Question

How does transcription-coupled NER differ from global genome NER? 

   How does transcription-coupled NER differ from global genome NER?
Molecular Biology
Molecular Biology
Robert F. Weaver 5th Edition
Chapter 20, Problem 27 ↓

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The process involves the recognition and removal of a short single-stranded DNA segment containing the lesion, followed by DNA synthesis to fill the resulting gap and ligation to restore the DNA strand.  Show more…

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How does transcription-coupled NER differ from global genome NER?
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Key Concepts

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Nucleotide Excision Repair (NER)
NER is a fundamental DNA repair mechanism responsible for removing bulky DNA lesions and distortions in the double helix structure. It involves the recognition, excision, and replacement of damaged DNA across the genome to maintain genetic stability and prevent mutagenesis.
Transcription-Coupled NER
Transcription-coupled NER is a specialized sub-pathway of NER that specifically targets and repairs DNA lesions on the template strand of actively transcribed genes. When RNA polymerase stalls at a lesion, this pathway is activated to rapidly remove the damage, ensuring that transcription can resume promptly and that gene expression is not disrupted.
Global Genome NER
Global genome NER is another branch of the NER system that operates throughout the entire genome, scanning and repairing DNA damage irrespective of transcriptional activity. This pathway provides a general surveillance mechanism to maintain overall genomic integrity by recognizing and removing lesions in both active and inactive regions of the DNA.
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