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. 2002 Aug 1;21(15):4183–4195. doi: 10.1093/emboj/cdf401

Table I. Co-operation of human de novo and maintenance methyl transferases for DNA methylation.

DNA methyltransferase Methylation (nM CH3/h)
hDNMT1 15 ± 0.45
hDNMT3a 0.4 ± 0.04
hDNMT3b 1.25 ± 0.04
hDNMT3a + hDNMT3b 1.8 ± 0.03
hDNMT1 + hDNMT3a 18 ± 0.1
hDNMT1 + hDNMT3b 28 ± 0.8
hDNMT1 + hDNMT3a + hDNMT3b 26.1 ± 0.06

Each methylation reaction was performed twice in duplicate. Final methyl group incorporation was calculated after deduction of the background value.