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Extrachromosomal DNA (ecDNA): an origin of tumor heterogeneity, genomic remodeling, and drug resistance

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Item Type:Review
Title:Extrachromosomal DNA (ecDNA): an origin of tumor heterogeneity, genomic remodeling, and drug resistance
Creators Name:Pecorino, L.T. and Verhaak, R.G.W. and Henssen, A. and Mischel, P.S.
Abstract:The genome of cancer cells contains circular extrachromosomal DNA (ecDNA) elements not found in normal cells. Analysis of clinical samples reveal they are common in most cancers and their presence indicates poor prognosis. They often contain enhancers and driver oncogenes that are highly expressed. The circular ecDNA topology leads to an open chromatin conformation and generates new gene regulatory interactions, including with distal enhancers. The absence of centromeres leads to random distribution of ecDNAs during cell division and genes encoded on them are transmitted in a non-mendelian manner. ecDNA can integrate into and exit from chromosomal DNA. The numbers of specific ecDNAs can change in response to treatment. This dynamic ability to remodel the cancer genome challenges long-standing fundamentals, providing new insights into tumor heterogeneity, cancer genome remodeling, and drug resistance.
Keywords:Cancer Genome, Drug Resistance, Extrachromosomal DNA, Genomic Remodelling, Oncogenes, Tumor Heterogeneity
Source:Biochemical Society Transactions
Publisher:Portland Press
Page Range:1911-1920
Date:December 2022
Official Publication:https://doi.org/10.1042/bst20221045
PubMed:View item in PubMed

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