High-coverage whole-genome analysis of 1220 cancers reveals hundreds of genes deregulated by rearrangement-mediated cis-regulatory alterations

0301 basic medicine Cancer Research Medizin General Physics and Astronomy Regulatory Sequences, Nucleic Acid Genome, Cancer Ecology,Evolution & Ethology Neoplasms Databases, Genetic Cancer genomics 2.1 Biological and endogenous factors 3100 Physics and Astronomy Genes, Tumor Suppressor Aetiology Càncer Cancer 0303 health sciences Human Biology & Physiology Q 3rd-DAS 1600 Chemistry 3. Good health Gene Expression Regulation, Neoplastic Enhancer Elements, Genetic PCAWG Structural Variation Working Group Genetics & Genomics Tumor Suppressor Biotechnology PCAWG Transcriptome Working Group 1300 Biochemistry Enhancer Elements Science General Biochemistry,Genetics and Molecular Biology Radboudumc 17: Women's cancers RIHS: Radboud Institute for Health Sciences 610 Genetics and Molecular Biology QH426 Genetics Article RC0254 Databases 03 medical and health sciences Rare Diseases SDG 3 - Good Health and Well-being Genetic Genetics Humans QH426 Computational & Systems Biology Neoplastic Nucleic Acid Whole Genome Sequencing RC0254 Neoplasms. Tumors. Oncology (including Cancer) Human Genome PCAWG Consortium General Chemistry Oncogenes DNA Methylation Tumour Biology Radboudumc 17: Women's cancers RIMLS: Radboud Institute for Molecular Life Sciences Genòmica Gene Expression Regulation Genes General Biochemistry Genomic Structural Variation Gene expression Digestive Diseases Regulatory Sequences Genètica
DOI: 10.1038/s41467-019-13885-w Publication Date: 2020-02-05T19:03:29Z
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ABSTRACT
AbstractThe impact of somatic structural variants (SVs) on gene expression in cancer is largely unknown. Here, as part of the ICGC/TCGA Pan-Cancer Analysis of Whole Genomes (PCAWG) Consortium, which aggregated whole-genome sequencing data and RNA sequencing from a common set of 1220 cancer cases, we report hundreds of genes for which the presence within 100 kb of an SV breakpoint associates with altered expression. For the majority of these genes, expression increases rather than decreases with corresponding breakpoint events. Up-regulated cancer-associated genes impacted by this phenomenon include TERT, MDM2, CDK4, ERBB2, CD274, PDCD1LG2, and IGF2. TERT-associated breakpoints involve ~3% of cases, most frequently in liver biliary, melanoma, sarcoma, stomach, and kidney cancers. SVs associated with up-regulation of PD1 and PDL1 genes involve ~1% of non-amplified cases. For many genes, SVs are significantly associated with increased numbers or greater proximity of enhancer regulatory elements near the gene. DNA methylation near the promoter is often increased with nearby SV breakpoint, which may involve inactivation of repressor elements.
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