Touching base: Sophisticated mass spectrometry has shown that 5‐formylcytosine is a constituent of mammalian embryonic stem cell DNA. This base is likely produced from methylcytosine via hydroxymethylcytosine (see scheme), and it may serve as an intermediate in the long searched for pathway of active DNA demethylation.
Ein großer Schritt vorwärts: Durch aufwändige Massenspektrometrie wurde 5‐Formylcytosin in DNA von embryonalen Stammzellen der Maus identifiziert. Es entsteht vermutlich aus Methylcytosin über Hydroxymethylcytosin (siehe Schema) und könnte ein Intermediat des lange gesuchten Mechanismus der aktiven Demethylierung von DNA sein.
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