Key Points
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High-throughput sequencing of cancer genomes, exomes and transcriptomes has enabled the identification of many novel somatic aberrations, and has provided new insights into cancer biology and new therapeutic targets.
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Computational and statistical tools are necessary for interpreting the large and complex data sets that result from high-throughput sequencing approaches.
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Mature software for detecting single-nucleotide variants, insertions and deletions, copy-number aberrations, structural variants and gene fusions in cancer genomes are now available. Additional challenges remain in increasing the sensitivity and specificity of these algorithms.
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Computational techniques are essential for assigning priority to somatic aberrations that are likely to be functional for further experimental validation. Two common approaches are to predict functional impact of individual mutations using prior biological knowledge and to identify recurrently mutated genes, pathways and networks across many samples.
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Algorithms to infer the clonal structure and evolutionary history of a tumour from ultra-deep sequencing data have recently been introduced. Applications of these techniques have shown that minority mutations in primary tumours may increase to majority in relapse or metastasis.
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Sequencing of cancer genomes has shown a wide range of specialized mutational processes, including kataegis, chromothripsis and chromoplexy that result in rapid genomic changes and punctuated tumour evolution.
Abstract
High-throughput DNA sequencing has revolutionized the study of cancer genomics with numerous discoveries that are relevant to cancer diagnosis and treatment. The latest sequencing and analysis methods have successfully identified somatic alterations, including single-nucleotide variants, insertions and deletions, copy-number aberrations, structural variants and gene fusions. Additional computational techniques have proved useful for defining the mutations, genes and molecular networks that drive diverse cancer phenotypes and that determine clonal architectures in tumour samples. Collectively, these tools have advanced the study of genomic, transcriptomic and epigenomic alterations in cancer, and their association to clinical properties. Here, we review cancer genomics software and the insights that have been gained from their application.
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Acknowledgements
This work was supported by the US National Human Genome Research Institute (grants U01HG006517 to L.D.; R01HG005690 and R01HG007069 to B.J.R.) and by the US National Cancer Institute (grant R01CA180006 to L.D.). The authors thank K. Ye and M. D. McLellan for comments.
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Glossary
- Pyrosequencing
-
A specific sequencing- by-synthesis method in which detection is based on chemiluminescent signals from luciferin conversion.
- Sequencing-by-ligation
-
A sequencing method based on the mismatch sensitivity of DNA ligase to detect nucleotides.
- Sequencing-by-synthesis
-
A sequencing method that uses sequential polymerization of nucleotides to a template, in which each incorporation is inferred by an imaging process, usually from a fluorescent dye attached to the added nucleotide.
- Driver mutations
-
Somatic mutations that have causal roles in initiation, progression, metastasis or recurrence of cancer.
- Significantly mutated genes
-
(SMGs). Genes with rates of somatic mutations that are higher than the random background rates, which suggests a role in tumour initiation or progression.
- Sequence coverage theory
-
A theory that characterizes sequencing processes mathematically to support development of detection methods, as well as analysis and design of sequencing projects.
- Type I errors
-
Errors made when effects are declared when none actually exists, which lead to false positives.
- Type II errors
-
Errors made when actual effects are overlooked, which lead to false negatives.
- Paired-end mapping
-
Coordinated mapping of both sequenced ends of a fragment to a reference genome, in which the approximately known separation between the two ends provides extra information against misalignments.
- Gapped alignment
-
An alignment process in which small gaps are allowed if they support a better fit.
- Split read
-
The phenomenon in which a read spans a deleted site, whereby the read appears to be split in its alignment to a reference.
- De novo assembly
-
Reconstruction of a genomic target by assessing consensus sequence from alignments of overlapping reads and clones.
- Precision
-
The fraction of the total number of called events that are true.
- Passenger mutations
-
Somatic mutations that arise incidentally and that have no mechanistic role in cancer initiation or progression.
- Background mutation rate
-
(BMR). The rate at which spontaneous mutations occur as a result of uncorrected copying errors.
- Kataegis
-
The appearance of regions of local hypermutations in a tumour genome.
- Chromothripsis
-
A catastrophic mutational event that 'shatters' one or more chromosomes, which leads to simultaneous loss and rearrangement of multiple chromosomal segments.
- Chromoplexy
-
A mutational event that results in substantial and complex rearrangements that involve multiple loci, although it is not as severe as chromothripsis and involves less clustering of rearrangement breakpoints.
- Clonal evolution
-
The emergence of novel clones that have improved survival or propagational fitness according to the particular sets of somatic mutations that have accumulated in these clones.
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Ding, L., Wendl, M., McMichael, J. et al. Expanding the computational toolbox for mining cancer genomes. Nat Rev Genet 15, 556–570 (2014). https://doi.org/10.1038/nrg3767
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DOI: https://doi.org/10.1038/nrg3767
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