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Parp3 negatively regulates immunoglobulin class switch recombination.

Isabelle Robert1, Léa Gaudot1, Mélanie Rogier1

  • 1Institut de Génétique et de Biologie Moléculaire et Cellulaire, Illkirch, France; Institut National de la Santé et de la Recherche Médicale, U964, Illkirch, France; Centre National de Recherche Scientifique, UMR7104, Illkirch, France; Université de Strasbourg, Illkirch, France.

Plos Genetics
|May 23, 2015
PubMed
Summary

Poly (ADP-ribose) polymerase 3 (Parp3) deficiency enhances B cell class switch recombination (CSR) by increasing activation-induced cytidine deaminase (AID) at switch regions. Somatic hypermutation (SHM) is unaffected.

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Area of Science:

  • Immunology
  • Molecular Biology
  • Genetics

Background:

  • B cells diversify antibody repertoire via programmed DNA damage.
  • Somatic hypermutation (SHM) and class switch recombination (CSR) involve activation-induced cytidine deaminase (AID) and DNA repair factors like Parp1 and Parp2.

Purpose of the Study:

  • To investigate the role of Poly (ADP-ribose) polymerase 3 (Parp3) in CSR and SHM.
  • To elucidate the mechanism by which Parp3 influences these immune processes.

Main Methods:

  • Analysis of CSR and SHM in Parp3-deficient models.
  • Assessment of AID occupancy at immunoglobulin loci.
  • Evaluation of DNA damage and repair pathway utilization.

Main Results:

  • Parp3 deficiency leads to enhanced CSR.
  • SHM remains unaffected in Parp3-deficient cells.
  • Increased AID occupancy at the donor (Sμ) switch region observed.
  • Elevated DNA damage at switch region junctions and a bias towards alternative end joining in Parp3-deficient cells.

Conclusions:

  • Parp3 plays a specific role in regulating CSR.
  • Parp3 controls AID levels at switch regions during CSR, influencing DNA repair pathway choice.