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. 1986 Apr;6(4):1135–1140. doi: 10.1128/mcb.6.4.1135

Primary DNA sequence determines sites of maintenance and de novo methylation by mammalian DNA methyltransferases.

A H Bolden, C M Nalin, C A Ward, M S Poonian, A Weissbach
PMCID: PMC367624  PMID: 3023872

Abstract

Analysis of the enzymatic methylation of oligodeoxynucleotides containing multiple C-G groups showed that hemimethylated sites in duplex oligomers are not significantly methylated by human or murine DNA methyltransferase unless those sites are capable of being methylated de novo in the single- or double-stranded oligomers. Thus, the primary sequence of the target strand, rather than the methylation pattern of the complementary strand, determines maintenance methylation. This suggests that de novo and maintenance methylation are the same process catalyzed by the same enzyme. In addition, the study revealed that complementary strands of oligodeoxynucleotides are methylated at different rates and in different patterns. Both primary DNA sequence and the spacing between C-G groups seem important since in one case studied, maximal methylation required a specific spacing of 13 to 17 nucleotides between C-G pairs.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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