July 23, 2018 Presentation Open Access

Bittremieux, Wout; Meysman, Pieter; Noble, William Stafford; Laukens, Kris

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        <foaf:name>Bittremieux, Wout</foaf:name>
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    <dct:title>Fast open modification spectral library searching through approximate nearest neighbor indexing</dct:title>
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    <dct:description>&lt;p&gt;Open modification search (OMS) is a powerful search strategy that identifies peptides carrying any type of modification by allowing a modified spectrum to match against its unmodified variant by using a very wide precursor mass window. A drawback of this strategy, however, is that it leads to a large increase in search time. Although performing an open search can be done using existing spectral library search engines by simply setting a wide precursor mass window, none of these tools have been optimized for OMS, leading to excessive runtimes and suboptimal identification results.&lt;/p&gt; &lt;p&gt;Here we present the ANN-SoLo tool for fast and accurate open spectral library searching. ANN-SoLo uses approximate nearest neighbor indexing to speed up OMS by selecting only a limited number of the most relevant library spectra to compare to an unknown query spectrum. This approach is combined with a cascade search strategy to maximize the number of identified unmodified and modified spectra while strictly controlling the false discovery rate, as well as a shifted dot product score to sensitively match modified spectra to their unmodified counterparts.&lt;/p&gt; &lt;p&gt;ANN-SoLo outperforms the state-of-the-art SpectraST spectral library search engine both in terms of speed and the number of identifications. On a previously published human cell line data set, ANN-SoLo confidently identifies 40% more spectra than SpectraST while achieving a speedup of an order of magnitude.&lt;/p&gt; &lt;p&gt;ANN-SoLo is implemented in Python and C++. It is freely available under the Apache 2.0 license at https://github.com/bittremieux/ANN-SoLo.&lt;/p&gt;</dct:description>
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