DNA oxidation towards totipotency in mammalian development
【摘要】:正Mammalian development begins with a single cell(zygote) resulted from the fertilization of a sperm and an oocyte.The zygotic genome undergoes profound epigenetic reprogramming to prepare for embryo development. The biological significance and mechanisms of epigenetic reprogramming are not well understood.We find that oxidation occurs in the paternal genomic DNA in zygotes,changing 5-methylcytosine(5mC) into 5-hydroxymethylcytosine(5hmC).In Tet3 oxidase knockout zygotes,the conversion of 5mC into 5hmC fails