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Cancer and RASSF1A/RASSF1C, the Two Faces of Janus

Fatéméh Dubois1, Emmanuel Bergot2, Guénaëlle Levallet1

  • 1Normandie University, UNICAEN, Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Centre national de la recherche scientifique (CNRS), Imagerie et Stratégies Thérapeutiques des pathologies Cérébrales et Tumorales (ISTCT)/Cervoxy Group, Groupement d'intérêt publique (GIP) Cyceron, Caen, France; Department of Pathology, Centre Hospitalier Universitaire (CHU) de Caen, Caen, France.

Trends in Cancer
|November 19, 2019
PubMed

Insights

The RASSF1A tumor suppressor is silenced in many cancers, while the related RASSF1C oncogene is not, despite arising from the same gene. This study explores the reasons for this difference and its clinical relevance in cancer development.

Area of Science:

  • Molecular biology
  • Cancer research
  • Genetics

Background:

  • The RASSF1 gene encodes two distinct proteins, RASSF1A and RASSF1C.
  • RASSF1A functions as a tumor suppressor, frequently inactivated in various cancers.
  • RASSF1C appears to have oncogenic properties and its expression is generally unaffected in cancer.

Purpose of the Study:

  • To investigate the molecular mechanisms underlying the opposing roles of RASSF1A and RASSF1C in carcinogenesis.
  • To elucidate why RASSF1A is silenced while RASSF1C remains unaffected in cancer.
  • To highlight the distinct clinical implications of RASSF1A and RASSF1C in cancer patients.

Main Methods:

  • Comparative analysis of RASSF1A and RASSF1C expression patterns in cancer cell lines and patient tumors.
  • Investigating epigenetic modifications and regulatory elements affecting RASSF1 gene expression.
  • Functional assays to assess the oncogenic or tumor-suppressive activities of RASSF1A and RASSF1C.

Main Results:

  • Differential regulation of RASSF1A and RASSF1C expression due to distinct promoter activities or post-transcriptional modifications.
  • Identification of specific molecular pathways targeted by RASSF1A for tumor suppression.
  • Evidence suggesting RASSF1C contributes to cancer progression through alternative mechanisms.

Conclusions:

  • The opposing functions of RASSF1A and RASSF1C stem from differential gene regulation and distinct biological activities.
  • Understanding these differences is crucial for developing targeted cancer therapies.
  • RASSF1A inactivation represents a significant event in tumorigenesis, while RASSF1C may serve as a potential therapeutic target or biomarker.
Keywords:
C1 domainRASSF1ARASSF1Ccarcinogenesiscell homeostasis

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