Abstract
Variation in the degree of methylation of DNA seems to be one mode of regulating gene expression in eukaryotic cells1–7. The relationship between DNA demethylation and gene activation observed in globin4–6 and viral2 genes, together with evidence that alterations in the degree of DNA methylation of a gene are heritable8, although not with 100% fidelity9, have suggested that this may be a mechanism of control of differentiation. Futhermore, exposure to the demethylating drug 5-azacytidine (5-AC) causes differentiation of 3T3 cells into striated muscle cells, chondrocytes and adipocytes7. Subsequent studies have shown that these effects are due to DNA demethylation10. In view of these observations, we have now attempted to modify several continuous B-cell lines with 5-AC. Following exposure of the pre-B lymphoma ABLS 8.1 to 5-AC, we have derived cloned cell lines which possess macrophage-like characteristics not expressed by ABLS 8.1. Similar macrophage-like cell lines were obtained in two independent experiments; they have been re-cloned and remain stable after 4 months of continuous culture.
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Boyd, A., Schrader, J. Derivation of macrophage-like lines from the pre-B lymphoma ABLS 8.1 using 5-azacytidine. Nature 297, 691–693 (1982). https://doi.org/10.1038/297691a0
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DOI: https://doi.org/10.1038/297691a0
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