Histone modifications, but not nucleosomal positioning, correlate with major histocompatibility complex class I promoter activity in different tissues in vivo.
To examine the role of chromatin in transcriptional regulation of the major histocompatibility complex (MHC) class I gene, we determined nucleosome occupancy and positioning, histone modifications, and H2A.Z occupancy across its regulatory region in murine tissues that have widely different expression levels. Surprisingly, nucleosome occupancy and positioning were indistinguishable between the spleen, kidney, and brain. In all three tissues, the 200 bp upstream of the transcription start site had low nucleosome occupancy. In contrast, nuclease hypersensitivity, histone modifications, and H2A.Z occupancy showed tissue-specific differences. Thus, tissue-specific differences in MHC class I transcription correlate with histone modifications and not nucleosomal organization. Further, activation of class I transcription by gamma interferon or its inhibition by alpha-amanitin did not alter nucleosome occupancy, positioning, nuclease hypersensitivity, histone modifications, or H2A.Z occupancy in any of the tissues examined. Thus, chromatin remodeling was not required to dynamically modulate transcriptional levels. These findings suggest that the MHC class I promoter remains poised and accessible to rapidly respond to infection and environmental cues.
Kotekar
Aparna S
AS
Molecular Regulation Section, Experimental Immunology Branch, National Cancer Institute, National Institutes of Health, NIH, Bethesda, MD 20892, USA.
Weissman
Jocelyn D
JD
Gegonne
Anne
A
Cohen
Helit
H
Singer
Dinah S
DS
D000818:Animals; D001921:Brain / Q000166:cytology / Q000378:metabolism; D002478:Cells, Cultured; D002843:Chromatin / Q000235:genetics / Q000378:metabolism*; D005786:Gene Expression Regulation; D005805:Genes, MHC Class I; D006657:Histones / Q000378:metabolism*; D007371:Interferon-gamma / Q000378:metabolism; D007668:Kidney / Q000166:cytology / Q000378:metabolism; D051379:Mice; D008810:Mice, Inbred C57BL; D008822:Mice, Transgenic; D009707:Nucleosomes / Q000378:metabolism*; D011401:Promoter Regions, Genetic; D013154:Spleen / Q000166:cytology / Q000378:metabolism; D014018:Tissue Distribution; D024363:Transcription Initiation Site; D014158:Transcription, Genetic; D019076:Transgenes
D002843:Chromatin; D006657:Histones; D009707:Nucleosomes; D007371:Interferon-gamma