Chromatin Remodeling by the T Cell Receptor (TCR)-beta Gene Enhancer During Early T Cell Development: Implications for the Control of TCR-beta Locus Recombination

Overview

Journal J Exp Med

Specialties Allergy & Immunology
General Medicine

Date 2000 Sep 7

PMID 10974029

Citations 53

Authors

N Mathieu

W M Hempel

S Spicuglia

C Verthuy

P Ferrier

Affiliations

Soon will be listed here.

Abstract

Gene targeting studies have shown that T cell receptor (TCR)-beta gene expression and recombination are inhibited after deletion of an enhancer (Ebeta) located at the 3' end of the approximately 500-kb TCR-beta locus. Using knockout mouse models, we have measured, at different regions throughout the TCR-beta locus, the effects of Ebeta deletion on molecular parameters believed to reflect epigenetic changes associated with the control of gene activation, including restriction endonuclease access to chromosomal DNA, germline transcription, DNA methylation, and histone H3 acetylation. Our results demonstrate that, in early developing thymocytes, Ebeta contributes to major chromatin remodeling directed to an approximately 25-kb upstream domain comprised of the Dbeta-Jbeta locus regions. Accordingly, treatment of Ebeta-deleted thymocytes with the histone deacetylase inhibitor trichostatin A relieved the block in TCR-beta gene expression and promoted recombination within the Dbeta-Jbeta loci. Unexpectedly, however, epigenetic processes at distal Vbeta genes on the 5' side of the locus and at the 3' proximal Vbeta14 gene appear to be less dependent on Ebeta, suggesting that Ebeta activity is confined to a discrete region of the TCR-beta locus. These findings have implications with respect to the developmental control of TCR-beta gene recombination, and the process of allelic exclusion at this locus.

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