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Johnson, Jeanette A I; Tsang, Ashley P; Mitchell, Jacob T; Zhou, David L; Bowden, Julia; Davis-Marcisak, Emily; Sherman, Thomas; Liefeld, Ted; Loth, Melanie; Goff, Loyal A; Zimmerman, Jacquelyn W; Kinny-Köster, Ben; Jaffee, Elizabeth M; Tamayo, Pablo; Mesirov, Jill P; Reich, Michael; Fertig, Elana J; Stein-O'Brien, Genevieve L
Nature protocols, 12/2023, Letnik: 18, Številka: 12Journal Article
Non-negative matrix factorization (NMF) is an unsupervised learning method well suited to high-throughput biology. However, inferring biological processes from an NMF result still requires additional post hoc statistics and annotation for interpretation of learned features. Here, we introduce a suite of computational tools that implement NMF and provide methods for accurate and clear biological interpretation and analysis. A generalized discussion of NMF covering its benefits, limitations and open questions is followed by four procedures for the Bayesian NMF algorithm Coordinated Gene Activity across Pattern Subsets (CoGAPS). Each procedure will demonstrate NMF analysis to quantify cell state transitions in a public domain single-cell RNA-sequencing dataset. The first demonstrates PyCoGAPS, our new Python implementation that enhances runtime for large datasets, and the second allows its deployment in Docker. The third procedure steps through the same single-cell NMF analysis using our R CoGAPS interface. The fourth introduces a beginner-friendly CoGAPS platform using GenePattern Notebook, aimed at users with a working conceptual knowledge of data analysis but without a basic proficiency in the R or Python programming language. We also constructed a user-facing website to serve as a central repository for information and instructional materials about CoGAPS and its application programming interfaces. The expected timing to setup the packages and conduct a test run is around 15 min, and an additional 30 min to conduct analyses on a precomputed result. The expected runtime on the user's desired dataset can vary from hours to days depending on factors such as dataset size or input parameters.
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