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Histone methylation is regulated by a variety of of events, including transcriptional activation and repression, relative location of the histone in the chromatin (pericentric or not, hetero- vs. euchromatin, etc.), X-inactivation, the cell's point in the cell cycle, and others. A variety of signaling pathways can lead to the (in)activation of HMTs. I found ...

I can get the ball rolling.. Found a nice paper which looks at this phenomenon in yeast. So as a primer, 8 histone proteins come together to make a spool of sorts which DNA wraps around: Histone proteins have many sequence variants, and each one of them can be covalently modified with methyl, acyl, phospho, SUMO, adp and many other sorts of chemical ...