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RNA-Based Therapy Utilizing Oculopharyngeal Muscular Dystrophy Transcript Knockdown and Replacement.

Aida Abu-Baker1, Nawwaf Kharma2, Jonathan Perreault3

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Molecular Therapy. Nucleic Acids
|March 5, 2019
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Summary
This summary is machine-generated.

RNA replacement therapy shows promise for Oculopharyngeal Muscular Dystrophy (OPMD). Researchers developed microRNAs and ribozymes to reduce PABPN1 expression, restoring protein levels and improving cell and worm models of OPMD.

Keywords:
OPMDPABPN1RNA replacement therapymicroRNAspolyalanine disordersribozymes

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Area of Science:

  • Molecular Biology
  • Genetics
  • RNA Therapeutics

Background:

  • Oculopharyngeal Muscular Dystrophy (OPMD) is a genetic disorder caused by polyalanine tract expansions in the PABPN1 protein.
  • Currently, no effective treatments exist for OPMD, highlighting an urgent need for therapeutic strategies.

Purpose of the Study:

  • To investigate the potential of RNA-based therapies, specifically microRNAs (miRNAs) and hammerhead ribozymes (hhRzs), for treating OPMD.
  • To develop a strategy to selectively target and reduce the expression of the mutant PABPN1 protein while preserving the wild-type.

Main Methods:

  • Development of selective miRNAs and hhRzs targeting PABPN1 mRNA and protein.
  • Design of an optimized-codon wild-type PABPN1 (opt-PABPN1) resistant to miRNA and hhRz cleavage.
  • Testing the efficacy of the RNA-based strategy in cell (C2C12) and C. elegans OPMD models.

Main Results:

  • miRNAs and hhRzs reduced PABPN1 mRNA and protein levels by up to 90% in OPMD models.
  • Co-expression of opt-PABPN1 with miRNAs or hhRzs restored PABPN1 levels and reduced cell death in a C2C12 OPMD model.
  • Knockdown of PABPN1 in C. elegans OPMD models significantly improved worm motility.

Conclusions:

  • RNA replacement therapy, utilizing miRNAs and hhRzs, demonstrates significant therapeutic potential for OPMD.
  • The developed strategy effectively reduces mutant PABPN1 expression and alleviates OPMD-associated pathology in preclinical models.
  • This approach offers a promising new avenue for OPMD treatment.