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- W1982243668 abstract "Activation-induced cytosine deaminase (AID) is essential for both somatic hypermutation (SHM) and class switch recombination (CSR), two processes involved in antibody diversification. Previously, various groups showed both in vitro and in vivo that AID initiates SHM and CSR by deaminating cytosines in DNA in a transcription-dependent manner. Although in vivo both DNA strands are equally targeted by AID, many in vitro and bacterial experiments found that AID almost exclusively targets the nontemplate strand of a transcribed substrate. Here, we report the detection of antisense transcripts in assembled Ig heavy chain (IgH) variable region exons and their immediate downstream region, as well as in switch regions, sequences that, respectively, are targets for SHM and CSR in vivo . In contrast, we did not detect antisense transcripts from the Cμ constant region exons, which lie between the IgH variable region exons and downstream S regions and which are not normally an AID target. Expression of the antisense variable region/flanking region and the S-region transcripts were found in all lymphocytes that transcribe these sequences in the sense direction. Steady-state levels of antisense transcripts appeared very low, and start sites potentially appeared heterogeneous. We discuss the potential implications of antisense IgH locus transcription for AID targeting or other processes." @default.
- W1982243668 created "2016-06-24" @default.
- W1982243668 creator A5028730363 @default.
- W1982243668 creator A5033821931 @default.
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- W1982243668 date "2008-03-11" @default.
- W1982243668 modified "2023-09-23" @default.
- W1982243668 title "Antisense transcripts from immunoglobulin heavy-chain locus V(D)J and switch regions" @default.
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- W1982243668 doi "https://doi.org/10.1073/pnas.0712291105" @default.
- W1982243668 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2268805" @default.
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