Haddad D, Puget N, Laviolette-Malirat N, Conte C, Khamlichi AA. Seeking sense of antisense switch transcripts.
Transcription 2011;
2:183-188. [PMID:
21922061 DOI:
10.4161/trns.2.4.16784]
[Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2011] [Revised: 06/03/2011] [Accepted: 06/03/2011] [Indexed: 11/19/2022] Open
Abstract
In B lymphocytes, class switch recombination (CSR) machinery targets highly repetitive sequences, called switch (S) sequences, in the constant domain of the immunoglobulin heavy chain (IgH) locus. Cotranscriptional generation of R loops at S sequences provides the substrate for the mutagenic enzyme AID (Activation-Induced cytidine Deaminase), which initiates the DNA breaks at the transcribed sequences. Both sense and antisense transcripts across the S regions have been reported. Our recent work shows that, unlike its sense counterpart, antisense transcription of S sequences is dispensable for CSR in vivo.
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