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Human cell transformation by combined lineage conversion and oncogene expression.

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Specific cancer-driving mutations transform cells only when they are in a particular lineage and differentiation state. This finding reveals cell identity is key to tumorigenesis, impacting cancer research.

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Area of Science:

  • Oncology
  • Cell Biology
  • Genetics

Background:

  • Cancer involves complex genetic mutations in over 250 genes.
  • Identifying specific mutations driving human tumorigenesis remains challenging.

Purpose of the Study:

  • To investigate the role of specific oncogenes (CTNNB1, TERT, MYC) in liver cancer development.
  • To determine how cellular lineage and differentiation state influence oncogene-induced transformation.

Main Methods:

  • Inducing senescence in human fibroblasts and hepatocytes with characteristic liver cancer oncogenes.
  • Reprogramming fibroblasts into induced hepatocytes (iHeps).
  • Assessing the transformation, proliferation, and tumorigenicity of reprogrammed cells upon oncogene introduction.

Main Results:

  • The specific oncogene combination (CTNNB1, TERT, MYC) induced senescence in normal fibroblasts and hepatocytes.
  • Reprogrammed iHeps became sensitive to transformation by the same oncogenes.
  • Transformed iHeps exhibited high proliferation, tumorigenicity in mice, and liver cancer gene expression signatures.

Conclusions:

  • Tumorigenesis is a multifactorial process involving driver mutations, cellular lineage, and differentiation state.
  • Cell identity is a critical determinant in cellular transformation.
  • This study establishes a model for dynamic oncogenic driver roles in human tumorigenesis.