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• W1546331339 endingPage "3716" @default.
• W1546331339 startingPage "3707" @default.
• W1546331339 abstract "Class switch recombination (CSR) and somatic hypermutation (SHM) are mechanistically related processes that share common key factors such as activation-induced cytidine deaminase. We have previously shown a role for ATM (mutated in ataxia-telangiectasia) in CSR. In this paper we show that the frequency, distribution, and nature of base pair substitutions in the Ig variable (V) heavy chain genes in ataxia-telangiectasia patients are largely similar to those in normal donors, suggesting a normal SHM process. Characterization of the third complementarity-determining region in B cells from ataxia-telangiectasia patients also shows a normal V(D)J recombination process. SHM-like mutations could be identified in the switch (S) mu region (up to several hundred base pairs upstream of the S mu -S(alpha) breakpoints) in normal in vivo switched human B cells. In the absence of ATM, mutations can still be found in this region, but at less than half the frequency of that in normal donors. The latter mutations are mainly due to transitions (86% compared with 58% in controls) and are biased to A or T nucleotides. An ATM-dependent mechanism, different from that generating SHM in V genes, is therefore likely to be involved in introducing SHM-like mutations in the S region. ATM may thus be one of the factors that is not shared by the CSR and SHM processes." @default.
• W1546331339 created "2016-06-24" @default.
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• W1546331339 date "2003-04-01" @default.
• W1546331339 modified "2023-10-03" @default.
• W1546331339 title "ATM Is Not Required in Somatic Hypermutation of VH, but Is Involved in the Introduction of Mutations in the Switch μ Region" @default.
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• W1546331339 doi "https://doi.org/10.4049/jimmunol.170.7.3707" @default.
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• W1546331339 hasPublicationYear "2003" @default.
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