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Mol Cell Biol. 1986 November; 6(11): 4122-4125

Active X chromosome DNA is unmethylated at eight CCGG sites clustered in a guanine-plus-cytosine-rich island at the 5' end of the gene for phosphoglycerate kinase.

D H Keith, J Singer-Sam and A D Riggs

ABSTRACT

The 5' control region and first exon for human X-chromosome-linked phosphoglycerate kinase is contained in a G + C-rich island. We measured methylation at all HpaII sites in this 5' region of leukocyte DNA. By use of a blotting procedure that allows analysis of small DNA fragments, we found that the HpaII sites are entirely methylated when from an inactive X chromosome and entirely unmethylated when from an active one. In contrast, methylation of HpaII sites in more downstream regions of the gene is essentially the same in active and inactive X chromosomes.

Mol Cell Biol. 1986 November; 6(11): 4122-4125




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