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Functional long-range interactions of the IgH 3′ enhancers with the bcl-2 promoter region in t(14;18) lymphoma cells

Abstract

To better understand the mechanisms underlying the role of the immunoglobulin heavy-chain gene (IgH) 3′ enhancers on bcl-2 transcriptional deregulation in t(14;18) lymphoma, we characterized the physical interactions of the IgH 3′ enhancer region with the bcl-2 promoters. Using the chromosome conformation capture technique, we found that the IgH 3′ enhancers physically interact with the bcl-2 promoter region over a 350 kb genomic region in t(14;18) lymphoma cells. No interactions of the bcl-2 promoter region with sequences distant to the IgH enhancers were observed. The physical interactions of the IgH enhancers with the bcl-2 5′ region are functionally involved in the transcriptional control of bcl-2. The histone deacetylase inhibitor, trichostatin A, repressed bcl-2 transcription and decreased the IgH enhancer-bcl-2 promoter region interactions. We showed by chromatin immunoprecipitation assay and small interference RNA transfection studies that the POU2 family transcription factor Oct-2 and its cofactor Bob-1 have an important function in mediating the IgH enhancer-bcl-2 promoter region interactions. This study reveals a new aspect of the regulatory role of the IgH 3′ enhancers on bcl-2 transcription in t(14;18) lymphomas.

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Acknowledgements

This study was supported by National Institutes of Health Grant CA56764. We are grateful to Dr Job Dekker (U Mass) for advice and for providing the 3C protocol, and to Drs Tao Li, Jianqun Lin and Xinwen Qiu in Dr Andrew Hoffman's laboratory at Stanford University for expert assistance with the 3C analysis.

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Correspondence to L M Boxer.

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Duan, H., Xiang, H., Ma, L. et al. Functional long-range interactions of the IgH 3′ enhancers with the bcl-2 promoter region in t(14;18) lymphoma cells. Oncogene 27, 6720–6728 (2008). https://doi.org/10.1038/onc.2008.286

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