The optimization of mRNA expression level by its intrinsic properties-Insights from codon usage pattern and...

Area of Science:

• Molecular Biology
• Genetics
• Bioinformatics

Background:

• Codon usage bias (CUB) and mRNA structural stability are intrinsic mRNA features linked to expression levels.
• The regulatory role of modulating these features on mRNA expression and structure remains incompletely understood.

Purpose of the Study:

• To investigate how codon usage bias and mRNA structural stability influence mRNA expression levels.
• To explore the impact of deviations from natural codon composition on mRNA expression and structure in Saccharomyces cerevisiae.

Main Methods:

• Analysis of wild-type Saccharomyces cerevisiae mRNA.
• Computational mutation of mRNAs to alter codon composition and structural stability.
• Correlation analysis between CUB, mRNA stability, and mRNA expression levels.

Main Results:

• In wild-type yeast, both CUB and mRNA stability positively correlate with mRNA expression.
• Alterations in natural codon composition disrupt the equilibrium between CUB, stability, and expression.
• Naturally occurring codon composition appears optimized for maximal mRNA expression and stability.

Conclusions:

• The natural codon composition of mRNA is crucial for optimizing gene expression.
• mRNA structural stability is a selected trait under natural codon usage patterns.
• Deviations from natural CUB and stability parameters can disrupt mRNA expression regulation.