Involved in the positive regulation of histone H3-K9 dimethylation. Expression starts around 9.0 dpc in the neural folds, which give rise to neural crest cells. Neural crest cells develop into various tissues, including the sensory ganglia that contain nociceptor cell bodies. Prominently expressed in sensory spinal ganglia (dorsal root ganglia) but not in sympathetic ganglia during the time when sensory neurons emerge (10.5 dpc-13.5 dpc), mature and differentiate (14.5 dpc-postnatal day 14). Belongs to the class V-like SAM-binding methyltransferase superfamily.