Prevents DNA hypermethylation and transcriptional silencing of transgenes and of some endogenous genes (PubMed:25002145, PubMed:24920332). May act as a molecular chaperone of IDM1, regulating its H3K18 acetylation activity (PubMed:25002145, PubMed:24920332). Homodimer or oligomer (PubMed:24920332). May form an 16-mer complex (PubMed:24920332). Interacts with MBD7 (via C-terminus) (PubMed:25684209, PubMed:25593350). Interacts with IDM1 (via N-terminus) (PubMed:25002145, PubMed:24920332, PubMed:25684209). Interacts with IMD3 (PubMed:25684209). Part of a complex made of MBD7, IDM1, IDM2, IDM3 and ROS1 (PubMed:24920332, PubMed:25684209). Colocalizes with IDM1 within nucleoplasmic and nucleolar foci. Expressed in cotyledons and hypocotyls in young seedlings. Not regulated by heat. No visible growth or developmental defects under normal growth conditions (PubMed:24920332). DNA hypermethylation (PubMed:25002145). Belongs to the small heat shock protein (HSP20) family. Truncated N-terminus. Truncated N-terminus.