Discovering and Genotyping Twilight Zone Deletions

Marschall, Tobias; Schönhuth, Alexander

doi:10.1002/9781119272182.ch7

Cited by 1 publication

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“…Among such variants, midsize and also some longer insertions and deletions (indels) have remained a particularly complex issue (Marschall and Schönhuth, 2015). The problem is that these variants give rise to signals that interfere with the statistical uncertainties of the read alignment data.…”

Section: Introductionmentioning

confidence: 99%

Next generation cluster editing

Bellitto

Marschall

Schönhuth

et al. 2015

Preprint

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Genomic structural variations play key roles in genetic diversity and disease. Despite recent advances in structural variation discovery, many variants are yet to be discovered. Midsize insertions and deletions pose particularly involved algorithmic challenges. The recent CLEVER algorithm addressed these challenges with a statistical model on cliques in a graph whose nodes are read alignments and whose edges arise from a statistical test on length and overlap of read alignments. However, the resulting read alignment clusters tend to be too small and are heavily overlapping, which leads to losses in recall performance rates. Here we present a model based on weighted cluster editing, which alleviates these issues: clusters are provably non-overlapping and tend to be larger. In order to render the inherent optimization problem tractable on all read alignments of a genome, we present a novel, principled heuristic, which runs in time linear in the length of the genome. The heuristic is based on an exact polynomial-time algorithm for weighted cluster editing in one-dimensional point graphs. We demonstrate that the new model improves recall rates achieved by CLEVER.

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Section: Introductionmentioning

confidence: 99%