An epigenetic switch ensures transposon repression upon dynamic loss of DNA methylation in embryonic stem cells
DNA methylation is extensively remodeled during mammalian gametogenesis and embryogenesis.Most transposons become hypomethylated, raising the question of their regulation in the absence of DNA methylation.To reproduce a rapid and extensive demethylation, we subjected mouse ES cells to chemically defined hypomethylating culture conditions.Surprising