Abstract
PRAME is a tumor-associated antigen, which belongs to the family of cancer–testis antigens (CTA). The expression of CTA is mainly restricted to the testis and various tumors. In contrast to other CTA, PRAME expression is also frequently detected in acute and chronic leukemias. Due to this expression pattern, PRAME has attracted great interest as a prognostic tumor marker that can be used for the detection of minimal residual disease and as a potential target for immunotherapy. In acute myeloid leukemia (AML), PRAME expression has been observed in 30–64% of cases. To evaluate whether epigenetic mechanisms contribute to PRAME activation in AML, we studied DNA methylation of 15 CpG dinucleotides within a CpG-rich region located in the intron 1 of the PRAME gene. DNA methylation was determined by sequence analysis of cloned PCR products generated from bisulfite-treated genomic DNA. Methylation patterns were correlated with PRAME mRNA levels as determined by microarray analysis and real-time PCR. We found almost complete methylation in mononuclear blood cells from two healthy donors and in bone marrow cells of four PRAME-negative AML patients. In contrast, the degree of PRAME methylation was clearly reduced in four PRAME-positive AML bone marrow samples. In particular, these samples were characterized by the presence of clones, which were completely devoid of methylation. The significant inverse correlation between the degree of methylation and PRAME expression suggests a causal role of DNA methylation in PRAME regulation. Such a role is further supported by the observation that treatment of PRAME-negative cell lines U-937 and THP-1 with the demethylating agent 5′-Aza-2′dC resulted in a dose-related upregulation of PRAME expression.
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Ortmann, C.A., Eisele, L., Nückel, H. et al. Aberrant hypomethylation of the cancer–testis antigen PRAME correlates with PRAME expression in acute myeloid leukemia. Ann Hematol 87, 809–818 (2008). https://doi.org/10.1007/s00277-008-0514-8
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DOI: https://doi.org/10.1007/s00277-008-0514-8