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pubmed-article:15629432pubmed:dateCreated2005-1-4lld:pubmed
pubmed-article:15629432pubmed:abstractTextSomatic hypermutation (SHM) of immunoglobulin variable (V) region genes occurs in the germinal center (GC) B cells during immune responses, depending on activation-induced cytidine deaminase (AID). SHM is associated with resected double-strand DNA breaks (DSBs) which were shown to occur specifically in rearranged V regions in the GC B cells and CD40-stimulated B cells expressing AID. So far, endonucleases responsible for the DSBs have not been identified. Here we show that DNase gamma, a member of DNase I family of endonucleases, is expressed in GC B cells and CD40-stimulated B cells. Overexpression of DNase gamma in the mutation-competent Ramos B-cell line resulted in a marked increase in the resected but not blunt DSBs in the V region. Conversely, a selective DNase gamma inhibitor, DR396, suppressed the generation of the resected DSBs. These results suggest that DNase gamma is involved in the generation of resected DSBs associated with SHM.lld:pubmed
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pubmed-article:15629432pubmed:authorpubmed-author:ShiokawaDaisu...lld:pubmed
pubmed-article:15629432pubmed:authorpubmed-author:TanumaSei-ich...lld:pubmed
pubmed-article:15629432pubmed:authorpubmed-author:YoshimoriAtsu...lld:pubmed
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pubmed-article:15629432pubmed:authorpubmed-author:SunagaSatoshi...lld:pubmed
pubmed-article:15629432pubmed:authorpubmed-author:OkamotoMariko...lld:pubmed
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pubmed-article:15629432pubmed:authorpubmed-author:YashiroHisako...lld:pubmed
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pubmed-article:15629432pubmed:volume327lld:pubmed
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pubmed-article:15629432pubmed:pagination76-83lld:pubmed
pubmed-article:15629432pubmed:dateRevised2006-11-15lld:pubmed
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pubmed-article:15629432pubmed:year2005lld:pubmed
pubmed-article:15629432pubmed:articleTitleInvolvement of DNase gamma in the resected double-strand DNA breaks in immunoglobulin genes.lld:pubmed
pubmed-article:15629432pubmed:affiliationDivision of Molecular Biology, Research Institute for Biological Sciences, Tokyo University of Science, 2669 Yamazaki, Noda, Chiba 278-0022, Japan.lld:pubmed
pubmed-article:15629432pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:15629432pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed
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