Minimal requirements for molecular information transfer

Area of Science:

• Biochemistry and Astrobiology

Background:

• Nucleic acid bases are crucial for information transfer.
• Evolution selected specific heterocyclic, condensed-ring structures for this role.

Purpose of the Study:

• To explore the critical role of base structure in nucleic acid information transfer.
• To consider alternative molecular structures for information transfer in extraterrestrial environments.

Main Methods:

• Theoretical analysis of molecular structures and their information transfer capabilities.
• Comparative assessment of purine and pyrimidine analogs.

Main Results:

• Nucleic acid base structure is paramount for efficient information transfer in aqueous solutions.
• Backbone alterations (linkage, sugar) are less critical than base structure.
• Alternative information transfer systems (proteins, clay minerals) lack current evidence.

Conclusions:

• The specific properties of purine and pyrimidine bases are key to life's information storage.
• Alternative backbone structures could have facilitated early life or extraterrestrial life.
• Non-nucleic acid information transfer systems remain speculative.