Abstract:
:Charting differences between tumors and normal tissue is a mainstay of cancer research. However, clonal tumor expansion from complex normal tissue architectures potentially obscures cancer-specific events, including divergent epigenetic patterns. Using whole-genome bisulfite sequencing of normal B cell subsets, we observed broad epigenetic programming of selective transcription factor binding sites coincident with the degree of B cell maturation. By comparing normal B cells to malignant B cells from 268 patients with chronic lymphocytic leukemia (CLL), we showed that tumors derive largely from a continuum of maturation states reflected in normal developmental stages. Epigenetic maturation in CLL was associated with an indolent gene expression pattern and increasingly favorable clinical outcomes. We further uncovered that most previously reported tumor-specific methylation events are normally present in non-malignant B cells. Instead, we identified a potential pathogenic role for transcription factor dysregulation in CLL, where excess programming by EGR and NFAT with reduced EBF and AP-1 programming imbalances the normal B cell epigenetic program.
journal_name
Nat Genetjournal_title
Nature geneticsauthors
Oakes CC,Seifert M,Assenov Y,Gu L,Przekopowitz M,Ruppert AS,Wang Q,Imbusch CD,Serva A,Koser SD,Brocks D,Lipka DB,Bogatyrova O,Weichenhan D,Brors B,Rassenti L,Kipps TJ,Mertens D,Zapatka M,Lichter P,Döhner H,Küppedoi
10.1038/ng.3488subject
Has Abstractpub_date
2016-03-01 00:00:00pages
253-64issue
3eissn
1061-4036issn
1546-1718pii
ng.3488journal_volume
48pub_type
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