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The role of DNA demethylation during development

The somatic genomic methylation pattern which plays a role in the suppression of basal gene activity is established anew in each generation through developmentally regulated de novo and demethylation steps. Demethylation appears to be carried out by a nucleotide exchange reaction which may involve RNA molecules, and is directed to specific loci in the genome through interactions between cis acting elements and trans acting factors.