Histone methyltransferase (PubMed:29514099). Specifically methylates 'Lys-36' of histone H3, inducing di-methylation (PubMed:29514099). Plays a role in modulating lifespan and oxidative stress resistance, in a manner dependent upon daf-16/Forkhead box protein O and the Insulin/IGF-1-like signaling (IIS) mediated pathway (PubMed:29514099). Represses transcription of daf-16 isoform a, perhaps by methylating histone H3 at the daf-16 promoter, which in turn leads to recruitment of histone deacetylases and thus modulation of expression (PubMed:29514099). L-lysyl(36)-[histone H3] + 2 S-adenosyl-L-methionine = 2 H(+) + N(6),N(6)-dimethyl-L-lysyl(36)-[histone H3] + 2 S-adenosyl-L-homocysteine Expressed in pharyngeal and body wall muscles. Muscle-specific expression increases in adults between day 3 and day 11. RNAi-mediated knockdown causes lifespan extension. Belongs to the class V-like SAM-binding methyltransferase superfamily. Histone-lysine methyltransferase family.