|Epigenetics News: May 2016|
In The News
DNA methylation on N6-adenine in mammalian embryonic stem cells.
In this recent publication, researchers from Yale University identified a new DNA methylation mark in mammalian embryonic stem cells. To investigate this new mark, researchers applied a targeted ChIP-Seq method focusing on genomic regions enriched in the H2A.X marker. Results indicate that this new mark, N6-methyladenine, is localized at the 5'UTRs and ORFs of LINE-1 retroelements and that enrichment of N6-methyladenine is correlated with the epigenetic silencing and downregulation of neighbouring genes.
Dynamic Competing Histone H4 K5K8 Acetylation and Butyrylation Are Hallmarks of Highly Active Gene Promoters.
Histone lysine butyrylation is a conserved post-translational modification that is correlated with high gene expression. In the current issue of Molecular Cell, researchers investigate the role of butyrylation during mammalian spermatogenesis through a series of in vitro and genome wide analyses. Results indicate that despite acting as a direct stimulator of transcription, histone butyrylation competes with acetylation to prevent Brdt binding, especially at H4 K5. Furthermore, alternating H4 acetylation and butyrylation could impact the final male epigenome features.
TRIBE: Hijacking an RNA Editing Enzyme to Identify Cell-Specific Targets of RNA-Binding Protein.
A novel technology for studying which RNA molecules interact with specific RNA binding proteins (RBPs) is presented in this issue of Cell. Taking advantage of the catalytic domain of the RNA editing protein, ADAR, scientists have developed a method called TRIBE (targets of RNA-binding proteins identified by editing). This method is based on the construction of a fusion protein containing an RNA binding protein and the catalytic domain of ADAR. After transfection into cells, RBP targets are marked with novel RNA editing events and identified by RNA-sequencing.