title: Prioritization of potential candidate disease genes by topological similarity of protein-protein interaction network and phenotype data.
abstract: Identifying candidate disease genes is important to improve medical care. However, this task is challenging in the post-genomic era. Several computational approaches have been proposed to prioritize potential candidate genes relying on protein-protein interaction (PPI) networks. However, the experimental PPI network is usually liable to contain a number of spurious interactions. In this paper, we construct a reliable heterogeneous network by fusing multiple networks, a PPI network reconstructed by topological similarity, a phenotype similarity network and known associations between diseases and genes. We then devise a random walk-based algorithm on the reliable heterogeneous network called RWRHN to prioritize potential candidate genes for inherited diseases. The results of leave-one-out cross-validation experiments show that the RWRHN algorithm has better performance than the RWRH and CIPHER methods in inferring disease genes. Furthermore, RWRHN is used to predict novel causal genes for 16 diseases, including breast cancer, diabetes mellitus type 2, and prostate cancer, as well as to detect disease-related protein complexes. The top predictions are supported by literature evidence.
authors.affiliation: School of Information Science and Engineering, Hunan University, Changsha, China. Electronic address: luojiawei@hnu.edu.cn.
authors.forename: Jiawei
authors.initials: J
authors.lastname: Luo
authors.affiliation: School of Information Science and Engineering, Hunan University, Changsha, China.
authors.forename: Shiyu
authors.initials: S
authors.lastname: Liang
mesh_terms: D000465:Algorithms; D001943:Breast Neoplasms / Q000235:genetics; D019295:Computational Biology / Q000379:methods*; D003924:Diabetes Mellitus, Type 2 / Q000235:genetics; D005260:Female; D020022:Genetic Predisposition to Disease; D006801:Humans; D008297:Male; D015233:Models, Statistical; D010641:Phenotype; D011471:Prostatic Neoplasms / Q000235:genetics; D025941:Protein Interaction Mapping / Q000379:methods*; D060066:Protein Interaction Maps; D012984:Software
keywords: Disease genes; Phenotype; Protein–protein interaction networks; Random walk; Topological similarity