학술논문
MLL5 Orchestrates a Cancer Self-Renewal State by Repressing the Histone Variant H3.3 and Globally Reorganizing Chromatin.
Document Type
Article
Author
Gallo, Marco; Coutinho, Fiona J.; Vanner, Robert J.; Gayden, Tenzin; Mack, Stephen C.; Murison, Alex; Remke, Marc; Li, Ren; Takayama, Naoya; Desai, Kinjal; Lee, Lilian; Lan, Xiaoyang; Park, Nicole I.; Barsyte-Lovejoy, Dalia; Smil, David; Sturm, Dominik; Kushida, Michelle M.; Head, Renee; Cusimano, Michael D.; Bernstein, Mark
Source
Subject
*DNA condensation
*NUCLEOPROTEINS
*CHROMOSOMES
*CARCINOGENS
*INCURABLE diseases
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Language
ISSN
1535-6108
Abstract
Summary Mutations in the histone 3 variant H3.3 have been identified in one-third of pediatric glioblastomas (GBMs), but not in adult tumors. Here we show that H3.3 is a dynamic determinant of functional properties in adult GBM. H3.3 is repressed by mixed lineage leukemia 5 (MLL5) in self-renewing GBM cells. MLL5 is a global epigenetic repressor that orchestrates reorganization of chromatin structure by punctuating chromosomes with foci of compacted chromatin, favoring tumorigenic and self-renewing properties. Conversely, H3.3 antagonizes self-renewal and promotes differentiation. We exploited these epigenetic states to rationally identify two small molecules that effectively curb cancer stem cell properties in a preclinical model. Our work uncovers a role for MLL5 and H3.3 in maintaining self-renewal hierarchies in adult GBM. [ABSTRACT FROM AUTHOR]