Molecular basis of transcriptional pausing, stalling, and transcription-coupled repair initiation

Area of Science:

• Molecular Biology
• Genetics
• Biochemistry

Background:

• Transcription elongation by RNA polymerase II (Pol II) is frequently impeded by various obstacles.
• These impediments, including DNA lesions and protein binding, can cause transcriptional pausing or stalling.
• Prolonged stalling, especially from DNA lesions, contributes to genome instability, cellular dysfunction, and cell death.

Purpose of the Study:

• To review recent advances in understanding the molecular mechanisms of transcriptional pausing and stalling.
• To discuss novel findings regarding RNA polymerase II (Pol II)-mediated recognition of DNA lesions.
• To explore the specific roles of Cockayne Syndrome B (CSB) protein within the transcription-coupled nucleotide excision repair (TC-NER) pathway.

Main Methods:

• Literature review of recent research on transcription, DNA repair, and associated proteins.
• Analysis of molecular mechanisms underlying transcriptional blockage.
• Synthesis of current knowledge on lesion recognition and repair pathway components.

Main Results:

• Detailed summary of diverse obstacles causing Pol II pausing and stalling.
• Elucidation of Pol II's role in identifying transcription-blocking DNA lesions.
• Highlighting the functional significance of CSB in TC-NER pathway activation and execution.

Conclusions:

• Understanding Pol II pausing is crucial for comprehending genome stability.
• TC-NER is a critical pathway for resolving transcription-blocking DNA lesions.
• CSB plays a pivotal role in TC-NER, linking transcription to DNA repair.