title: Expression of polycomb targets predicts breast cancer prognosis.
abstract: Global changes in the epigenome are increasingly being appreciated as key events in cancer progression. The pathogenic role of enhancer of zeste homolog 2 (EZH2) has been connected to its histone 3 lysine 27 (H3K27) methyltransferase activity and gene repression; however, little is known about relationship of changes in expression of EZH2 target genes to cancer characteristics and patient prognosis. Here we show that through expression analysis of genomic regions with H3K27 trimethylation (H3K27me3) and EZH2 binding, breast cancer patients can be stratified into good and poor prognostic groups independent of known cancer gene signatures. The EZH2-bound regions were downregulated in tumors characterized by aggressive behavior, high expression of cell cycle genes, and low expression of developmental and cell adhesion genes. Depletion of EZH2 in breast cancer cells significantly increased expression of the top altered genes, decreased proliferation, and improved cell adhesion, indicating a critical role played by EZH2 in determining the cancer phenotype.
authors.affiliation: Research Unit on Biomedical Informatics, Department of Experimental and Health Sciences, Universitat Pompeu Fabra, Barcelona, Spain.
authors.forename: Alba
authors.initials: A
authors.lastname: Jene-Sanz
authors.forename: Renáta
authors.initials: R
authors.lastname: Váraljai
authors.forename: Alexandra V
authors.initials: AV
authors.lastname: Vilkova
authors.forename: Galina F
authors.initials: GF
authors.lastname: Khramtsova
authors.forename: Andrey I
authors.initials: AI
authors.lastname: Khramtsov
authors.forename: Olufunmilayo I
authors.initials: OI
authors.lastname: Olopade
authors.forename: Nuria
authors.initials: N
authors.lastname: Lopez-Bigas
authors.forename: Elizaveta V
authors.initials: EV
authors.lastname: Benevolenskaya
mesh_terms: D001943:Breast Neoplasms / Q000235:genetics* / Q000378:metabolism / Q000473:pathology; D002448:Cell Adhesion / Q000235:genetics; D002460:Cell Line; D045744:Cell Line, Tumor; D049109:Cell Proliferation; D000071221:Enhancer of Zeste Homolog 2 Protein; D058750:Epithelial-Mesenchymal Transition / Q000235:genetics; D005260:Female; D020869:Gene Expression Profiling; D015972:Gene Expression Regulation, Neoplastic; D057809:HEK293 Cells; D006657:Histones / Q000378:metabolism; D006801:Humans; D015151:Immunoblotting; D053208:Kaplan-Meier Estimate; D061986:MCF-7 Cells; D008745:Methylation; D008957:Models, Genetic; D063151:Polycomb Repressive Complex 2 / Q000235:genetics* / Q000378:metabolism; D011379:Prognosis; D034622:RNA Interference; D020133:Reverse Transcriptase Polymerase Chain Reaction
chemical_list: D006657:Histones; C498409:EZH2 protein, human; D000071221:Enhancer of Zeste Homolog 2 Protein; D063151:Polycomb Repressive Complex 2
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