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International Immunology Advance Access published online on May 20, 2005
International Immunology, doi:10.1093/intimm/dxh261
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© The Japanese Society for Immunology. 2005. All rights reserved. For permissions, please e-mail: journals.permissions@oupjournals.org
Received September 2, 2004
Accepted March 14, 2005

Article

Distribution of the chromatin protein DEK distinguishes active and inactive CD21/CR2 gene in pre- and mature B lymphocytes

Hong-gang Hu 1*, Harald Illges 1, Claudia Gruss 1, and Rolf Knippers 1

1 Department of Biology, University of Konstanz, D-78457 Konstanz, Germany

* To whom correspondence should be addressed.
Hong-gang Hu, E-mail: hong-gang.hu{at}uni-konstanz.de


  Abstract

DEK is an abundant and ubiquitous chromatin protein that has only recently attracted attention. DEK preferentially binds to cruciform and superhelical DNA and induces positive supercoils into closed circular DNA. It is quite likely therefore that DEK performs an important architectural function in chromatin. However, it is not known how DEK is distributed in chromatin. As the first study of its kind, we investigate the distribution of DEK at the CD21/complement receptor 2 gene regulatory regions in two B lymphocyte lines, namely Ramos, which expresses the CD21 gene, and Nalm-6, which does not. We use a chromatin immunoprecipitation approach and show that DEK appears to be distributed over various regions of the expressed and silent genes, but occurs in 2- to 3-fold higher amounts at a promoter-proximal site of the expressed gene. Moreover, induction of CD21 expression in Nalm-6 cells leads to accumulation of DEK at this site. We propose that the accumulation of DEK is functionally linked to gene expression.

Keywords: CD21/CR2; chromatin immunoprecipitation; DEK; promoter.
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