XB-ART-8151
Biochim Biophys Acta
2001 Oct 31;15211-3:39-44. doi: 10.1016/s0167-4781(01)00280-9.
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Constitutive genomic methylation during embryonic development of Xenopus.
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Methylation of CpG dinucleotides is a predominant modification of genomic DNA in many species, especially in vertebrates. This modification, generally associated with transcriptional repression, is rapidly and globally lost during mammalian pre-implantation development. This loss of methylation is gradually reversed during subsequent stages of development. Here we show that the amphibian Xenopus laevis maintains high levels of DNA methylation during early embryonic development. The methylation status of specific loci is independent of the temporal expression profile. The observations have profound implications for the regulation of early embryonic gene regulation and genome function.
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