Transcriptome profiling of a multiple recurrent muscle-invasive urothelial carcinoma of the bladder by deep sequencing

PLoS One. 2014 Mar 12;9(3):e91466. doi: 10.1371/journal.pone.0091466. eCollection 2014.

Abstract

Urothelial carcinoma of the bladder (UCB) is one of the commonly diagnosed cancers in the world. The UCB has the highest rate of recurrence of any malignancy. A genome-wide screening of transcriptome dysregulation between cancer and normal tissue would provide insight into the molecular basis of UCB recurrence and is a key step to discovering biomarkers for diagnosis and therapeutic targets. Compared with microarray technology, which is commonly used to identify expression level changes, the recently developed RNA-seq technique has the ability to detect other abnormal regulations in the cancer transcriptome, such as alternative splicing. In this study, we performed high-throughput transcriptome sequencing at ∼50× coverage on a recurrent muscle-invasive cisplatin-resistance UCB tissue and the adjacent non-tumor tissue. The results revealed cancer-specific differentially expressed genes between the tumor and non-tumor tissue enriched in the cell adhesion molecules, focal adhesion and ECM-receptor interaction pathway. Five dysregulated genes, including CDH1, VEGFA, PTPRF, CLDN7, and MMP2 were confirmed by Real time qPCR in the sequencing samples and the additional eleven samples. Our data revealed that more than three hundred genes showed differential splicing patterns between tumor tissue and non-tumor tissue. Among these genes, we filtered 24 cancer-associated alternative splicing genes with differential exon usage. The findings from RNA-Seq were validated by Real time qPCR for CD44, PDGFA, NUMB, and LPHN2. This study provides a comprehensive survey of the UCB transcriptome, which provides better insight into the complexity of regulatory changes during recurrence and metastasis.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Aged
  • Alternative Splicing
  • Cisplatin / pharmacology
  • Cisplatin / therapeutic use
  • Computational Biology
  • Drug Resistance, Neoplasm
  • Exons / genetics
  • Gene Expression Profiling*
  • Gene Ontology
  • Genes, Neoplasm / genetics
  • High-Throughput Nucleotide Sequencing*
  • Humans
  • Male
  • Molecular Sequence Annotation
  • Muscles / pathology*
  • Neoplasm Invasiveness
  • Recurrence
  • Sequence Analysis, RNA
  • Urinary Bladder Neoplasms / drug therapy
  • Urinary Bladder Neoplasms / genetics*
  • Urinary Bladder Neoplasms / pathology*
  • Urothelium / pathology*

Substances

  • Cisplatin

Associated data

  • SRA/SRP009386

Grants and funding

This work was supported by 2013 Hainan Provincial Natural Science Foundation (Grant number: 813256), Key Municipal Scientific Project of Haikou (Grant number: 2012-073), and Key Scientific Project of Hainan Province (Title: Preliminary screening of molecular markers in bladder cancer by high-throughput transcriptome sequencing). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.