Study of the methylation of RCGY sites in the regulatory region of the FAM19A4 gene in human cell line dna preparations by GLAD-PCR assay
The method of GLAD-PCR analysis was used to determine the methylation of RCGY sites in the regulatory region of the FAM19A4 gene (Xp3: 68932451 - 68932800) in the DNA preparations of the malignant human cell lines Raji, Jurkat, HeLa, U-937 and the control DNA of the lung fibroblast cell line L68. It is shown that the octanucleotide GCGCGCGC (Xp3: 68932500), located in the first exon of the FAM19A4 gene, is cleaved approximately equally in the DNA of all 4 malignant human cell lines, whereas in the DNA of L68 this site is hydrolyzed 10-15 times weaker. These results are consistent with data of epigenomic sequencing of L68, Raji, and U-937 DNA. Methylation of CG-dinucleotides at positions 68932727 and/or 68932740 in the promoter of the FAM19A4 gene occurs only in tumor DNA and is not observed in L68 DNA, whereas methylation of CG-dinucleotide at position 68932704 is observed only in HeLa DNA.