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These could range from asymmetric non-Gaussian distributions to outliers and tail subpopulations, which need to be modeled with precision and rigor.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>To ensure precision and rigor, we propose a parametric modeling framework StateProfiler based on finite mixtures of skew<jats:italic>t<\/jats:italic>-Normal distributions that are robust against non-Gaussian features caused by asymmetry and outliers in data. Further, we present in StateProfiler a new greedy EM algorithm for fast and optimal model selection. The parsimonious approach of our greedy algorithm allows us to detect the genuine dynamic variation in the key features as and when they appear in time course data. We also present a procedure to construct a well-fitted profile by merging any redundant model components in a way that minimizes change in entropy of the resulting model. This allows precise profiling of unusually shaped distributions and less well-separated features that may appear due to cellular heterogeneity even within clonal populations.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>By modeling flow cytometric data measured over time course and marker space with StateProfiler, specific parametric characteristics of cellular states can be identified. The parameters are then tested statistically for learning global and local patterns of spatio-temporal change. We applied StateProfiler to identify the temporal features of yeast cell cycle progression based on knockout of S-phase triggering cyclins Clb5 and Clb6, and then compared the S-phase delay phenotypes due to differential regulation of the two cyclins. We also used StateProfiler to construct the temporal profile of clonal divergence underlying lineage selection in mammalian hematopoietic progenitor cells.<\/jats:p><\/jats:sec>","DOI":"10.1186\/1471-2105-13-s5-s5","type":"journal-article","created":{"date-parts":[[2012,4,12]],"date-time":"2012-04-12T10:17:42Z","timestamp":1334225862000},"update-policy":"http:\/\/dx.doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":11,"title":["Parametric modeling of cellular state transitions as measured with flow cytometry"],"prefix":"10.1186","volume":"13","author":[{"given":"Hsiu J","family":"Ho","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Tsung I","family":"Lin","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Hannah H","family":"Chang","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Steven B","family":"Haase","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Sui","family":"Huang","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Saumyadipta","family":"Pyne","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2012,4,12]]},"reference":[{"key":"5132_CR1","doi-asserted-by":"publisher","first-page":"21","DOI":"10.1002\/cyto.a.20003","volume":"58","author":"Z Darzynkiewicz","year":"2004","unstructured":"Darzynkiewicz Z, Crissman H, Jacobberger JW: Cytometry of the cell cycle: cycling through history. 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