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K-RAS4A: Lead or Supporting Role in Cancer Biology?

Veronica Aran1

  • 1Laboratorio de Biomedicina Do Cérebro, Instituto Estadual Do Cérebro Paulo Niemeyer, Rio de Janeiro, Brazil.

Frontiers in Molecular Biosciences
|October 4, 2021
PubMed

Insights

The K-RAS oncogene

Area of Science:

  • Oncology
  • Molecular Biology
  • Genetics

Background:

  • The RAS oncogene is frequently mutated in human cancers, with K-RAS playing a key role in tumorigenesis.
  • K-RAS alternative splicing produces two isoforms, K-RAS4A and K-RAS4B, which share high homology but have distinct functions and expression patterns.
  • While K-RAS4B has been the primary focus, the role of K-RAS4A in cancer remains less understood.

Purpose of the Study:

  • To review the existing evidence on the K-RAS4A splice variant.
  • To evaluate the potential leading role of K-RAS4A in cancer biology.
  • To contrast the roles of K-RAS4A and K-RAS4B in oncogenesis.

Main Methods:

  • Comprehensive literature review of studies investigating K-RAS4A.
  • Analysis of evidence regarding K-RAS4A expression, localization, and function.
  • Comparative assessment of K-RAS4A and K-RAS4B roles in cancer development.

Main Results:

  • K-RAS4A and K-RAS4B are generated from the same K-RAS transcript via alternative splicing.
  • Both isoforms are targeted to the plasma membrane through distinct motifs.
  • Evidence suggests nonredundant functions for K-RAS4A and K-RAS4B.

Conclusions:

  • A significant body of evidence supports a leading role for K-RAS4A in cancer biology.
  • K-RAS4A may play a more critical role in tumorigenesis than previously recognized.
  • Future research should differentiate between K-RAS isoforms to fully understand K-RAS-driven cancers.
Keywords:
K-Ras4AK-Ras4BK-rasalternative splicingcancer

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