Initiation of Allelic Exclusion by Stochastic Interaction of Tcrb Alleles with Repressive Nuclear Compartments

Overview

Journal Nat Immunol

Date 2008 Jun 10

PMID 18536719

Citations 43

Authors

Ryan J Schlimgen

Karen L Reddy

Harinder Singh

Michael S Krangel

Affiliations

Soon will be listed here.

Abstract

Studies of antigen-receptor loci have linked directed monoallelic association with pericentromeric heterochromatin to the initiation or maintenance of allelic exclusion. Here we provide evidence for a fundamentally different basis for T cell antigen receptor-beta (Tcrb) allelic exclusion. Using three-dimensional immunofluorescence in situ hybridization, we found that germline Tcrb alleles associated stochastically and at high frequency with the nuclear lamina or with pericentromeric heterochromatin in developing thymocytes and that such interactions inhibited variable-to-diversity-joining (V(beta)-to-D(beta)J(beta)) recombination before beta-selection. The introduction of an ectopic enhancer into Tcrb resulted in fewer such interactions and impaired allelic exclusion. We propose that initial V(beta)-to-D(beta)J(beta) recombination events are generally monoallelic in developing thymocytes because of frequent stochastic, rather than directed, interactions of Tcrb alleles with repressive nuclear compartments. Such interactions may be essential for Tcrb allelic exclusion.

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