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© Deriano Lab / Institut Pasteur
Chromosomes métaphasiques d’une cellule lymphoïde cancéreuse présentant une amplification des gènes Igh et c-myc
Publication : Nature

Rag mutations reveal robust alternative end joining

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in Nature - 27 Sep 2007

Corneo B, Wendland RL, Deriano L, Cui X, Klein IA, Wong SY, Arnal S, Holub AJ, Weller GR, Pancake BA, Shah S, Brandt VL, Meek K, Roth DB

Link to Pubmed [PMID] – 17898768

Nature 2007 Sep;449(7161):483-6

Mammalian cells repair DNA double-strand breaks (DSBs) through either homologous recombination or non-homologous end joining (NHEJ). V(D)J recombination, a cut-and-paste mechanism for generating diversity in antigen receptors, relies on NHEJ for repairing DSBs introduced by the Rag1-Rag2 protein complex. Animals lacking any of the seven known NHEJ factors are therefore immunodeficient. Nevertheless, DSB repair is not eliminated entirely in these animals: evidence of a third mechanism, ‘alternative NHEJ’, appears in the form of extremely rare V(D)J junctions and a higher rate of chromosomal translocations. The paucity of these V(D)J events has suggested that alternative NHEJ contributes little to a cell’s overall repair capacity, being operative only (and inefficiently) when classical NHEJ fails. Here we find that removing certain portions of murine Rag proteins reveals robust alternative NHEJ activity in NHEJ-deficient cells and some alternative joining activity even in wild-type cells. We propose a two-tier model in which the Rag proteins collaborate with NHEJ factors to preserve genomic integrity during V(D)J recombination.

http://www.ncbi.nlm.nih.gov/pubmed/17898768