On the origin of life

Area of Science:

• Astrobiology
• Origin of Life Research
• Geochemistry

Background:

• The origin of life requires specific chemical and physical conditions, including energy sources and mechanisms for molecular replication and compartmentalization.
• Previous hypotheses have explored various environments, but a comprehensive model integrating all necessary factors remains elusive.

Purpose of the Study:

• To propose a plausible environmental scenario for the origin of life on early Earth.
• To identify an environment that satisfies the distinct requirements for RNA replication and protocell formation.

Main Methods:

• The study integrates known chemical requirements for early life (e.g., nucleotide synthesis) with physical environmental conditions.
• It analyzes the properties of geothermal lakes, particularly their temperature fluctuations and energy availability.

Main Results:

• Geothermal lakes offer a dual energy source: chemical energy for RNA replication and mechanical energy for vesicle division.
• These lakes provide a unique thermal cycling environment: cool temperatures for RNA copying, with brief high-temperature pulses from hydrothermal vents for strand separation, followed by rapid cooling.

Conclusions:

• Geothermal lakes represent a highly probable environment for the origin of life, fulfilling the complex chemical and physical demands of early biological systems.
• This model integrates RNA replication, vesicle formation, and thermal cycling within a single, accessible early Earth setting.