Jacobs H, Puglisi A, Rajewsky K, Fukita Y. Tuning somatic hypermutation by transcription.
Curr Top Microbiol Immunol 1999;
246:149-58; discussion 159. [PMID:
10396051 DOI:
10.1007/978-3-642-60162-0_19]
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Abstract
The dependence of somatic hypermutation on transcription was studied in three mutant immunoglobulin heavy chain (IgH) insertion mice in which a targeted non-functional VHB1-8 passenger transgene was either placed under the transcriptional control of a truncated DQ52 promoter (p delta), its own RNA polymerase II dependent IgH promoter (pII) or a RNA polymerase I dependent promoter (pI). The relative mutation-frequency of the VHB1-8 passenger transgene in memory B cells of p delta, pI and pII mice (7%, 60% and 100%) correlated with the relative levels of transgene-specific pre-mRNA expressed in germinal center B cells isolated from the mutant mice (8%, 72% and 100%, respectively). These data indicate that the mutation load of rearranged Ig genes can be tuned by transcription. The question, whether somatic hypermutation requires transcription per se or a specific component of the RNA polymerase II complex, is under investigation.
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