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• W777788554 abstract "Abstract Introduction: Modulation of the DNA methylation landscape during cell differentiation is a well-established phenomenon. The B-cell lineage represents a paradigmatic cellular model to study the dynamic epigenome during cell development and specification because major B-cell maturation stages are well defined and display differential phenotypic and gene expression features. Furthermore, different B-cell subpopulations show different proliferation abilities, microenvironmental influences and life spans, providing a window of opportunity to study the epigenome in the context of multiple processes. Methods: We performed whole-genome bisulfite sequencing (WGBS), high-density methylation microarrays and gene expression profiling of ten purified human B-cell subpopulations spanning the entire differentiation program, ranging from uncommitted progenitors to terminally-differentiated plasma cells. Results: The results of both WGBS and methylation microarrays indicate that B-cell ontogenesis involves an extensive and gradual reconfiguration of the DNA methylome. We uncovered that non-CpG methylation at CpApC trinucleotides is present in progenitor cells and disappears upon B-cell commitment independently of CpG demethylation. CpG methylation, in contrast, changed extensively during the entire B-cell maturation program, with one quarter of all measured CpGs showing dynamic methylation. B-cell enhancers suffered more extensive methylation changes than promoter regions, especially in the early differentiation steps up to the germinal center B-cell (gcBC) stage, and their demethylation seemed to be mediated by binding of lineage-specific transcription factors. Enhancers with dynamic methylation were related to genes involved in a large B-cell network that showed high gene expression variability throughout differentiation. In highly proliferative gcBCs, we observed a shift of dynamic methylation from regulatory towards non-functional elements; gcBCs start to undergo global demethylation of late-replicating heterochromatic regions and methylation of polycomb-repressed regions. This signature becomes particularly extensive in long-lived memory B cells and plasma cells, indicating that these changes start in highly proliferative cells and then accumulate in non-proliferative cells with extended lifespan. Conclusion: Our epigenomic analysis of the B-cell differentiation program extends our knowledge on how the DNA methylome is modulated during cell specification and maturation and offers a resource for researchers in the field, both at global and single gene levels. Disclosures No relevant conflicts of interest to declare." @default.
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• W777788554 date "2014-12-06" @default.
• W777788554 modified "2023-10-06" @default.
• W777788554 title "Characterization of the DNA Methylome during Human B-Cell Differentiation" @default.
• W777788554 doi "https://doi.org/10.1182/blood.v124.21.4346.4346" @default.
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