Reconstituting alternative life using the test-bed of cell-free systems

Area of Science:

• Astrobiology and Origins of Life Research
• Synthetic Biology and Biotechnology

Background:

• Earth's current life evolved through specific biochemical pathways.
• Alternative biochemical trajectories could yield different life forms.
• Experimental exploration of these 'roads not taken' is now feasible.

Purpose of the Study:

• To discuss how cell-free systems (CFS) enable experimental investigation of alternative life.
• To highlight CFS's role in reconstituting biological functions with novel components.
• To explore the potential reintegration of these functions into future alternative life forms.

Main Methods:

• Utilizing cell-free systems (CFS) for controlled in vitro reconstitution of biological functions.
• Employing natural and synthetic orthogonal components to test engineered alternatives.
• Characterizing information transfer steps with alternative machinery (e.g., xeno nucleic acids, non-canonical amino acids).

Main Results:

• CFS facilitate the study of biological information transfer using alternative components.
• Alternative machineries, including xeno nucleic acids and non-canonical amino acids, have been characterized.
• Constraints for alternative biochemistries and compartments have been identified.

Conclusions:

• Cell-free systems are a powerful tool for exploring the possibilities of alternative life.
• Experimental reconstitution of alternative biological functions is advancing Origins of Life research.
• Future research may focus on integrating these functions into novel life forms.