Histone H3 (1-21) K4(Me1)

This is a monomethylated lysine at position 4 of the 1-21 amino acid histone H3 peptide. This form of histone methylation is characterized as being enriched around transcription start sites. It’s chromatin mark was also closely correlated to cell-type specific expression of putative gene targets of enhancers. It was also noted from a genome wide study that most potential regulatory elements were enriched only by the mono-methylated version of this histone 3.