Interrelations between translation and general mRNA degradation in yeast

Area of Science:

• Molecular Biology
• Gene Expression Regulation
• Cellular Stress Response

Background:

• Messenger RNA (mRNA) degradation is a critical control point in gene expression.
• Translation, including initiation and elongation, significantly influences mRNA stability.
• External stresses present a complex scenario, often inhibiting translation while unexpectedly stabilizing mRNA.

Purpose of the Study:

• To review mechanisms linking translation and mRNA degradation.
• To explore how external stresses modulate mRNA stability independently of translation.
• To discuss recent findings on mRNA decay during different translational states.

Main Methods:

• Review of existing literature on mRNA decay and translation.
• Analysis of models explaining the interplay between translation and mRNA stability.
• Focus on yeast as a model system for studying these processes.

Main Results:

• Reduced translation initiation typically promotes mRNA decapping and degradation.
• External stresses can induce mRNA stabilization at the rate-limiting step of decay, irrespective of translation inhibition.
• mRNA decay can occur even when ribosomes are elongating, not just on non-translating mRNAs.

Conclusions:

• The relationship between translation and mRNA degradation is complex and context-dependent.
• Cells utilize stress-induced mRNA stabilization to adapt to environmental changes.
• Further research is needed to fully elucidate the mechanisms governing mRNA decay during active translation.