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Updated: Aug 8, 2025

Characterize Disease-related Mutants of RAF Family Kinases by Using a Set of Practical and Feasible Methods
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Ras protein abundance correlates with Ras isoform mutation patterns in cancer

Fiona E Hood1, Yasmina M Sahraoui1, Rosalind E Jenkins2

  • 1Department of Molecular Physiology and Cell Signalling, Institute of Systems, Molecular and Integrative Biology, University of Liverpool, Liverpool, L69 3BX, UK.

Oncogene
|March 2, 2023
PubMed

Insights

Higher KRAS protein levels, not rare codons, may explain its frequent mutation in cancer. This Ras dosage sweet-spot model impacts cancer and development.

Area of Science:

  • Molecular Biology
  • Oncology
  • Genetics

Background:

  • Activating Ras gene mutations are common in cancer.
  • KRAS is mutated more frequently than HRAS and NRAS in cancer and RASopathies, but the reasons are unclear.
  • The protein products of Ras genes are nearly identical.

Purpose of the Study:

  • To quantify HRAS, NRAS, KRAS4A, and KRAS4B protein abundance in cell lines and tissues.
  • To investigate the correlation between Ras isoform protein expression and mutation frequencies in cancer.
  • To explore the role of Ras dosage in cancer development and isoform-specific contributions.

Main Methods:

  • Quantitative analysis of HRAS, NRAS, KRAS4A, and KRAS4B protein levels.
  • Comparison of protein abundance across diverse cell lines and healthy tissues.
  • Correlation analysis with known Ras mutation frequencies in various cancers.

Main Results:

  • Consistent KRAS > NRAS > HRAS protein expression patterns were observed.
  • These expression patterns correlate with the rank order of Ras mutation frequencies in cancer.
  • Mutant vs. wild-type KRAS protein abundance showed frequent imbalance, suggesting non-gene duplication mechanisms.

Conclusions:

  • Ras protein dosage, particularly high KRAS levels, may define a 'sweet-spot' influencing cancer and development.
  • High abundance of KRAS, rather than rare codons, likely underlies its predominant mutation in cancer.
  • Isoform-specific Ras dosage contributes to oncogenesis, with HRAS and NRAS typically insufficient for transformation when mutated.

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