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. 1991 Jan 11;19(1):77–83. doi: 10.1093/nar/19.1.77

DNA methylation as a regulatory mechanism in rat gamma-crystallin gene expression.

R Peek 1, R W Niessen 1, J G Schoenmakers 1, N H Lubsen 1
PMCID: PMC333536  PMID: 2011513

Abstract

We have investigated the methylation state of the rat gamma-crystallin genes in DNA from lens cells at different developmental stages as well as from kidney and heart cells. A clear correlation between the extent of demethylation of the promoter and 5' gene regions and the expression of these genes was observed. No change in the methylation state of the far upstream or 3' regions of the genes was seen. The demethylation of the promoter region was shown to occur during the differentiation from the lens epithelial to the lens fiber cell. The effect of cytosine methylation on gamma-crystallin promoter activity was tested by measuring gamma-crystallin promoter/chloramphenicol acetyltransferase fusion gene expression after in vitro primed repair synthesis of the promoter region in the presence of either dCTP or 5mdCTP. The hemimethylated promoter was no longer capable of promoting high CAT activity after introduction into lens-like cells. Taken together, our data suggest that DNA demethylation may be the determining step in the developmental stage-specific expression of the rat gamma-crystallin genes.

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