非表示:
キーワード:
Acetylation
Animals
Cell Line
Chromatin Immunoprecipitation/methods
DNA/metabolism
E1A-Associated p300 Protein/*metabolism
Gene Expression Regulation, Developmental
Heart/*embryology
Histones/*metabolism
Methylation
Mice
Myocytes, Cardiac/metabolism
Promoter Regions, Genetic
Protein Processing, Post-Translational
RNA, Messenger/biosynthesis
Serum Response Factor/*metabolism
Transcription, Genetic
Transcriptional Activation
要旨:
The adaptation of the cellular network to functional changes, timing and patterning of gene expression is regulated by binding of transcription factors to gene regulatory elements, which in turn depends on co-occurring histone modifications. These two layers influence each other, enabling a further level of regulatory fine-tuning. We analyzed the interdependencies between histone 3 acetylation, histone 3 lysine 4 dimethylation, the transcription factor Srf and the histone acetyltransferase p300 in an in vivo model using chromatin immunoprecipitation in a time-series during cardiac maturation in mouse. We found a strong correlation between the presence of the two histone modifications and binding of Srf and p300. Using linear modeling techniques we could show that each factor contributes individually as well as conjointly to histone 3 acetylation and gene expression, probably aided by accompanying histone 3 lysine 4 dimethylation. We further demonstrate that changes in gene expression during cardiac maturation are attended by changes of the analyzed regulators while revealing a high variability of combinatorial regulation. Finally, we propose a model of Srf-driven gene expression in cardiomyocytes.
