GRIDSS, PURPLE, LINX: Unscrambling the tumor genome via integrated analysis of structural variation and copy number
Daniel CameroniD, Jonathan BaberiD, Charles ShaleiD, Anthony T. PapenfussiD, Jose Espejo Valle-InclániD, Nicolle J.M. BesselinkiD, Edwin P. J. G. CuppeniD, Peter PriestleyiD
Abstract
We have developed a novel, integrated and comprehensive purity, ploidy, structural variant and copy number somatic analysis toolkit for whole genome sequencing data of paired tumor/normal samples. We show that the combination of using GRIDSS for somatic structural variant calling and PURPLE for somatic copy number alteration calling allows highly sensitive, precise and consistent copy number and structural variant determination, as well as providing novel insights for short structural variants and regions of complex local topology. LINX, an interpretation tool, leverages the integrated structural variant and copy number calling to cluster individual structural variants into higher order events and chains them together to predict local derivative chromosome structure. LINX classifies and extensively annotates genomic rearrangements including simple and reciprocal breaks, LINE, viral and pseudogene insertions, and complex events such as chromothripsis. LINX also comprehensively calls genic fusions including chained fusions. Finally, our toolkit provides novel visualisation methods providing insight into complex genomic rearrangements.
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Abstract summary
Claude Opus 5.5 · xhigh effort · 18 Oct 2026 · from the abstract
A three-tool chain calls somatic structural variants, purity, ploidy and copy number from paired tumour/normal whole genomes, then clusters breakpoints into derivative chromosome structures and gene fusions.
An integrated toolkit for paired tumour/normal whole genomes couples a somatic structural variant caller with a somatic copy number alteration caller, which the abstract says gives highly sensitive, precise and consistent determination of both. An interpretation layer then goes beyond individual breakpoints to higher-order events such as chromothripsis and chained fusions.
Key results
ClaimedCombining GRIDSS structural variant calling with PURPLE copy number calling is said to yield highly sensitive, precise and consistent calls of both variant types, and to give new insight into short structural variants and regions of complex local topology.
Asserted in the abstract without sensitivity, precision or concordance figures, and without naming the competing callers or validation samples used for the comparison. · Abstract
ClaimedLINX takes the joint structural variant and copy number calls, groups individual breakpoints into higher-order events and chains them to predict the local structure of derivative chromosomes.
Described in the abstract; annotation categories cover reciprocal and simple breakages, insertions of LINE elements, viral sequence and pseudogenes, and complex events such as chromothripsis, with no accuracy assessment reported. · Abstract
ClaimedThe toolkit also calls genic fusions, including fusions formed across chained rearrangements, and provides visualisation methods for complex rearrangements.
Stated in the closing sentences of the abstract; no fusion recall or precision numbers, example cases or figure descriptions are available in the text. · Abstract
Methods, data and reproducibility
An integrated toolkit covering purity, ploidy, structural variants and copy number for whole genome sequencing of paired tumour/normal samples: GRIDSS calls somatic structural variants, PURPLE calls somatic copy number alterations, and LINX interprets the combined output by clustering variants into higher-order events, chaining them into predicted derivative chromosomes and calling fusions.
- Methods & tools
- GRIDSS, PURPLE, LINX
Limitations (2)
- Every performance claim in the available text is qualitative: no sensitivity, precision or runtime numbers are given and no competing structural variant or copy number caller is named as a comparator. · noted in this summary
- The samples, cohorts or truth sets used to evaluate the toolkit are not described, so the settings in which the claims hold cannot be judged. · noted in this summary
Who should read:Read this if you call somatic structural variants and copy number in tumour whole genomes and want an integrated caller pair plus an interpretation layer that reconstructs derivative chromosomes and fusions.
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