Templated replication (or lack thereof) under prebiotically pertinent conditions

Area of Science:

• Astrobiology
• Origin of Life Research
• Biochemistry

Background:

• Accurate replication is key for early life's functional ribozymes.
• Previous studies focused on activated nucleotides, whose prebiotic availability is uncertain.

Purpose of the Study:

• Investigate nonenzymatic copying using 5'-nucleoside monophosphates (5'-NMP), a more plausible prebiotic monomer.
• Explore reactions under volcanic geothermal conditions with amphiphiles.

Main Methods:

• Nonenzymatic copying reactions with a 20-mer primer and 5'-NMP.
• Experiments conducted under simulated volcanic geothermal conditions with amphiphiles.
• Varied temperatures and rehydration solutions to test reaction robustness.

Main Results:

• Extended primers did not reach the expected full length, indicating base loss from 5'-NMP.
• Base loss occurred during monomer addition to the primer.
• Use of 5'-ribose monophosphate resulted in multiple additions, forming hybrid polymers.

Conclusions:

• Nonenzymatic copying with 5'-NMP is challenging due to base loss, impacting early information transfer.
• Formation of hybrid polymers from 5'-ribose monophosphate suggests a pathway for exploring diverse chemical spaces for primitive informational polymers.
• Findings have implications for understanding the origin of primitive genetic material.