show Abstracthide AbstractDNA 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). E17.5 WT prospermatogonia were collected using FACS of Oct4-GFP cells and CUT&RUN for H3K4me3 and IgG were done on 130,000 cells. Overall design: 130,000 freshly sorted E17.5 Oct-GFP+ prospermatogonia cells were used for H3K4me and IgG CUT&RUN