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. 1982 Jan;79(1):61–65. doi: 10.1073/pnas.79.1.61

Clonal inheritance of the pattern of DNA methylation in mouse cells.

R Stein, Y Gruenbaum, Y Pollack, A Razin, H Cedar
PMCID: PMC345661  PMID: 6459581

Abstract

DNA-mediated gene transfer was used to investigate the mode of inheritance of 5-methylcytosine in mouse L cells. Unmethylated phi X174 replicative form DNA remains unmethylated after its introduction and integration into these cells. On the other hand, phi X174 replicative form DNA that was methylated in vitro at its C-C-G-G residues retains these methylations as shown by restriction enzyme analysis with Hpa II and Msp I to detect methylation at this specific site. Although these unselected methylated vectors are prone to lose 30-40% of their methyl moieties upon transfection, this demethylation appears to be random. Once established, the resulting methylation pattern is stable for at least 100 cell generations. In order to examine the specificity of methylation inheritance, fully hemimethylated duplex phi X174 DNA was synthesized in vitro from primed single-strand phi X174 DNA by using 5-methyl deoxycytidine 5'-triphosphate. This molecule was inserted into mouse L cells by cotransformation and subsequently was analyzed by a series of restriction enzymes. Only methylations located at C-G residues were conserved after many generations of cell growth. The results suggest that the inheritance of the cellular DNA methylation pattern is based on a C-G-specific methylase that operates on newly replicated hemimethylated DNA.

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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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