Antisense transcription-dependent chromatin signature modulates sense transcript dynamics

Area of Science:

• Genomics
• Molecular Biology
• Epigenetics

Background:

• Antisense transcription is a prevalent genomic phenomenon across diverse organisms.
• A conserved chromatin signature is associated with antisense transcription in both yeast and human genes.

Purpose of the Study:

• To investigate the functional implications of the antisense transcription-associated chromatin signature.
• To elucidate the mechanisms by which antisense transcription influences sense gene expression.

Main Methods:

• Quantitative RNA-FISH was employed to analyze transcript localization.
• A mathematical model was developed to describe transcription and degradation dynamics.
• Chromatin modification, specifically Set3C histone deacetylase activity, was manipulated.

Main Results:

• Altering antisense transcript levels modified sense transcript distribution between the nucleus and cytoplasm.
• High antisense transcription at GAL1 reduced sense transcript production and processing but increased stability.
• Genome-wide analysis confirmed a link between antisense transcription and transcript stability.
• Disrupting the Set3C complex mimicked these effects even without antisense transcription.

Conclusions:

• Antisense transcription dynamically regulates sense transcription through chromatin-dependent mechanisms.
• The observed chromatin signature plays a crucial role in mediating these regulatory effects.
• Antisense transcription impacts multiple stages of gene expression, including production, processing, and stability.