Our findings confound existing views and point to active cellular mechanisms which dynamically regulate histone modification levels and account for exon-intron marking.
Thus, we attributed our results as indicative of a complex bona fide marking system of exon-intron structures defined by histone modification levels and not by nucleosome distributions, as reported previously [19], [20], [21], [22], [23].
Studies have shown the strong association between histone modification levels and gene expression levels.
Is there an association between specific histone modification levels and gene sizes, or gene expression levels?
Objective: This study was conducted in a Chinese population to determine whether occupational exposure to Ni is associated with alterations of global histone modification levels and to evaluate the inter- and intraindividual variance of global histone modification levels.
Comparing sLAD genes and non-sLAD genes has revealed distinct histone modification levels and NL association that correlate with gene expression states.
Intuitively, this corrects for differences in the dynamic range of changes to histone modification levels and for differences in segment size.
Conclusion: The results of this study indicate that occupational exposure to Ni is associated with alterations of global histone modification levels and that measurements of global levels of histone modifications are relatively stable over time in human PBMCs.
Third, in different human cell types, histone modification levels and gene expression are very well correlated, and the main peaks of enrichment for those important modifications are within the ORFs (e.g., H3K4me3, H3K79me1, H4K20me1, and H3K27ac) [ 42].
