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Nucleotide Excision Repair01:08

Nucleotide Excision Repair

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Mutations01:35

Mutations

Mutations are changes in the sequence of DNA. These changes can occur spontaneously or they can be induced by exposure to environmental factors. Mutations can be characterized in a number of different ways: whether and how they alter the amino acid sequence of the protein, whether they occur over a small or large area of DNA, and whether they occur in somatic cells or germline cells.
Chromosomal Alterations Are Large-Scale Mutations
While point mutations are changes in a single nucleotide in...

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Atomic Force Microscopy Investigations of DNA Lesion Recognition in Nucleotide Excision Repair
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Published on: May 24, 2017

Detecting ultraviolet damage in single DNA molecules by atomic force microscopy.

Yong Jiang1, Changhong Ke, Piotr A Mieczkowski

  • 1Center for Biologically Inspired Materials and Material Systems and Department of Mechanical Engineering and Materials Science, Duke University, Durham, NC 27708, USA.

Biophysical Journal
|May 8, 2007
PubMed
Summary

Atomic force microscopy (AFM) detects and quantifies ultraviolet (UV) DNA damage at the single-molecule level. This method reveals UV-induced DNA degradation and cyclobutane pyrimidine dimers (CPDs), complementing traditional techniques for precise UV damage assessment.

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Area of Science:

  • Molecular Biology
  • Biophysics
  • Nanotechnology

Background:

  • Ultraviolet (UV) radiation causes DNA damage, primarily through cyclobutane pyrimidine dimers (CPDs).
  • Traditional methods for detecting UV-induced DNA damage have limitations in resolution and sensitivity.
  • Atomic force microscopy (AFM) offers potential for high-resolution imaging of biological molecules.

Purpose of the Study:

  • To develop and validate a single-molecule detection method for UV-induced DNA damage using AFM.
  • To quantify DNA degradation and CPD formation at various UV doses (UVB and UVC).
  • To compare AFM-based detection with traditional methods like agarose gel electrophoresis.

Main Methods:

  • Combined supercoiled plasmid relaxation assay with AFM imaging.
  • Utilized T4 Endonuclease V treatment to detect low-dose UVB damage.
  • Employed photolyase to mark UV lesions for AFM quantification.
  • Verified AFM findings using agarose gel electrophoresis.

Main Results:

  • High doses of UVB and UVC caused significant DNA degradation and plasmid relaxation.
  • AFM detected approximately 0.5 CPD per plasmid at low UVB doses.
  • A linear relationship was observed between low UVB dose and CPD formation (4.4 CPDs/Mbp/J/m²).
  • AFM sensitivity increased with plasmid size.
  • AFM results were consistent with plasmid relaxation assays and gel electrophoresis.

Conclusions:

  • AFM provides a sensitive, high-resolution method for detecting and quantifying UV-induced DNA damage, including degradation and CPDs.
  • The study validates AFM as a complementary tool to traditional DNA damage assessment techniques.
  • AFM enables single-molecule level analysis of DNA damage, offering new insights into UV radiation effects.