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Issue No.04 - April (2012 vol.24)
pp: 634-648
Xin Zhang , New York University, New York
Dennis Shasha , New York University, New York
Yang Song , New Jersey Institute of Technology and UMDNJ-New Jersey Medical School Cancer Center, Newark
Jason T.L. Wang , New Jersey Institute of Technology, Newark
We study a data mining problem concerning the elastic peak detection in 2D liquid chromatography-mass spectrometry (LC-MS) data. These data can be modeled as time series, in which the X-axis represents time points and the Y-axis represents intensity values. A peak occurs in a set of 2D LC-MS data when the sum of the intensity values in a sliding time window exceeds a user-determined threshold. The elastic peak detection problem is to locate all peaks across multiple window sizes of interest in the data set. We propose a new data structure, called a Shifted Aggregation Tree or AggTree for short, and use the data structure to find the different peaks. Our method, called PeakID, solves the elastic peak detection problem in 2D LC-MS data yielding neither false positives nor false negatives. The method works by first constructing an AggTree in a bottom-up manner from the given data set, and then searching the AggTree for the peaks in a top-down manner. We describe a state-space algorithm for finding the topology and structure of an efficient AggTree to be used by PeakID. Our experimental results demonstrate the superiority of the proposed method over other methods on both synthetic and real-world data.
Knowledge discovery from LC-MS data, time series data mining, bioinformatics, computational proteomics, algorithms and data structures.
Xin Zhang, Dennis Shasha, Yang Song, Jason T.L. Wang, "Fast Elastic Peak Detection for Mass Spectrometry Data Mining", IEEE Transactions on Knowledge & Data Engineering, vol.24, no. 4, pp. 634-648, April 2012, doi:10.1109/TKDE.2010.238
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