lncRNA Epigenetic Landscape Analysis Identifies EPIC1 as an Oncogenic lncRNA that Interacts with MYC and Promotes Cell-Cycle Progression in Cancer.

Wang Z, Yang B, Zhang M, Guo W, Wu Z, Wang Y, Jia L, Li S, Cancer Genome Atlas Research Network, Xie W, Yang D
Cancer Cell. 2018 33 (4): 706-720.e9

PMID: 29622465 · PMCID: PMC6143179 · DOI:10.1016/j.ccell.2018.03.006

We characterized the epigenetic landscape of genes encoding long noncoding RNAs (lncRNAs) across 6,475 tumors and 455 cancer cell lines. In stark contrast to the CpG island hypermethylation phenotype in cancer, we observed a recurrent hypomethylation of 1,006 lncRNA genes in cancer, including EPIC1 (epigenetically-induced lncRNA1). Overexpression of EPIC1 is associated with poor prognosis in luminal B breast cancer patients and enhances tumor growth in vitro and in vivo. Mechanistically, EPIC1 promotes cell-cycle progression by interacting with MYC through EPIC1's 129-283 nt region. EPIC1 knockdown reduces the occupancy of MYC to its target genes (e.g., CDKN1A, CCNA2, CDC20, and CDC45). MYC depletion abolishes EPIC1's regulation of MYC target and luminal breast cancer tumorigenesis in vitro and in vivo.

Copyright © 2018 Elsevier Inc. All rights reserved.

MeSH Terms (18)

Animals Binding Sites Breast Neoplasms Cell Cycle Cell Line, Tumor CpG Islands DNA Methylation Epigenesis, Genetic Female Gene Expression Regulation, Neoplastic Humans Mice Neoplasm Transplantation Prognosis Promoter Regions, Genetic Proto-Oncogene Proteins c-myc RNA, Long Noncoding Up-Regulation

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