CTCF binds to sites in the major histocompatibility complex that are rapidly reconfigured in response to interferon-gamma

D. Ottaviani,Elliott Lever,Shihong Mao,R. Christova,B. Ogunkolade,T. Jones,J. Szary,Johan Aarum,Muhammad A. Mumin,Christopher A Pieri,S. Krawetz,D. Sheer

Published 2012 in Nucleic Acids Research

ABSTRACT

Activation of the major histocompatibility complex (MHC) by interferon-gamma (IFN−γ) is a fundamental step in the adaptive immune response to pathogens. Here, we show that reorganization of chromatin loop domains in the MHC is evident within the first 30 min of IFN−γ treatment of fibroblasts, and that further dynamic alterations occur up to 6 h. These very rapid changes occur at genomic sites which are occupied by CTCF and are close to IFN−γ-inducible MHC genes. Early responses to IFN−γ are thus initiated independently of CIITA, the master regulator of MHC class II genes and prepare the MHC for subsequent induction of transcription.

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