Titlebook: DNA Methylation; Molecular Biology an Jean-Pierre Jost,Hans-Peter Saluz Book 1993 Birkh?user Verlag 1993 DNA.Promoter.biology.gene expressi

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Kapitel XII Partizipatives Bauenlation is primarily a means of the control of gene expression. Many chapters of this book are devoted to various aspects of this function. In prokaryotes, DNA methylation affects such diverse phenomena as determination of accessibility of DNA to digestion by endonucleases, control of initiation of D

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Kapitel XII Partizipatives Bauenytosine residue (Bestor et al., 1984). The unmethylated fraction of the genome is exposed to diffusible factors in nuclei (Antequera et al., 1989), perhaps due to the action of proteins which bind to methylated sequences and induce their condensation (Meehan et al., 1989). Methylation may therefore

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R. M. M. Crawford,C. E. JeffreeM is 5-methylcytosine). Plants have a higher proportion of DNA cytosines methylated largely because they have additional methylcytosine in the trinucleotide sequence MNG (Belanger and Hepburn, 1990). Not all CG (nor CNG) sequences are methylated and yet those that are, are maintained in the methylat

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Dieter Hanelt,C. Wiencke,K. Bischoflcytosine (5-mC) residues per diploid nucleus. All 5-mC is present in the dinucleotide CpG, although only 70 to 80% of the potentially methylatable sites are actually in a methylated form. Most studies on the relative distribution of methylated cytosines in DNA have relied on the ability of some res

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Advances in Arctic Atmospheric Researchalgae are common in fresh water collected throughout the world (Van Etten et al., 1985; Schuster et al., 1986; Zhang et al., 1988; Reisser et al., 1988; Yamada et al., 1991). The hosts for these lytic chlorella viruses are exsymbiotic . strains NC64A and Pbi, originally isolated from the protozoan .

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Arctic Hydrology, Permafrost and Ecosystemsof DNA methylation. These patterns are represented by the probably unique distribution of the modified nucleotide 5-methyl-deoxycytidine (5-mC) in many different sequences of mammalian DNA. Most likely, 5-mC is the only modified nucleotide in mammalian DNA, at least the one present in measurable qua

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Arctic Hydrology, Permafrost and Ecosystemsparent roles for the methylation of DNA in eukaryotic cells, the exceptions being . yeast. The absence of DNA methylation in the latter two examples suggests that the fundamental mechanisms of DNA metabolism can exist without modification of cytosine. Probably the most common phenomenon ascribed in