RT Journal Article SR Electronic T1 Chromatin, DNA methylation and neuron gene regulation — the purpose of the package JF Journal of Psychiatry and Neuroscience JO JPN FD Canadian Medical Association SP 257 OP 263 VO 30 IS 4 A1 Rajiv P. Sharma A1 Dennis R. Grayson A1 Alessandro Guidotti A1 Erminio Costa YR 2005 UL http://jpn.ca/content/30/4/257.abstract AB The accessibility of cognate binding sites within a gene promoter can be modified by the condensation or relaxation of local chromatin structure. Local chromatin structure is in turn programmed by covalent modifications of cytosine bases in DNA and amino acid residues in histone protein tails. These chemical and physical adaptations around gene promoters can significantly change levels of mRNA expression. Furthermore, linear patterns of covalent modification of histone protein tails are emerging as a distinct regulatory code — another form of cellular memory. Because chromatin structure can be modified by conventional pharmacologic therapy, a novel approach to the regulation of neuronal gene expression in clinical populations is possible.