Cellular energy regulates mRNA degradation in a codon-specific manner

Area of Science:

• Molecular Biology
• Gene Expression Regulation
• Cellular Metabolism

Background:

• Codon optimality significantly impacts messenger RNA (mRNA) translation and degradation rates.
• The precise mechanisms governing the regulation of codon optimality's effects are not well understood.
• Understanding these mechanisms is crucial for comprehending gene expression control.

Purpose of the Study:

• To investigate the regulation of codon optimality's effects on mRNA stability.
• To identify the mechanisms through which codon optimality's influence is modulated.
• To explore the relationship between cellular energy metabolism and codon usage effects.

Main Methods:

• Analysis of mRNA stability variations across different human tissues.
• Mathematical modeling to simulate the impact of cellular energy on codon effects.
• Experimental perturbations including oxygen deprivation and ATP synthesis inhibition.

Main Results:

• Codon optimality accounts for up to 2-fold changes in mRNA stability between human tissues.
• The effect of codon optimality is reduced in tissues with high energy metabolism.
• Codon optimality's influence increases with age.
• Cellular energy variations non-uniformly alter codon usage effects, independent of tRNA regulation.

Conclusions:

• Cellular energy metabolism represents a novel regulatory mode for codon optimality's effects on gene expression.
• This finding establishes a fundamental mechanistic link between cellular energy status and eukaryotic gene expression.
• The regulation is independent of transfer RNA (tRNA) availability, highlighting a new pathway in gene expression control.