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DNA double-strand breaks activate a multi-functional genetic program in developing lymphocytes

Andrea L Bredemeyer1, Beth A Helmink, Cynthia L Innes

  • 1Department of Pathology and Immunology, Washington University School of Medicine, St. Louis, Missouri 63110, USA.

Nature
|October 14, 2008
PubMed

Insights

Physiological DNA double-strand breaks in lymphocytes activate a broad transcriptional program beyond DNA repair. This response influences lymphocyte development and may be disrupted by genotoxic damage.

Area of Science:

  • Molecular Biology
  • Immunology
  • Genetics

Background:

  • DNA double-strand breaks (DSBs) are critical DNA lesions.
  • Cellular responses to DSBs typically involve cell-cycle checkpoints and survival pathways.
  • DSBs are intentionally generated during lymphocyte development for antigen receptor gene assembly.

Purpose of the Study:

  • To investigate the transcriptional response to physiological DSBs during lymphocyte development.
  • To determine if this response differs from the canonical DSB response.
  • To explore the implications for lymphocyte development and genotoxic damage.

Main Methods:

  • Analysis of gene expression in murine lymphocytes.
  • Comparison of transcriptional profiles following physiological and genotoxic DSB induction.

Main Results:

  • Physiological DSBs in lymphocytes trigger a broad transcriptional program.
  • This program extends beyond canonical DNA damage response genes.
  • Many induced genes are involved in diverse cellular processes crucial for lymphocyte development.
  • Some gene expression patterns overlap between physiological and genotoxic DSB responses.

Conclusions:

  • Physiological DSBs act as signaling cues regulating cell-type-specific processes beyond genome maintenance.
  • Genotoxic DSBs may impair normal cellular functions by interfering with these developmental pathways.
  • Understanding these distinct transcriptional programs is vital for lymphocyte biology and toxicology.

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