Author of

• 17398

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  P2.01 - Poster Session with Presenters Present (ID 461)

  • Event: WCLC 2016
  • Type: Poster Presenters Present
  • Track: Biology/Pathology
  • Presentations: 1
  • Moderators:
  • Coordinates: 12/06/2016, 14:30 - 15:45, Hall B (Poster Area)

  • 17413

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    P2.01-015 - Differentially Expressed microRNAs in Lung Adenocarcinoma Invert Effects of Copy Number Aberrations of Prognostic Genes (ID 4771)

    14:30 - 14:30  |  Author(s): C. Chiara Pastrello
    • Abstract

    Background:
    Across multiple cancer histologies, many significantly down-regulated genes reside within chromosomal regions with increased number of copies, and vice versa. These “paradoxical genes” have been usually ignored as a noise, but could be a consequence of epigenetic regulatory mechanisms, including microRNA-mediated control of mRNA transcription.
    
    Methods:
    To identify paradoxical genes in lung adenocarcinoma (LUAD) we curated and analyzed gene expression and copy number aberrations across 1,064 LUAD samples, including newly-generated aCGH data from 65 samples. We then analyzed 9 LUAD microRNA expression studies to compile a list of consistently deregulated microRNAs. Finally, using microRNA:gene networks from mirDIP we examined possible association between microRNAs and paradoxical genes.
    
    Results:
    We identified 85 genes whose differential expression consistently contrasts the aberrations of their copy numbers. 70 genes were validated using TCGA-LUAD data. We showed that paradoxical expression of these genes is associated with 19 microRNAs, whose significant deregulation in LUAD has been consistently reported. Importantly, these genes form a clinically significant prognostic signature.Figure 1Figure 2
    
    
    
    
    
    Conclusion:
    Paradoxical gene expression, caused by microRNA deregulation, is preserved across patient cohorts, and forms a prognostic LUAD signature.