Research Paper | Open Access
Andrei Dragomir, Seferina Mavroudi, Anastasios Bezerianos, "Som-Based Class Discovery Exploring the ICA-Reduced Features of Microarray Expression Profiles", International Journal of Genomics, vol. 5, Article ID 340852, 21 pages, 2004. https://doi.org/10.1002/cfg.444
Som-Based Class Discovery Exploring the ICA-Reduced Features of Microarray Expression Profiles
Gene expression datasets are large and complex, having many variables and unknown internal structure. We apply independent component analysis (ICA) to derive a less redundant representation of the expression data. The decomposition produces components with minimal statistical dependence and reveals biologically relevant information. Consequently, to the transformed data, we apply cluster analysis (an important and popular analysis tool for obtaining an initial understanding of the data, usually employed for class discovery). The proposed self-organizing map (SOM)-based clustering algorithm automatically determines the number of ‘natural’ subgroups of the data, being aided at this task by the available prior knowledge of the functional categories of genes. An entropy criterion allows each gene to be assigned to multiple classes, which is closer to the biological representation. These features, however, are not achieved at the cost of the simplicity of the algorithm, since the map grows on a simple grid structure and the learning algorithm remains equal to Kohonen’s one.
Copyright © 2004 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.