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The Dnmt3b gene encodes a de novo DNA methyltransferase that is essential for normal mouse development. It is highly expressed in early embryos and embryonic stem (ES) cells but downregulated in most adult somatic tissues. To gain insight into the regulation of Dnmt3b, we have isolated a mouse genomic bacterial artificial chromosome clone that contains the Dnmt3b gene. Complete sequence analysis of...
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...
DNA methylation plays an important role in animal development and gene regulation. In mammals, several genes encoding DNA cytosine methyltransferases have been identified. DNMT1 is constitutively expressed and is required for the maintenance of global methylation after DNA replication. In contrast, the murine Dnmt3 family genes appear to be developmentally regulated and behave like de novo DNA methyltransferases...
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