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Research Papers
Department of Molecular Biology, Roswell Park Memorial Institute, Buffalo, New York 14263.
Abstract
We have examined the relative methylation levels of several dispersed repeated and low-copy-number gene sequences during gametogenesis and early embryogenesis. Southern blot analyses revealed that L1, intercisternal A particle (IAP), and major urinary protein (MUP) sequences were undermethylated extensively at MspI sites in DNA from diplotene oocytes. In contrast, the same sequences were highly methylated in DNA from pachytene spermatocytes, round spermatids, and epididymal sperm. These results indicate that there are genome-wide DNA methylation differences between oogenesis and spermatogenesis. Repeated sequences in DNA from cleavage-stage embryos and inner cell masses (ICM) were methylated at intermediate levels, consistent with transient maintenance of gametic methylation levels during early embryogenesis. Gametic differences in DNA methylation observed here indicate that methylation could provide a mechanism for imprinting maternal and paternal genomes resulting in differential regulation of parental genomes during early development.
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