Table 2. CpG methylation profiling of 12 maternal and 3 paternal imprinting control regions.

	Gene locus	Chr.	Extents of the ICRs†		Average methylation levels
			Start	End	Wild-type oocyte	DnmtLl−/− oocyte	Sperm	Blastocyst	ESC
Maternally methylate imprinted genes	Nespas-Gnas	2	174,119,863	174,126,564	99.3%	5.6%	3.9%	38.2%	55.9%
	Gnas (exon1A)	2	174,150,877	174,154,638	95.2%	3.5%	4.1%	20.4%	7.8%
	Peg10	6	4,696,743	4,699,483	95.9%	6.7%	5.5%	31.8%	57.1%
	Mest	6	30,684,932	30,689,966	96.5%	2.3%	4.2%	30.7%	52.6%
	Peg3	7	6,679,787	6,684,257	98.1%	3.0%	2.5%	32.1%	42.8%
	Snrpn	7	67,147,381	67,151,583	94.1%	35.7%	4.6%	34.3%	64.9%
	Kcnq1ot1	7	150,480,736	150,482,810	97.9%	2.2%	4.3%	34.1%	52.0%
	Plagl1	10	12,809,697	12,812,131	99.9%	1.3%	7.4%	35.4%	53.0%
	Grb10	11	11,925,127	11,927,100	98.0%	1.2%	5.3%	38.5%	78.7%
	Zrsr1	11	22,871,610	22,874,212	94.1%	5.2%	6.8%	34.8%	47.0%
	Igf2r	17	12,934,169	12,935,816	99.1%	0.9%	3.8%	44.2%	53.2%
	Impact	18	13,130,435	13,133,510	97.2%	2.4%	6.6%	43.1%	38.6%
Paternally methylated imprinted genes	H19	7	149,764,673	149,771,930	13.5%	0.6%	96.5%	40.8%	65.5%
	Rasgrf1	9	89,767,090	89,775,128	7.4%	0.7%	92.0%	25.2%	59.4%
	Dlk1-Meg3	12	110,762,703	110,773,093	18.9%	0.9%	96.8%	32.4%	83.1%

†: : The extents of each region in germ cells were determined by bisulfite sequencing study [39].