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DNA methyltransferases, Dnmt3a and Dnmt3b, are required for de novo methylation in embryonic stem (ES) cells and postimplantation embryos. However, the mechanism of de novo methylation is largely unknown. In this study, we have analyzed the sequence specificity of Dnmt3a and Dnmt3b during de novo methylation of murine Maloney leukemia virus provirus DNA in virus-infected ES cells. Provirus DNA from...
It has been suggested that DNA methylation plays a crucial role in genomic imprinting and X inactivation. Using DNA methyltransferase 1 (Dnmt1)-deficient mouse embryos carrying X-linked lacZ transgenes, we studied the effects of genomic demethylation on X inactivation. Based on the expression pattern of lacZ, the imprinted X inactivation in the visceral endoderm, a derivative of the extraembryonic...
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