Chromatin regulator required for brain development: acts as a regulator of RNA elongation rate, thereby regulating neural stem cell (NSC) proliferation and synaptic transmission. May act by mediating trimethylation of 'Lys-36' of histone H3 (H3K36me3), which is essential to allow on-time RNA elongation dynamics. Also monomethylates 'Lys-9' of histone H3 (H3K9me1) in vitro. The relevance of histone methyltransferase activity is however subject to discussion. L-lysyl(9)-[histone H3] + S-adenosyl-L-methionine = H(+) + N(6)-methyl-L-lysyl(9)-[histone H3] + S-adenosyl-L-homocysteine L-lysyl(36)-[histone H3] + 3 S-adenosyl-L-methionine = 3 H(+) + N(6),N(6),N(6)-trimethyl-L-lysyl(36)-[histone H3] + 3 S-adenosyl-L-homocysteine Interacts with components of the PAF1 complex (PAF1C) such as LEO1, CTR9 and CDC73. Interacts with NCOR1. Interacts with HDAC3. Localizes to active transcribed genes. The disease is caused by variants affecting the gene represented in this entry. Truncated N-terminus. Truncated N-terminus. Truncated N-terminus. Truncated N-terminus. Extended N-terminus.