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5-azacytidine inhibits nonsense-mediated decay in a MYC-dependent fashion

Madhuri Bhuvanagiri1, Joe Lewis2, Kerstin Putzker2

  • 1Molecular Medicine Partnership Unit, European Molecular Biology Laboratory, University of Heidelberg, Heidelberg, Germany Department of Pediatric Oncology, Hematology and Immunology, University of Heidelberg, Heidelberg, Germany European Molecular Biology Laboratory, Heidelberg, Germany.

EMBO Molecular Medicine
|October 17, 2014
PubMed

Insights

5-azacytidine inhibits nonsense-mediated RNA decay (NMD), a process that removes faulty transcripts. This drug upregulates gene expression and may offer new treatments for genetic diseases caused by premature stop codons.

Area of Science:

  • Molecular Biology
  • Genetics
  • Pharmacology

Background:

  • Nonsense-mediated RNA decay (NMD) is a crucial cellular surveillance pathway that degrades messenger RNAs containing premature translation termination codons (PTCs).
  • PTCs arise from mutations in approximately one-third of inherited genetic disorders and some cancers, influencing disease severity.
  • 5-azacytidine is an FDA-approved drug for myelodysplastic syndrome and myeloid leukemia, acting as a cytidine analogue.

Purpose of the Study:

  • To investigate the effect of 5-azacytidine on NMD activity.
  • To determine the molecular mechanisms underlying 5-azacytidine's impact on NMD.
  • To explore the potential therapeutic applications of 5-azacytidine for PTC-related genetic diseases.

Main Methods:

  • Dose-dependent treatment of cells with 5-azacytidine.
  • Quantitative analysis of NMD target gene expression.
  • Investigation of MYC gene expression levels and its role in NMD modulation.

Main Results:

  • 5-azacytidine demonstrated a dose-dependent inhibition of NMD.
  • The drug specifically upregulated the expression of both mutant PTC-containing transcripts and endogenous NMD targets.
  • This NMD inhibition was dependent on the induction of MYC expression, linking 5-azacytidine's action to MYC signaling pathways.
  • Effective cellular concentrations of 5-azacytidine align with therapeutic levels used in patients.

Conclusions:

  • 5-azacytidine effectively inhibits NMD through MYC induction.
  • The drug's ability to upregulate PTC-containing transcripts suggests potential for treating genetic disorders caused by PTC mutations.
  • 5-azacytidine represents a promising candidate for drug repurposing in Mendelian and acquired genetic diseases associated with PTCs.
Keywords:
5‐azacytidineMYCnonsense‐mediated decaypremature termination codons

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