Hydrogen peroxide thermochemical oscillator as driver for primordial RNA replication

Area of Science:

• Astrobiology
• Origin of Life Studies
• Biochemistry

Background:

• The origin of life requires a mechanism for molecular replication.
• Prebiotic Earth conditions likely involved complex chemical reactions and environmental fluctuations.
• Existing models for early replication often lack robust driving forces.

Purpose of the Study:

• To investigate a novel mechanism for driving self-replicating molecular systems on the prebiotic Earth.
• To test the hypothesis that thermochemical oscillations could power cell-free RNA replication.
• To explore the potential role of oscillatory reactions in the emergence of life.

Main Methods:

• Utilized a well-characterized hydrogen peroxide oscillator as a chemical driver.
• Employed complementary RNA strands with known kinetic properties as the substrate.
• Developed and numerically solved an open flow system model for coupled temperature and concentration dynamics in an autocatalytic scheme.

Main Results:

• Demonstrated that thermochemical cycling effectively drives the replication of RNA strands.
• Simulated results showed a mean replicant production 6.56 times the input amount at steady state.
• Confirmed the spontaneous onset of sustained thermochemical oscillations through parameter drift.
• Proposed a scheme for prebiotic RNA strand production on rock surfaces.

Conclusions:

• Thermochemical oscillations represent a viable, previously unrecognized mechanism for driving prebiotic RNA replication.
• This oscillatory system offers a robust pathway for generating molecular complexity in early Earth environments.
• The findings provide new insights into the chemical and physical conditions conducive to the origin of life.