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Issue No. 05 - September/October (2011 vol. 8)
ISSN: 1545-5963
pp: 1417-1424
Getachew K. Befekadu , Georgetown University Medical Center, Washington DC
Mahlet G. Tadesse , Georgetown University, Washington DC
Tsung-Heng Tsai , Virginia Polytechnic Institute and State University, Arlington
Habtom W. Ressom , Georgetown University Medical Center, Washington DC
A novel framework of a probabilistic mixture regression model (PMRM) is presented for alignment of liquid chromatography-mass spectrometry (LC-MS) data with respect to retention time (RT) points. The expectation maximization algorithm is used to estimate the joint parameters of spline-based mixture regression models and prior transformation density models. The latter accounts for the variability in RT points and peak intensities. The applicability of PMRM for alignment of LC-MS data is demonstrated through three data sets. The performance of PMRM is compared with other alignment approaches including dynamic time warping, correlation optimized warping, and continuous profile model in terms of coefficient variation of replicate LC-MS runs and accuracy in detecting differentially abundant peptides/proteins.
Liquid chromatography, mass spectrometry, mixed-regression model, expectation-maximization.

G. K. Befekadu, H. W. Ressom, T. Tsai and M. G. Tadesse, "Probabilistic Mixture Regression Models for Alignment of LC-MS Data," in IEEE/ACM Transactions on Computational Biology and Bioinformatics, vol. 8, no. , pp. 1417-1424, 2010.
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