Methylation and expression of the lactoferrin gene in human tissues and cancer cells

Biometals : an International Journal on the Role of Metal Ions in Biology, Biochemistry, and Medicine
Christina TengEric Liu

Abstract

The lactoferrin gene promoter contains GC-rich regions that harbor consensus sequences for a variety of transcription factors. Previous work in our laboratory has demonstrated a link between methylation at the CpG sites of the mouse lactoferrin gene promoter and the level of its expression. The current work investigates the methylation profile in three regions of the human lactoferrin gene by bisulfite genomic sequencing. In addition, the methylation profiles of normal leukocyte DNA, and leukemia cell line and patient DNA were compared. The three regions are located at the -504/-190, which includes the estrogen response element, the -282/+271 which contains the lactoferrin promoter and the +1087/+1476, a region within the first intron that has the alternative delta lactoferrin promoter. Differential methylations were found within all the regions. Increased methylation at the CpG sites and the presence of non-CpG methylation of the lactoferrin promoters were found in the cancer samples.

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