TET1 catalytic activity is required for reprogrammign of imprinting control regions and the patterning of sperm-specific hypomethylated regions [Mouse Methylation285 12v1-0 BeadChip]

DNA methylation erasure is required for mammalian primordial germ cell reprogramming. TET enzymes iteratively oxidize 5-methylcytosine to generate 5-hyroxymethylcytosine (5hmC), 5-formylcytosine, and 5-carboxycytosine to facilitate active genome demethylation. Whether these bases are required to promote replication-coupled dilution or activate base excision repair during germline reprogramming remains unresolved due to the lack of genetic models that decouple TET1 activities. Here, we generated two mouse lines expressing catalytically inactive TET1 (Tet1-HxD) and TET1 that stalls at 5hmC (Tet1-V). This experiment was done to conduct genome wide DNA methylation profiling of catalytically inactive Tet1HxD/HxD sperm, 5hmC stalling Tet1V/V sperm, KO Tet1-/- sperm, and WT sperm. Sperm samples were collected from adult males (>10 week). Bisulfite converted DNA from 36 mouse sperm samples of 4 genotypes (Tet1-HxD = 8, Tet1-KO = 10, Tet1-V - 10, WT = 8) were hybridized to the Illumina Mouse Methylation285 12v1-0 BeadChip Array