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Transcription and DNA adducts: what happens when the message gets cut off?

David A Scicchitano1, Eugenia C Olesnicky, Alexandra Dimitri

  • 1Department of Biology, New York University, 1009 Silver Center, 100 Washington Square East, New York, NY 10003, USA. das2@nyu.edu

DNA Repair
|October 12, 2004
PubMed

Insights

DNA damage in genes can stall RNA polymerase, causing truncated RNA. Subtle DNA adduct structural features, not just the lesion type, determine if elongation is blocked.

Area of Science:

  • Molecular Biology
  • Biochemistry
  • Genetics

Background:

  • DNA damage within transcription units can impede RNA polymerase progression.
  • The reasons why some DNA lesions block elongation while others do not are not fully understood.

Purpose of the Study:

  • To investigate the factors influencing RNA polymerase behavior when encountering DNA adducts during elongation.
  • To elucidate the structural determinants of lesion bypass or stalling.

Main Methods:

  • Utilizing site-specifically damaged DNA templates.
  • Analyzing the progression of elongating transcription complexes.

Main Results:

  • A wide range of DNA lesions can impede transcription elongation.
  • Subtle structural elements of DNA adducts significantly influence RNA polymerase pausing and bypass.
  • Key factors include the polymerase active site's accommodation ability, adduct size/shape, stereochemistry, incorporated base, and local DNA sequence.

Conclusions:

  • The impact of DNA damage on transcription is modulated by intricate structural characteristics of the adduct.
  • Understanding these structural elements is crucial for predicting the functional consequences of DNA damage on gene expression.

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