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. 1992 Apr 25;20(8):1925–1932. doi: 10.1093/nar/20.8.1925

The involvement of demethylation in the myeloid-specific function of the mouse M lysozyme gene downstream enhancer.

S Klages 1, B Möllers 1, R Renkawitz 1
PMCID: PMC312308  PMID: 1579494

Abstract

Lysozyme gene expression is a specific marker for the macrophage/granulocyte lineage of hematopoietic differentiation in mammals, its expression being gradually increased during maturation. Analysis of the mechanisms regulating mouse M lysozyme gene expression during myeloid differentiation revealed a complicated pattern of DNase I hypersensitive sites (HS sites) within the flanking regions of the gene. The HS-3 site, located in the 3'-flanking region of the gene, overlapped with an enhancer element, which is the only strong enhancer identified in the vicinity of the gene. We demonstrate a positive correlation between undermethylation of the entire 3'-flanking region, the appearance of the HS-3 site, and M lysozyme gene expression during in vitro differentiation of hematopoietic stem cells. We furthermore show that methylation of a single CpG site within the enhancer core element, only observed in immature macrophage cells in vivo, is sufficient to inhibit nuclear factor binding to this element in vitro and to inhibit its transactivation potential in DNA transfection experiments.

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