Related Experiment Video

Updated: Aug 19, 2026

Investigation of Protein Recruitment to DNA Lesions Using 405 Nm Laser Micro-irradiation
12:29

Investigation of Protein Recruitment to DNA Lesions Using 405 Nm Laser Micro-irradiation

Published on: March 20, 2018

Skin cancer: lights on genome lesions

Keronninn M Lima-Bessa1, Carlos F M Menck

  • 1Department of Microbiology, Institute of Biomedical Sciences, São Paulo, SP, Brazil. kmlima@usp.br

Current Biology : CB
|January 26, 2005
PubMed

Insights

Sunlight causes skin damage by creating DNA lesions. Specific photolyase enzymes in new mice models show cyclobutane pyrimidine dimers are key to ultraviolet damage and skin cancer.

Area of Science:

  • Dermatology and Molecular Biology

Background:

  • Sunlight exposure is a primary cause of skin damage.
  • DNA lesions in epidermal cells are a key mechanism of photodamage.

Purpose of the Study:

  • To investigate the specific DNA lesions responsible for ultraviolet (UV)-induced skin damage.
  • To elucidate the role of cyclobutane pyrimidine dimers in UV-induced skin carcinogenesis.

Main Methods:

  • Development of transgenic mouse models expressing specific photolyase enzymes.
  • Analysis of DNA damage and mutation spectra in response to UV irradiation.

Main Results:

  • Transgenic mice expressing photolyases allowed for the identification of specific DNA photoproducts.
  • Cyclobutane pyrimidine dimers were confirmed as the predominant DNA lesions induced by UV radiation.
  • These dimers were found to be significantly involved in the development of UV-induced skin cancer.

Conclusions:

  • Cyclobutane pyrimidine dimers are the major DNA lesions driving UV-induced skin damage.
  • Targeting or repairing these specific DNA lesions may offer a strategy for preventing skin cancer.

More Related Videos

Advanced Confocal Microscopy Techniques to Study Protein-protein Interactions and Kinetics at DNA Lesions12:43

Advanced Confocal Microscopy Techniques to Study Protein-protein Interactions and Kinetics at DNA Lesions

Published on: November 12, 2017

Related Concept Videos

Skin Cancer01:30

Skin Cancer

Skin cancer is a type of cancer that occurs when there is an abnormal growth of skin cells, usually triggered by damage to the DNA within the skin cells. It is primarily caused by exposure to ultraviolet (UV) radiation from the sun or artificial sources like tanning beds. Skin cancer is the most common type of cancer worldwide, and its incidence continues to rise.
Basal Cell Carcinoma (BCC): BCC is the most common type of skin cancer, accounting for about 80% of cases. It typically develops in...
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 Repair01:38

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
Cancer-Critical Genes I: Proto-oncogenes01:33

Cancer-Critical Genes I: Proto-oncogenes

Genes usually encode proteins necessary for the proper functioning of a healthy cell. Mutations can often cause changes to the gene expression pattern, thereby altering the phenotype.
When the function of certain critical genes, especially those involved in cell cycle regulation and cell growth signaling cascades, gets disrupted, it upsets the cell cycle progression. Such cells with unchecked cell cycles start proliferating uncontrollably and eventually develop into tumors.
Such genes that act...