SET1: The SET1 gene in the budding yeast Saccharomyces cerevisiae was discovered by several laboratories as encoding the first known H3K4 methyltransferase, a catalytic function performed through its conserved SET domain. Yeast Set1, like its orthologs in higher eukaryotes (SET1A/B in humans), is recruited to chromatin by the serine 5-phosphorylated C-terminal domain of RNA polymerase II (pol II). This interaction with the initiating form of pol II results in the occupancy of Set1 near the 5’-end of active genes, which correlates closely with the peak of H3K4me3. (1)

    In metazoans, SET1A/B proteins seem to function analogously to yeast Set1 in performing the majority of transcription-coupled H3K4 methylation found at active genes, presumably through co-transcriptional recruitment. Unlike their yeast counterpart, human SET1A/B proteins are also recruited to chromatin via an interaction with non-methylated CpG island sequences, mediated by the SET1A/B-associated protein CFP1.

Reference
1. Ernst P, Vakoc CR.WRAD: enabler of the SET1-family of H3K4 methyltransferases. Brief Funct Genomics.2012;11(3):217-226. PMID: 22652693.