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Deregulation of Rab and Rab effector genes in bladder cancer

Joel R Ho1, Elodie Chapeaublanc, Lisa Kirkwood

  • 1Institut Curie, Centre de Recherche, Paris, France.

Plos One
|June 23, 2012
PubMed

Insights

Rab GTPases are crucial for intracellular transport and play a role in cancer. This study analyzed Rab gene deregulation in bladder cancer, finding specific gene changes linked to tumor pathways and progression, offering insights into cancer pathogenesis.

Area of Science:

  • Molecular Biology
  • Oncology
  • Genetics

Background:

  • Rab GTPases are key regulators of intracellular transport.
  • Dysregulation of Rab GTPases is implicated in various cancers.
  • Bladder cancer exhibits distinct progression pathways, including FGFR3-mutated and non-mutated types.

Purpose of the Study:

  • To analyze transcriptional deregulation of Rab proteins and interacting proteins in bladder cancer.
  • To differentiate gene deregulation patterns between FGFR3-mutated and non-mutated bladder cancer pathways.
  • To investigate the association of Rab gene expression with tumor proliferation and differentiation markers.

Main Methods:

  • Systematic literature search for Rab and Rab-interacting proteins.
  • Transcriptomic data analysis of normal urothelium and bladder tumors.
  • Statistical analysis using SAM (significant analysis of microarray) test and binomial test.
  • Cluster analysis to identify gene clusters associated with bladder cancer pathways.

Main Results:

  • Overall, 30 genes were down-regulated and 13 up-regulated in bladder tumors.
  • Five genes (LEPRE1, MICAL2, RAB23, STXBP1, SYTL1) were specifically deregulated in FGFR3-non-mutated muscle-invasive tumors.
  • The RAB27 gene cluster was deregulated and associated with both bladder cancer pathways.
  • Specific Rab gene expressions correlated with proliferation and differentiation markers.

Conclusions:

  • Transcriptional deregulation of Rab and Rab-interacting genes is evident in bladder cancer.
  • Specific Rab gene alterations are linked to distinct bladder cancer subtypes and progression.
  • This systematic analysis provides insights into Rab protein roles in bladder cancer pathogenesis and suggests a broadly applicable methodology.

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