Molecular Predictors of 3 D Morphogenesis by Breast Cancer Cell Lines in 3 D Culture

Correlative analysis of molecular markers with phenotypic signatures is the simplest model for hypothesis generation. In this paper, a panel of 24 breast cell lines was grown in 3D culture, their morphology was imaged through phase contrast microscopy, and computational methods were developed to segment and represent each colony at multiple dimensions. Subsequently, subpopulations from these morphological responses were identified through consensus clustering to reveal three clusters of round, grape-like, and stellate phenotypes. In some cases, cell lines with particular pathobiological phenotypes clustered together (e.g., ERBB2 amplified cell lines sharing the same morphometric properties as the grape-like phenotype). Next, associations with molecular features were realized through (i) differential analysis within each morphological cluster, and (ii) regression analysis across the entire panel of cell lines. In both cases, the dominant genes that are predictive of the morphological signatures were identified. Specifically, PPARc has been associated with the invasive stellate morphological phenotype, which corresponds to triple-negative pathobiology. PPARc has been validated through two supporting biological assays. Citation: Han J, Chang H, Giricz O, Lee GY, Baehner FL, et al. (2010) Molecular Predictors of 3D Morphogenesis by Breast Cancer Cell Lines in 3D Culture. PLoS Comput Biol 6(2): e1000684. doi:10.1371/journal.pcbi.1000684 Editor: Uwe Ohler, Duke University, United States of America Received January 27, 2009; Accepted January 25, 2010; Published February 26, 2010 Copyright: 2010 Han et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. Funding: This work was supported by the U.S. Department of Energy, Office of Science, Office of Biological and Environmental Research (contract DE-AC0205CH11231); the National Institutes of Health under grants U54 CA112970, CA58207, and CA090788; Susan G. Komen for the Cure (KG091136); and the Avon Foundation. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript. Competing Interests: The authors have declared that no competing interests exist. * E-mail: B_Parvin@lbl.gov ¤ Current address: Genentech, South San Francisco, California, United States of America

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