What question did this study set out to answer?

Investigate the role of the MRN complex in repairing Rag endonuclease-generated DNA double-strand breaks during V(D)J recombination in G1-phase lymphocytes.

February 16, 2009The Journal of Experimental MedicineOpen Access

MRN complex function in the repair of chromosomal Rag-mediated DNA double-strand breaks

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Authors

BHBeth A. HelminkThe University of Texas MD Anderson Cancer Center ABAndrea BredemeyerHeart Failure & Transplant BLBaeck-Seung LeeThe University of Texas at Austin

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Implication

Mechanistic study demonstrates that MRN deficiency disrupts Rag-mediated DNA break repair in developing lymphocytes, indicating that MRN and ATM coordinate antigen receptor assembly.

Key Points

Investigate the role of the MRN complex in repairing Rag endonuclease-generated DNA double-strand breaks during V(D)J recombination in G1-phase lymphocytes.
Evaluated chromosomal double-strand break repair during antigen receptor gene assembly in MRN-deficient developing lymphocyte models.
Assessed coding-end joining defects and compared phenotypic patterns between MRN-deficient and ATM-deficient lymphocytes.
MRN deficiency leads to aberrant joining of Rag-induced double-strand breaks and causes the accumulation of unrepaired coding ends during V(D)J recombination.
Repair defects in MRN-deficient lymphocytes mirror those observed in ATM deficiency, establishing that MRN and ATM operate within the same DNA damage response pathway during antigen receptor assembly.

Cite This Study

Helmink et al. (2009) studied this question.

synapsesocial.com/papers/6aaa0f12788c57f1c6a4e78c https://doi.org/10.1084/jem.20081326

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Implication

Mechanistic study demonstrates that MRN deficiency disrupts Rag-mediated DNA break repair in developing lymphocytes, indicating that MRN and ATM coordinate antigen receptor assembly.

MRN complex function in the repair of chromosomal Rag-mediated DNA double-strand breaks

Discussion

Member takes

Implication

Key Points

Cite This Study

MRN complex function in the repair of chromosomal Rag-mediated DNA double-strand breaks

Discussion

Member takes

Implication

Key Points

Cite This Study

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