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Issue No. 03 - May/June (2011 vol. 8)
ISSN: 1545-5963
pp: 621-634
Jianxing Feng , Tsinghua Univ., Beijing
Rui Jiang , Tsinghua University, Beijing
Tao Jiang , University of California, Riverside
The emergence of high-throughput technologies leads to abundant protein-protein interaction (PPI) data and microarray gene expression profiles, and provides a great opportunity for the identification of novel protein complexes using computational methods. By combining these two types of data, we propose a novel Graph Fragmentation Algorithm (GFA) for protein complex identification. Adapted from a classical max-flow algorithm for finding the (weighted) densest subgraphs, GFA first finds large (weighted) dense subgraphs in a protein-protein interaction network, and then, breaks each such subgraph into fragments iteratively by weighting its nodes appropriately in terms of their corresponding log-fold changes in the microarray data, until the fragment subgraphs are sufficiently small. Our tests on three widely used protein-protein interaction data sets and comparisons with several latest methods for protein complex identification demonstrate the strong performance of our method in predicting novel protein complexes in terms of its specificity and efficiency. Given the high specificity (or precision) that our method has achieved, we conjecture that our prediction results imply more than 200 novel protein complexes.
Protein complex, protein-protein interaction network, microarray, dense subgraph, maximum network flow, efficient algorithm.

R. Jiang, T. Jiang and J. Feng, "A Max-Flow-Based Approach to the Identification of Protein Complexes Using Protein Interaction and Microarray Data," in IEEE/ACM Transactions on Computational Biology and Bioinformatics, vol. 8, no. , pp. 621-634, 2010.
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