The “neighborhood effect” in chromatin biology: TET proteins-mediated DNA demethylation reconfigures the “histone code” at CpG islands
DNA Methylation and HydroxymethylationHistone Modifications

The “neighborhood effect” in chromatin biology: TET proteins-mediated DNA demethylation reconfigures the “histone code” at CpG islands

A nucleosome is constituted by positively charged histone proteins and negatively charged DNA. Methylation as well as other covalent modifications on DNA and histones ( together also called epigenetic modifications or marks) play important roles in the regulation of chromatin structure and function. TET (Ten-Eleven Translocation) proteins were identified as …

Chromatin StructureHistone ModificationsTools & Technology

You can take a gene out of context, but can you take context out of a gene?

A gene’s precise chromatin context profoundly affects its regulation. For example, genes located near nucleosomes containing acetylated histones are generally actively transcribed. By contrast, genes located near nucleosomes containing histones methylated at specific lysine residues are usually transcriptionally repressed. But is the opposite also true? Do specific gene sequences affect …

Aging, Environment, & DiseaseChromatin StructureDNA Methylation and Hydroxymethylation

Does defective binding of 5-hmC by MeCP2 contribute to Rett syndrome?

DNA methylation is an epigenetic modification that plays an important role in gene expression. Aberrant changes of DNA methylation in the genome are associated with many epigenetic-related neurological disorders. However, the mechanism by which DNA methylation affects chromatin structure and gene expression is not completely understood. Methyl-CpG-binding protein 2, (MeCP2), …

Chromatin StructureDevelopmental Biology & Stem CellsHistone Modifications

Chromatin Density Matters

Histone methylation mediated by polycomb repressive complex 2 (PRC2) is involved in numerous biological processes, including cell differentiation, proliferation, and stem cell plasticity. Enhancer of Zeste homolog 2 (Ezh2), a subunit of PRC2, is a histone methyltransferase that specifically methylates histone H3 on lysine 27 (H3K27) and regulates polycomb gene …

Chromatin StructureDNA Methylation and HydroxymethylationHistone ModificationsTools & Technology

Prediction of polyadenylation site usage from epigenetic modifications

In this computational study, the authors explore several links between epigenetic factors (including DNA methylation, nucleosomal association, and histone modifications) and the usage of polyadenylation (poly(A)) sites in transcribed messages.