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Related Experiment Videos

Techniques for gamma-H2AX detection.

Asako Nakamura1, Olga A Sedelnikova, Christophe Redon

  • 1Department of Environmental Sciences and Engineering, University of North Carolina, Chapel Hill, USA.

Methods in Enzymology
|June 24, 2006
PubMed
Summary
This summary is machine-generated.

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DNA double-strand breaks trigger rapid phosphorylation of histone H2AX into gamma-H2AX, forming detectable gamma-foci. These foci also appear spontaneously, increasing with aging and senescence.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Genetics

Background:

  • DNA double-strand breaks (DSBs) are critical DNA lesions.
  • Histone H2AX phosphorylation to gamma-H2AX is a rapid cellular response to DSBs.
  • gamma-H2AX foci serve as biomarkers for DNA damage.

Purpose of the Study:

  • To describe methods for detecting gamma-H2AX foci.
  • To illustrate the formation and dynamics of gamma-H2AX foci at DSB sites.
  • To highlight the presence of spontaneous gamma-foci in unstressed cells.

Main Methods:

  • Immunohistochemistry using anti-gamma-H2AX antibodies.
  • Microscopy techniques for visualizing foci in various cellular contexts.
  • Application of methods to cultured cells, metaphase spreads, tissues, and yeast.

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Main Results:

  • gamma-H2AX foci rapidly form at DSB sites.
  • Foci size increases within minutes and persists until DNA repair.
  • Non-induced, or cryptogenic, gamma-foci are observed and increase with aging.

Conclusions:

  • gamma-H2AX foci are reliable indicators of DNA DSBs.
  • Detection techniques are applicable across diverse biological systems.
  • Spontaneous gamma-foci suggest ongoing DNA damage or repair processes during aging.