Poster Open Access

Pattern mining of mass spectrometry quality control data

Bittremieux, Wout; Valkenborg, Dirk; Mrzic, Aida; Willems, Hanny; Goethals, Bart; Laukens, Kris

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"description": "<p><strong>Pattern mining of mass spectrometry quality control data</strong></p>\n\n<p>Mass spectrometry is widely used to identify proteins based on the mass distribution of their peptides. Unfortunately, because of its inherent complexity, the results of a mass spectrometry experiment can be subject to a large variability. As a means of quality control, recently several qualitative metrics have been defined. [1] Initially these quality control metrics were evaluated independently in order to separately assess particular stages of a mass spectrometry experiment. However, this method is insufficient because the different stages of an experiment do not function in isolation, instead they will influence each other. As a result, subsequent work employed a multivariate statistics approach to assess the correlation structure of the different quality control metrics. [2] However, by making use of some more advanced data mining techniques, additional useful information can be extracted from these quality control metrics.</p>\n\n<p>Various pattern mining techniques can be employed to discover hidden patterns in this quality control data. Subspace clustering tries to detect clusters of items based on a restricted set of dimensions. [3] This can be leveraged to for example detect aberrant experiments where only a few of the quality control metrics are outliers, but the experiment still behaved correctly in general.<br />\nIn addition, specialized frequent itemset mining and association rule learning techniques can be used to discover relationships between the various stages of a mass spectrometry experiment, as they are exhibited by the different quality control metrics.<br />\nFinally, a major source of untapped information lies in the temporal aspect. Most often, problems in a mass spectrometry setup appear gradually, but are only observed after a critical juncture. As previous analyses have not used this temporal information directly, there remains a large potential to detect these problems as soon as they start to manifest by taking this additional dimension of information into account. Based on the previously discovered patterns, these can be evaluated over time by making use of sequential pattern mining techniques.</p>\n\n<p>The awareness has risen that suitable quality control information is mandatory to assess the validity of a mass spectrometry experiment. Current efforts aim to standardize this quality control information [4], which will facilitate the dissemination of the data. This results in a large amount of as of yet untapped information, which can be leveraged by making use of specific data mining techniques in order to harness the full power of this new information.</p>\n\n<p>[1] Rudnick, P. A. et al. Performance metrics for liquid chromatography-tandem mass spectrometry systems in proteomics analyses. Molecular &amp; Cellular Proteomics 9, 225&ndash;241 (2010).<br />\n[2] Wang, X. et al. QC metrics from CPTAC raw LC-MS/MS data interpreted through multivariate statistics. Analytical Chemistry 86, 2497&ndash;2509 (2014).<br />\n[3] Aksehirli, E., Goethals, B., M&uuml;ller, E. &amp; Vreeken, J. Cartification: A neighborhood preserving transformation for mining high dimensional data. in Thirteenth IEEE International Conference on Data Mining - ICDM &rsquo;13 937&ndash;942 (IEEE, 2013). doi:10.1109/ICDM.2013.146<br />\n[4] Walzer, M. et al. qcML: An exchange format for quality control metrics from mass spectrometry experiments. Molecular &amp; Cellular Proteomics (2014). doi:10.1074/mcp.M113.035907</p>",
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"publication_date": "2014-09-07",
"creators": [
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"affiliation": "University of Antwerp, Antwerp, Belgium",
"name": "Bittremieux, Wout"
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{
"affiliation": "VITO, Mol, Belgium",
"name": "Valkenborg, Dirk"
},
{
"affiliation": "University of Antwerp, Antwerp, Belgium",
"name": "Mrzic, Aida"
},
{
"affiliation": "VITO, Mol, Belgium",
"name": "Willems, Hanny"
},
{
"affiliation": "University of Antwerp, Antwerp, Belgium",
"name": "Goethals, Bart"
},
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"affiliation": "University of Antwerp, Antwerp, Belgium",
"name": "Laukens, Kris"
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"meeting": {
"acronym": "ECCB",
"url": "http://www.eccb14.org/",
"dates": "7-10 September 2014",
"place": "Strasbourg, France",
"title": "European Conference on Computational Biology"
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