes for only about half of known metabolic reactions, with the other half catalyzed by environmental metals. Bacteria and archaea diverged after this point and independently developed their own enzyme solutions.
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- William Martin
- Heinrich Heine University Düsseldorf
- Natalia Mrnjavac
- Manon Schlikker
- LUCA
- bacteria
- archaea