Format

Send to

Choose Destination
Immunity. 2007 Dec;27(6):871-84.

Regulation of T cell receptor beta gene rearrangements and allelic exclusion by the helix-loop-helix protein, E47.

Author information

1
Horizontal Medical Research Organization, Graduate School of Medicine, Kyoto University, Kyoto 606-8501, Japan. yagata@mch.pref.osaka.jp

Abstract

Allelic exclusion of antigen-receptor genes is ensured primarily by monoallelic locus activation upon rearrangement and subsequently by feedback inhibition of continued rearrangement. Here, we demonstrated that the basic helix-loop-helix protein, E47, promoted T cell receptor beta (TCRbeta) gene rearrangement by directly binding to target gene segments to increase chromatin accessibility in a dosage-sensitive manner. Feedback signaling abrogated E47 binding, leading to a decline in accessibility. Conversely, enforced expression of E47 induced TCRbeta gene rearrangement by antagonizing feedback inhibition. Thus, the abundance of E47 is rate limiting in locus activation, and feedback signaling downregulates E47 activity to ensure allelic exclusion.

PMID:
18093539
DOI:
10.1016/j.immuni.2007.11.015
[Indexed for MEDLINE]
Free full text

Supplemental Content

Full text links

Icon for Elsevier Science
Loading ...
Support Center