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Screening of Differentially Expressed Genes Related to Bladder Cancer and Functional Analysis with DNA Microarray

  • Huang, Yi-Dong (Department of Pediatric Surgery, West China Hospital of Sichuan University) ;
  • Shan, Wei (Department of Pediatric Surgery, West China Hospital of Sichuan University) ;
  • Zeng, Li (Department of Pediatric Surgery, West China Hospital of Sichuan University) ;
  • Wu, Yang (Department of Pediatric Surgery, West China Hospital of Sichuan University)
  • Published : 2013.08.30

Abstract

Objective: The purpose of this study was to identify genes related to bladder cancer with samples from normal and disease cases by microarray chip. Methods: After downloading the gene expression profile GSE3167 from Gene Expression Omnibus database which includes 50 bladder samples, comprising 9 normal and 41 disease samples, differentially expressed genes were identified with packages in R language. The selected differentially expressed genes were further analyzed using bioinformatics methods. Firstly, molecular functions, biological processes and cell component analysis were researched by software Gestalt. Then, software String was used to search interaction relationships among differentially expressed genes, and hub genes of the network were selected. Finally, by using plugins of software Cytoscape, Mcode and Bingo, module analysis of hub-genes was performed. Results: A total of 221 genes were identified as differentially expressed by comparing normal and disease bladder samples, and a network as well as the hub gene C1QBP was obtained from the network. The C1QBP module had the closest relationship to production of molecular mediators involved in inflammatory responses. Conclusion: We obtained differentially expressed genes of bladder cancer by microarray, and both PRDX2 and YWHAZ in the module with hub gene C1QBP were most significantly related to production of molecular mediators involved in inflammatory responses. From knowledge of inflammatory responses and cancer, our results showed that, the hub gene and its module could induce inflammation in bladder cancer. These related genes are candidate bio-markers for bladder cancer diagnosis and might be helpful in designing novel therapies.

Keywords

Bladder cancer;differentially expressed gene;interaction network;function enrichment analysis;module analysis

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