期刊
NATURE COMMUNICATIONS
卷 11, 期 1, 页码 -出版社
NATURE PORTFOLIO
DOI: 10.1038/s41467-020-18099-z
关键词
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资金
- NIH [GM114362, RR24851]
- Salk Innovation Grant
- Rita Allen Foundation Scholars Program
- Hearst Foundation
- Glenn Center for Research on Aging at the Salk Institute
- Salk Women and Science award
- UCSD Microscopy Core (NINDS) [NS047101]
Oncogene amplification, a major driver of cancer pathogenicity, is often mediated through focal amplification of genomic segments. Recent results implicate extrachromosomal DNA (ecDNA) as the primary driver of focal copy number amplification (fCNA) - enabling gene amplification, rapid tumor evolution, and the rewiring of regulatory circuitry. Resolving an fCNA's structure is a first step in deciphering the mechanisms of its genesis and the fCNA's subsequent biological consequences. We introduce a computational method, AmpliconReconstructor (AR), for integrating optical mapping (OM) of long DNA fragments (>150kb) with next-generation sequencing (NGS) to resolve fCNAs at single-nucleotide resolution. AR uses an NGS-derived breakpoint graph alongside OM scaffolds to produce high-fidelity reconstructions. After validating its performance through multiple simulation strategies, AR reconstructed fCNAs in seven cancer cell lines to reveal the complex architecture of ecDNA, a breakage-fusion-bridge and other complex rearrangements. By reconstructing the rearrangement signatures associated with an fCNA's generative mechanism, AR enables a more thorough understanding of the origins of fCNAs. Focal copy number amplifications (fCNAs), which drive cancer pathogenicity, arise by a number of mechanisms and can be challenging to call. Here the authors present AmpliconReconstructor for precise and scalable fCNA reconstruction using optical mapping and next-generation sequencing data.
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