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. 1991 Jul 1;88(13):5759–5763. doi: 10.1073/pnas.88.13.5759

DNA methylation profiles in the human genes for tumor necrosis factors alpha and beta in subpopulations of leukocytes and in leukemias.

S Kochanek 1, A Radbruch 1, H Tesch 1, D Renz 1, W Doerfler 1
PMCID: PMC51957  PMID: 2062856

Abstract

The genomic sequencing technique has been applied to assess the state of methylation in the DNA from human leukocyte subpopulations from healthy individuals and in the DNA from several individuals with myeloid or lymphatic leukemias or non-Hodgkin lymphomas. Leukocyte populations were purified by the high-gradient magnetic cell sorting technique. In the human tumor necrosis factor alpha (TNF-alpha) gene segment between nucleotides 300 and 1150, the specific methylation profile in the DNA from human granulocytes and monocytes is maintained in three cases of myeloid leukemia. In one such case, all 5-methyl-2'-deoxycytidine residues have been replaced by cytidine. In a chronic lymphatic T-cell leukemia, all 5-methyl-2'-deoxycytidine residues have been substituted by cytidine. In normal B lymphocytes, in two cases of chronic lymphatic B-cell leukemias and two cases of non-Hodgkin lymphomas, all 5'-CG-3' sequences in this gene segment are devoid of methylation. In the TNF-beta gene, DNA methylation is decreased in several examples of acute or chronic myeloid leukemias in comparison to normal human granulocytes or monocytes, whose DNA is almost completely methylated between nucleotides 700 and 900. In human T and B lymphocytes, the main producers of TNF-beta, in three instances of chronic lymphatic leukemias and two cases of non-Hodgkin lymphomas, all 5'-CG-3' sequences are unmethylated in this region. The DNA from the human HeLa cell line is highly methylated at all 5'-CG-3' sequences in the TNF-alpha and -beta genes. The TNF-alpha gene is transcribed in the cells of one case of acute myeloid leukemia in which the analyzed region of the TNF-alpha gene is completely unmethylated. The TNF-beta gene is not transcribed in any of the malignant cells tested.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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