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Saberi, A.* ; Nakahara, M.* ; Sale, J.E.* ; Kikuchi, K.* ; Arakawa, H. ; Buerstedde, J.M. ; Yamamoto, K.* ; Takeda, S.* ; Sonoda, E.*

The 9-1-1 DNA clamp is required for immunoglobulin gene conversion.

Mol. Cell. Biol. 28, 6113-6122 (2008)
DOI
Open Access Green möglich sobald Postprint bei der ZB eingereicht worden ist.
Chicken DT40 cells deficient in the 9-1-1 checkpoint clamp exhibit hypersensitivity to a variety of DNA-damaging agents. Although recent work suggests that, in addition to its role in checkpoint activation, this complex may play a role in homologous recombination and translesion synthesis, the cause of this hypersensitivity has not been studied thoroughly. The immunoglobulin locus of DT40 cells allows monitoring of homologous recombination and translesion synthesis initiated by activation-induced deaminase (AID)-dependent abasic sites. We show that both the RAD9(-/-) and RAD17(-/-) mutants exhibit substantially reduced immunoglobulin gene conversion. However, the level of nontemplated immunoglobulin point mutation increased in these mutants, a finding that is reminiscent of the phenotype resulting from the loss of RAD51 paralogs or Brca2. This suggests that the 9-1-1 complex does not play a central role in translesion synthesis in this context. Despite reduced immunoglobulin gene conversion, the RAD9(-/-) and RAD17(-/-) cells do not exhibit a prominent defect in double-strand break-induced gene conversion or a sensitivity to camptothecin. This suggests that the roles of Rad9 and Rad17 may be confined to a subset of homologous recombination reactions initiated by replication-stalling lesions rather than those associated with double-strand break repair.
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Publikationstyp Artikel: Journalartikel
Dokumenttyp Wissenschaftlicher Artikel
Schlagwörter 9-1-1 DNA clamp; immunoglobulin; gene conversion
ISSN (print) / ISBN 0270-7306
e-ISSN 1098-5549
Quellenangaben Band: 28, Heft: 19, Seiten: 6113-6122 Artikelnummer: , Supplement: ,
Verlag American Society for Microbiology (ASM)
Begutachtungsstatus Peer reviewed
Institut(e) Institute of Molecular Radiation Biology (IMS)