Table 1.

Summary of arabidopsis genome DNA methyltransferase [187]

Family Mammalian and Arabidopsis	Arabidopsis genes	Function	Primary effects on DNA methylation	Effect on H3K9Me
DNMT1; MET Dnmt2 Dnmt4, DRMs Not known in mammals; Chromomethylase	MET1 METIIa METIIb METIII At5g25480 DRM1 and DRM2 CMT1 CMT2 CMT3	Maintenance of CG methylation ? ? ? ? De novo CG and non-CG Methylation and RdDM ? ? Locus-specific maintenance of non-CG methylation	Loss of CG methylation ? ? ? ? Loss of non-CG methylation at specific loci such as FWA and SUPERMAN ? ? Loss of CNG methylation pericentromeric repeats and at specific loci	Loss of H3K9Me ? ? ? ? No effect ? ? No effect