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The demethylating drug 5-aza-2'-deoxycytidine (5-aza-2dC) is frequently used to investigate the effect of global DNA demethylation on gene expression in cultured mammalian cells. Here, we describe a method that uses the reactivation of an X-inactivated green fluorescent protein (GFP) transgene as a marker to enrich for cells that have undergone drug-induced demethylation. By combining it with microarray gene expression profiling, we demonstrate the method's utility in identifying genes activated by global DNA demethylation.

Improved DNA methylation analysis via enrichment of demethylated cells expressing an X-inactivated transgene