Gene-specific transcript buffering revealed by perturbation of coactivator complexes.

Area of Science:

• Molecular Biology
• Gene Regulation
• RNA Metabolism

Background:

• Transcript buffering maintains stable RNA levels via coordinated mRNA synthesis and degradation.
• Existing models suggest a global link between mRNA synthesis and degradation, but mechanisms are poorly understood.

Purpose of the Study:

• To investigate the mechanisms of transcript buffering at a gene-specific level.
• To determine if transcript buffering is a general cellular response.
• To elucidate the role of transcriptional coactivators in RNA metabolism.

Main Methods:

• Utilized RNA sequencing on nuclear, cytoplasmic, and newly synthesized transcript fractions.
• Employed biophysical modeling in mouse embryonic stem cells.
• Depleted TIP60/KAT5 and disrupted the ATAC coactivator complex to study RNA metabolism changes.

Main Results:

• Depletion of TIP60/KAT5 resulted in gene-specific transcript buffering.
• Transcriptional changes were counterbalanced by alterations in RNA nuclear export and cytoplasmic stability.
• Disruption of the ATAC complex also induced gene-specific transcript buffering.

Conclusions:

• Transcript buffering operates at a gene-specific level, not globally.
• Cells dynamically regulate RNA splicing, export, and degradation to maintain homeostasis.
• Transcriptional coactivators play a crucial role in mediating gene-specific RNA buffering.