ArticleGenes, chromosomes & cancer2025
Comparative DNA Methylation Profiling of Human and Murine ALK-Positive B-Cell Neoplasms.
Article in Genes, chromosomes & cancer, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Structural genomic variants leading to anaplastic lymphoma kinase (ALK) gene fusions and aberrant expression of the ALK tyrosine kinase are the hallmark of subtypes of T- and B-lineage neoplasms, namely ALK-positive anaplastic large lymphoma (ALCL) and ALK-positive large B-cell lymphoma (LBCL). The latter is a rare aggressive lymphoma, which has been initially identified as a variant of diffuse LBCL (DLBCL) with plasmablastic features. Here, we performed comparative DNA methylation profiling of human and murine ALK-positive B-cell neoplasms. Array-based DNA methylation data from ALK-positive LBCL samples of eight patients were compared to that of DLBCL (n = 75), multiple myeloma (MM, n = 24), ALK-positive ALCL (n = 12) and normal B-cell populations (n = 93). ALK-positive LBCLs share a distinct DNA methylation signature similar to that of MM, characterized by lower global DNA methylation levels compared to DLBCLs and normal B-cell populations. DNA methylation alterations in ALK-positive LBCL were predominantly located in heterochromatic and polycomb-repressed regions. The epigenetic age and relative proliferative history of ALK-positive LBCL were intermediate between MM and DLBCL. B-cell neoplasms in NPM::ALK transgenic mice showed a similar hypomethylated signature when compared to normal murine B cells. Cross-species comparison indicated conservation of chromatin states and pathways affected by hypomethylation. Together, the findings suggest that in line with their phenotypical appearance human and murine ALK-positive B-cell lymphomas share an epigenetic profile more closely resembling that of plasma cell neoplasias than that of DLBCLs.
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