This data supports previous findings linking exon-intron marking by histone modifications with co-transcriptional splicing, although our evidence would suggest that at least 13 histone modifications are involved in this process (at least two of which may act in specific combinations on expressed genes).
Indeed, whilst the age-associated hypomethylation of the Avp had no effect on mRNA expression levels, Hnf4a repression by histone modifications with age resulted in lower levels of expression.
Immune subversion by histone modification correlates with changes in host gene expression (Li et al. 2007).
Surprisingly, both enhancers and promoters, are associated with codes dominated by histone modifications associated with transcription elongation.
We also note that the regulatory effects of PRC2 can be modulated by histone modifications associated with active chromatin, such as H3K4me3 [ 31], raising the possibility that PRC2 effects might differ depending on levels of histone acetylation.
Within a given cell, only a fraction of the rDNA repeats are transcriptionally active and display a euchromatic chromatin structure characterized by histone modifications associated with transcriptional activity (i.e., H3K4me, H3K9ac) and low levels of CpG methylation.
We found that motif-based prediction was universally improved by the inclusion of any histone modification, with a substantial average gain of Δ0.055 area under ROC (AUC).
CSR-1/22G-RNA target genes are not generally downregulated, but are characterized by histone modifications that correlate with active chromatin, including H3K4me2,3 and H3K36me2,3 [ 60].
Therefore, cell type specific enhancer status defined by histone modifications was positively correlated with cell type specific regulation of nearby gene expression.
DNA accessibility can be affected by the structure of nucleosomes and their interaction with DNA by exchanging canonical histones with histone variants or by histone modifications, respectively.
