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Related Concept Videos

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...
Mutations01:39

Mutations

Overview
Nucleotide Excision Repair01:08

Nucleotide Excision Repair

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Nucleotide Excision Repair01:38

Nucleotide Excision Repair

DNA Distortion and Damage
Cells are regularly exposed to mutagens—factors in the environment that can damage DNA and generate mutations. UV radiation is one of the most common mutagens and is estimated to introduce a significant number of changes in DNA. These include bends or kinks in the structure, which can block DNA replication or transcription. If these errors are not fixed, the damage can cause mutations, which in turn can result in cancer or disease depending on which sequences are...
Nucleotide Excision Repair01:08

Nucleotide Excision Repair

Overview
Spontaneous and Induced Mutations01:30

Spontaneous and Induced Mutations

Spontaneous mutations arise infrequently during DNA replication due to errors in the process. A key factor behind these errors is tautomeric shifts in nitrogenous bases, where bases transition from keto to enol forms or amino to imino forms. This shift can alter base-pairing rules, leading to mutations. Additionally, reactive oxygen species (ROS) arising from aerobic metabolism can damage DNA, resulting in depurination (loss of a purine base) or depyrimidination (loss of a pyrimidine base).

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Uracil-DNA Glycosylase Assay by Matrix-assisted Laser Desorption/Ionization Time-of-flight Mass Spectrometry Analysis
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UVA generates pyrimidine dimers in DNA directly.

Yong Jiang1, Mahir Rabbi, Minkyu Kim

  • 1Center for Biologically Inspired Materials and Material Systems, Duke University, Durham, North Carolina, USA.

Biophysical Journal
|February 3, 2009
PubMed
Summary

UVA radiation directly causes DNA damage, including cyclobutane pyrimidine dimers (CPDs) and abasic sites. This study used atomic force microscopy to reveal UVA

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Area of Science:

  • Molecular Biology
  • Photobiology
  • Genetics

Background:

  • UVA radiation, a major component of solar UV light, is increasingly recognized as genotoxic.
  • The precise mechanisms of UVA-induced DNA damage and the types of lesions formed remain unclear.
  • Existing research debates the significance of various UVA-induced DNA lesions and their mutagenic potential.

Purpose of the Study:

  • To directly quantify UVA-induced DNA damage at the single-molecule level using atomic force microscopy (AFM).
  • To elucidate the mechanisms by which UVA radiation generates DNA lesions.
  • To resolve controversies regarding the direct versus indirect formation of cyclobutane pyrimidine dimers (CPDs) by UVA.

Main Methods:

  • Atomic force microscopy (AFM) imaging of individual DNA molecules.
  • Utilizing DNA repair enzymes (endonuclease IV, T4 endonuclease V) and antibodies (anti-CPD) to probe DNA lesions.
  • Analysis of UVA-irradiated pUC18 plasmids and purified native/synthetic DNA.

Main Results:

  • AFM imaging directly quantified abasic sites and cyclobutane pyrimidine dimers (CPDs) induced by UVA radiation.
  • Approximately 40% of sites sensitive to T4 endonuclease V were identified as abasic sites, not CPDs.
  • Evidence strongly suggests UVA directly induces CPDs, contradicting theories requiring photosensitizers.

Conclusions:

  • UVA radiation directly generates both abasic sites and CPDs in DNA.
  • The study clarifies the relative abundance of different UVA-induced DNA lesions.
  • Findings challenge the prevailing hypothesis that photosensitizers are necessary for UVA-induced CPD formation.