EZH2 and BCL6 Cooperate to Assemble CBX8-BCOR Complex to Repress Bivalent Promoters, Mediate Germinal Center Formation and Lymphomagenesis

  • Wendy Béguelin
  • , Matt Teater
  • , Micah D Gearhart
  • , María Teresa Calvo Fernández
  • , Rebecca L. Goldstein
  • , Mariano G. Cárdenas
  • , Katerina Hatzi
  • , Monica Rosen
  • , Hao Shen
  • , Connie M. Corcoran
  • , Michelle Y. Hamline
  • , Randy D. Gascoyne
  • , Ross L. Levine
  • , Omar Abdel-Wahab
  • , Jonathan D. Licht
  • , Rita Shaknovich
  • , Olivier Elemento
  • , Vivian J Bardwell
  • , Ari M. Melnick

Research output: Contribution to journalArticlepeer-review

201 Scopus citations

Abstract

The EZH2 histone methyltransferase mediates the humoral immune response and drives lymphomagenesis through formation of bivalent chromatin domains at critical germinal center (GC) B cell promoters. Herein we show that the actions of EZH2 in driving GC formation and lymphoma precursor lesions require site-specific binding by the BCL6 transcriptional repressor and the presence of a non-canonical PRC1-BCOR-CBX8 complex. The chromodomain protein CBX8 is induced in GC B cells, binds to H3K27me3 at bivalent promoters, and is required for stable association of the complex and the resulting histone modifications. Moreover, oncogenic BCL6 and EZH2 cooperate to accelerate diffuse large B cell lymphoma (DLBCL) development and combinatorial targeting of these repressors results in enhanced anti-lymphoma activity in DLBCLs.

Original languageEnglish (US)
Pages (from-to)197-213
Number of pages17
JournalCancer Cell
Volume30
Issue number2
DOIs
StatePublished - Aug 8 2016

Bibliographical note

Publisher Copyright:
© 2016 Elsevier Inc.

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