Antisense expression increases gene expression variability and locus interdependency

Area of Science:

• Molecular Biology
• Genetics
• Gene Regulation

Background:

• Non-coding RNAs, specifically antisense transcripts, are widely expressed but their functions remain largely unknown.
• Understanding the role of antisense expression in gene regulation is crucial for deciphering complex cellular processes.

Purpose of the Study:

• To systematically analyze sense-antisense expression patterns in yeast under various conditions.
• To investigate the functional role of antisense transcription in gene regulation, particularly its impact on expression variability and response dynamics.

Main Methods:

• Genome-wide transcription profiling in yeast.
• Analysis of sense-antisense expression in response to genetic and environmental changes.
• Disruption of antisense transcription to assess regulatory effects on specific genes (e.g., SUR7).

Main Results:

• Antisense expression is linked to genes with higher expression variability, exhibiting an 'on-off' switch-like behavior.
• Genes requiring rapid or environment-specific responses, such as stress-response genes, are enriched for antisense expression.
• Evidence suggests antisense expression from bidirectional promoters can propagate regulatory signals to neighboring genes.

Conclusions:

• Antisense expression plays a significant role in modulating gene regulation, acting as a switch for gene activity.
• Antisense-initiating regions downstream of genes are important regulatory elements that should be considered in gene regulation models.