title: [Differential gene expression profiling for identification of protective transcription factors in different subtypes of nasopharyngeal carcinoma].
abstract: OBJECTIVE
  To analyze the dysregulated genes among the differentially expressed genes in 41 nasopharyngeal biopsy samples and identify their protective transcriptional factors.
  
  
  METHODS
  The differentially expressed gene profiles were obtained by analyzing both types I and II nasopharyngeal carcinoma (NPC_I and NPC_II, respectively) using EXCEL and Bioinformatics tools. The transcriptional factors were further studied only when (1) the difference in the binding sites of the differentially expressed genes between NPC_I and NPC_II groups was statistically significant, (2) the expressions of the transcription factors were correlated with the gene expressions in the samples, and (3) the transcription factors affected at least 40% of the expression of the related genes.
  
  
  RESULTS
  In NPC_I samples, 80 transcription factors were found to be up-regulated, in which RUNX3, GATA3, NR3C1, NRF1, RXRA, SMAD7, TBP, and ZBTB6 were positive factors and HLF and MTF1 were negative factors, involved in the regulation of the genes in T cell receptor signaling pathway. No eligible transcription factors were found in association with down-regulated genes in NPC_I compared to NPC_II gene expression profiles.
  
  
  CONCLUSIONS
  The over-expressed genes in NPC_I are mainly related to immune responses, and we found 8 positive factors and 2 negative factors that regulate the genes in T cell receptor signaling pathway. The 10 transcription factors may serve as potential therapeutic targets for NPC_I. We failed to identify any transcription factors associated with down-regulated genes in NPC_I relative to NPC_II possibly as a result of multiple factors that affect the differential gene expressions in NPC_II including the transcription factors, DNA phosphorylation and modification, chromosome variation and environmental factors.
authors.affiliation: Direct MD Class (8-year Program), Grade 2007, First Clinical Medical College, Southern Medical University, Guangzhou 510515, China.E-mail: 837949436@qq.com.
authors.forename: Chunyue
authors.initials: C
authors.lastname: Huang
authors.forename: Pei
authors.initials: P
authors.lastname: Lin
authors.forename: Jiahong
authors.initials: J
authors.lastname: Wang
authors.forename: Zhongxi
authors.initials: Z
authors.lastname: Huang
mesh_terms: D002277:Carcinoma; D020869:Gene Expression Profiling; D015972:Gene Expression Regulation, Neoplastic; D006801:Humans; D000077274:Nasopharyngeal Carcinoma; D009303:Nasopharyngeal Neoplasms / Q000145:classification / Q000235:genetics* / Q000378:metabolism / Q000473:pathology; D011948:Receptors, Antigen, T-Cell / Q000235:genetics / Q000378:metabolism; D015398:Signal Transduction; D014157:Transcription Factors / Q000235:genetics* / Q000378:metabolism
chemical_list: D011948:Receptors, Antigen, T-Cell; D014157:Transcription Factors