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Bross, L.* ; Wesoly, J.* ; Buerstedde, J.M. ; Kanaar, R.* ; Jacobs, H.*

Somatic hypermutation does not require Rad54 and Rad54B-mediated homologous recombination.

Eur. J. Immunol. 33, 352-357 (2003)
DOI PMC
Open Access Green möglich sobald Postprint bei der ZB eingereicht worden ist.
Secondary diversification of immunoglobulin (Ig) genes occurs through somatic hypermutation (SHM) in B cells of the germinal center (GC). The GC reaction is associated with a high frequency of DNA double-strand breaks (DSB) in the hypermutation domain of Ig genes. Homologous recombination (HR) is a prominent DSB repair pathway. Among the proteins involved in HR are the Rad-54 paralogues, Rad54 and Rad54B. To investigate whether Rad54/Rad54B-mediated HR is involved in SHM, we determined the ratio of mutated versus non-mutated Vlambda PCR products from memory (IgM-, IgD-, Vlambda1+) and GC (PNA(high), Vlambda1+) B cells, the mutation load, the mutation frequency, the base exchange pattern and the distribution of somatic mutations along the rearranged Vlambda light chain (VlambdaLC) genes. All these parameters of SHM were unaltered in memory and GC B cells lacking one or both Rad54 paralogues. Thus, our data indicate that Rad54 and Rad54B-mediated HR is not essential for SHM. In addition, the finding that the ablation of RAD51 paralogues causes an increase in SHM argues against a direct involvement of HR in promoting SHM.
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Publikationstyp Artikel: Journalartikel
Dokumenttyp Wissenschaftlicher Artikel
Schlagwörter Somatic hypermutation; Homologous recombination; Rad54; Immunoglobulin lambda light chain
ISSN (print) / ISBN 0014-2980
e-ISSN 1521-4141
Zeitschrift European Journal of Immunology
Quellenangaben Band: 33, Heft: 2, Seiten: 352-357 Artikelnummer: , Supplement: ,
Verlag Wiley
Verlagsort Hoboken
Begutachtungsstatus Peer reviewed
Institut(e) Institute of Molecular Radiation Biology (IMS)