Codon optimality, bias and usage in translation and mRNA decay.

Area of Science:

• Molecular Biology
• Genetics
• Biochemistry

Background:

• Codon bias, the non-uniform usage of synonymous codons, functions as a secondary genetic code.
• This bias influences protein production efficiency, translation fidelity, and messenger RNA (mRNA) metabolism.
• Recent findings link ribosome dynamics and mRNA decay, introducing the concept of codon optimality.

Purpose of the Study:

• To review the evidence for codon-dependent effects on translation.
• To explore the mechanisms by which translation perturbation impacts protein folding and mRNA stability.
• To discuss how cells utilize codon effects for proteome regulation, homeostasis, and differentiation.

Main Methods:

• Ribosome profiling to analyze mRNA translation.
• Analysis of mRNA decay pathways.
• Review of existing literature on codon bias and translation dynamics.

Main Results:

• Codon bias significantly affects translation efficiency, protein folding, and mRNA transcript stability.
• A tight coupling exists between ribosome dynamics and mRNA decay.
• Cells leverage codon optimality to regulate gene expression and protein production.

Conclusions:

• Codon bias is a critical regulatory layer in gene expression.
• Understanding codon optimality is key to comprehending cellular homeostasis and adaptation.
• This regulatory mechanism optimizes protein production for cellular functions.