Silencing and Nuclear Repositioning of the λ5 Gene Locus at the Pre-B Cell Stage Requires Aiolos and OBF-1

The chromatin regulator Aiolos and the transcriptional coactivator OBF-1 have been implicated in regulating aspects of B cell maturation and activation. Mice lacking either of these factors have a largely normal early B cell development. However, when both factors are eliminated simultaneously a blo...

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Published inPloS one Vol. 3; no. 10; p. e3568
Main Authors Karnowski, Alexander, Cao, Chun, Matthias, Gabriele, Carotta, Sebastian, Corcoran, Lynn M., Martensson, Inga-Lill, Skok, Jane A., Matthias, Patrick
Format Journal Article
LanguageEnglish
Published San Francisco Public Library of Science 30.10.2008
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Summary:The chromatin regulator Aiolos and the transcriptional coactivator OBF-1 have been implicated in regulating aspects of B cell maturation and activation. Mice lacking either of these factors have a largely normal early B cell development. However, when both factors are eliminated simultaneously a block is uncovered at the transition between pre-B and immature B cells, indicating that these proteins exert a critical function in developing B lymphocytes. In mice deficient for Aiolos and OBF-1, the numbers of immature B cells are reduced, small pre-BII cells are increased and a significant impairment in immunoglobulin light chain DNA rearrangement is observed. We identified genes whose expression is deregulated in the pre-B cell compartment of these mice. In particular, we found that components of the pre-BCR, such as the surrogate light chain genes λ5 and VpreB, fail to be efficiently silenced in double-mutant mice. Strikingly, developmentally regulated nuclear repositioning of the λ5 gene is impaired in pre-B cells lacking OBF-1 and Aiolos. These studies uncover a novel role for OBF-1 and Aiolos in controlling the transcription and nuclear organization of genes involved in pre-BCR function.
Bibliography:Conceived and designed the experiments: AK JAS PM. Performed the experiments: AK CC GM JAS. Analyzed the data: AK CC GM SC LC ILM JAS PM. Contributed reagents/materials/analysis tools: AK CC GM SC LC ILM JAS. Wrote the paper: AK PM.
ISSN:1932-6203
1932-6203
DOI:10.1371/journal.pone.0003568