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Reversal of aberrant cancer methylome and transcriptome upon direct reprogramming of lung cancer cells

Dashayini Mahalingam1, Chiou Mee Kong, Jason Lai

  • 1Department of Biochemistry, Yong Loo Lin School of Medicine, National University of Singapore, Singapore.

Scientific Reports
|August 23, 2012
PubMed

Insights

Direct reprogramming of non-small cell lung cancer (NSCLC) cells into induced pluripotent stem cells (iPSCs) reverses epigenetic changes. This reprogramming reduces tumorigenic potential by restoring normal gene expression and DNA methylation patterns.

Area of Science:

  • Oncology
  • Epigenetics
  • Stem Cell Biology

Background:

  • Cancer cell reprogramming (iPSCs) highlights epigenetics' role in tumorigenesis.
  • Previous studies lacked genome-wide analysis of this process in lung cancer.

Purpose of the Study:

  • To generate induced pluripotent stem cells (iPSCs) from non-small cell lung cancer (NSCLC) cell lines.
  • To investigate the genome-wide epigenetic and transcriptional changes during NSCLC reprogramming.

Main Methods:

  • Generation of iPSCs from NSCLC cell lines.
  • Assessment of pluripotency markers, gene expression, and in vitro differentiation.
  • Genome-wide DNA methylation analysis.

Main Results:

  • Reprogrammed NSCLC cells exhibited characteristics of embryonic and induced pluripotent stem cells.
  • Genome-wide methylation analysis revealed reversal of aberrant methylation in developmental genes and tumor suppressors.
  • Upregulated NSCLC genes (KRT19, S100P) and oncogene/tumor suppressor status changes were partially explained by DNA methylation reversal.

Conclusions:

  • DNA methylation patterns correlate with transcriptional changes, potentially explaining reduced tumorigenicity in NSCLC-derived iPSCs.
  • Reprogramming effectively reverses aberrant epigenetic and transcriptional dysregulation in NSCLC.

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