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Arribas, Alberto J.; Rinaldi, Andrea; Chiodin, Giorgia; Kwee, Ivo; Mensah, Afua Adjeiwaa; Cascione, Luciano; Rossi, Davide; Kanduri, Meena; Rosenquist, Richard; Zucca, Emanuele; Johnson, Peter W.; Gaidano, Gianluca; Oakes, Christopher C.; Bertoni, Francesco; Forconi, Francesco
Blood advances, 02/2019, Letnik: 3, Številka: 3Journal Article
Classic hairy cell leukemia (HCL) is a tumor of mature clonal B cells with unique genetic, morphologic, and phenotypic features. DNA methylation profiling has provided a new tier of investigation to gain insight into the origin and behavior of B-cell malignancies; however, the methylation profile of HCL has not been specifically investigated. DNA methylation profiling was analyzed with the Infinium HumanMethylation27 array in 41 mature B-cell tumors, including 11 HCL, 7 splenic marginal zone lymphomas (SMZLs), and chronic lymphocytic leukemia with an unmutated (n = 7) or mutated (n = 6) immunoglobulin gene heavy chain variable (IGHV) region or using IGHV3-21 (n = 10). Methylation profiles of nontumor B-cell subsets and gene expression profiling data were obtained from public databases. HCL had a methylation signature distinct from each B-cell tumor entity, including the closest entity, SMZL. Comparison with normal B-cell subsets revealed the strongest similarity with postgerminal center (GC) B cells and a clear separation from pre-GC and GC cellular programs. Comparison of the integrated analysis with post-GC B cells revealed significant hypomethylation and overexpression of BCR–TLR–NF-κB and BRAF-MAPK signaling pathways and cell adhesion, as well as hypermethylation and underexpression of cell-differentiation markers and methylated genes in cancer, suggesting regulation of the transformed hairy cells through specific components of the B-cell receptor and the BRAF signaling pathways. Our data identify a specific methylation profile of HCL, which may help to distinguish it from other mature B-cell tumors. Hairy cell leukemia (HCL) is a tumor of mature B cells. The role of DNA methylation in this leukemia is explored by Forconi and colleagues to identify a methylation-driven signature of this HCL to better characterize this disease and aid future drug development efforts. Display omitted
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in: SICRIS
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