Insuperable problems of the genetic code initially emerging in an RNA world

Area of Science:

• Biochemistry
• Origin of Life Studies
• Theoretical Biology

Background:

• The origin of coded protein synthesis and the Central Dogma remains a significant challenge in understanding life's beginnings.
• Existing hypotheses, such as the RNA World, face difficulties in explaining the concerted emergence of genetic coding and translation.
• Autocatalysis and error-prone information transfer are key processes in early molecular evolution.

Purpose of the Study:

• To develop differential equations modeling error-prone information transfer in biological systems.
• To evaluate contrasting scenarios for the origin of specific tRNA aminoacylation and its link to the Central Dogma.
• To assess the plausibility of self-organization principles versus the RNA World for the emergence of genetic coding.

Main Methods:

• Formulation of differential equations to describe template replication, transcription, and translation with inherent errors.
• Mathematical analysis of these equations to explore the dynamics of autocatalysis and information transfer.
• Comparative assessment of different evolutionary scenarios for the origin of molecular information processing.

Main Results:

• The developed models provide a framework for analyzing the advent of coded protein synthesis.
• Variations of the equations allow for comparison of scenarios regarding tRNA aminoacylation and enzyme involvement.
• The study highlights limitations of the RNA World hypothesis in explaining the origin of the genetic code.

Conclusions:

• Principles of self-organization, transcending Darwinian selection, offer a robust explanation for the rapid emergence of genetic coding.
• A peptide·RNA world, driven by self-organization, provides a more plausible pathway to the Central Dogma than the RNA World alone.
• The study suggests a concerted transition to genetic coding facilitated by non-Darwinian principles.