Prebiotic gas flow environment enables isothermal nucleic acid replication.

Area of Science:

• Origin of life studies
• Prebiotic chemistry
• Molecular evolution

Background:

• Nucleic acid replication is vital for life's origin but challenged by dilution and strand separation on early Earth.
• Thermal gradient systems aid replication but high temperatures cause degradation and are geologically rare.
• Isothermal, non-equilibrium environments offer a promising alternative for prebiotic processes.

Purpose of the Study:

• To model and experimentally validate an abundant, isothermal geological environment for early Earth.
• To investigate a system that overcomes dilution and facilitates nucleic acid separation for exponential replication.
• To demonstrate sustained DNA replication in a constant temperature, non-equilibrium setting.

Main Methods:

• Experimental setup simulating gas-water interface evaporation and momentum transfer.
• Tracking fluorescent beads and fluid dynamic simulations to analyze flow patterns.
• Utilizing Taq polymerase for exponential DNA replication in the developed isothermal system.

Main Results:

• Achieved a 30-fold accumulation of nucleic acids.
• Demonstrated periodic separation of nucleic acids with a threefold reduction in salt and product concentration.
• Successfully drove exponential DNA replication in the isothermal, non-equilibrium system.

Conclusions:

• The studied isothermal system effectively models a ubiquitous non-equilibrium environment for prebiotic chemistry.
• This system addresses key challenges of early replication, including concentration and separation, at constant temperatures.
• Provides a viable model for early Darwinian molecular evolution in geologically relevant conditions.