New insights into transcriptional reprogramming during cellular stress

Area of Science:

• Molecular Biology
• Cellular Biology
• Genetics

Background:

• Cellular stress necessitates adaptive transcriptional reprogramming for homeostasis.
• Stress responses involve coordinated changes in gene expression, including cyto-protective genes.
• Existing knowledge on transcriptional regulation during stress is fragmented across different stress types.

Purpose of the Study:

• To review the molecular mechanisms of transcriptional reprogramming during cellular stress.
• To highlight recent advances in understanding stress-induced transcriptional changes.
• To consolidate knowledge on transcription regulation in specific stress responses.

Main Methods:

• Literature review of recent research on cellular stress and transcription.
• Analysis of molecular mechanisms underlying transcriptional reprogramming.
• Focus on specific stress responses: heat-shock, unfolded protein, oxidative, and hypoxia.

Main Results:

• Cellular stress alters transcription by inducing protective genes and repressing cell cycle/metabolic genes.
• Transcriptional induction involves stress-responsive factors releasing stalled RNA polymerase II.
• Transcriptional repression involves factors retaining RNA polymerase II in a paused state.

Conclusions:

• Transcriptional reprogramming is a fundamental cellular response to stress.
• Massive enhancer activation and chromatin remodeling are key regulatory events.
• Understanding these mechanisms is vital for comprehending cellular adaptation and survival.