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Enhancing mRNA translation efficiency by introducing sequence optimized AU-rich elements in 3' UTR via HuR anchorage.

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Researchers optimized messenger RNA (mRNA) by inserting adenylate/uridylate-rich elements (AU-rich elements) into the untranslated region. This strategy enhances mRNA stability and protein expression, paving the way for advanced mRNA therapeutics.

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3′ UTR rational designAU-rich elementsHuRMT: Oligonucleotides: Therapies and ApplicationsRNA stabilityRNA-binding proteinsmRNA vaccinessequence optimization

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Area of Science:

  • Molecular Biology
  • Biotechnology
  • RNA Therapeutics

Background:

  • Messenger RNA (mRNA) technology offers significant therapeutic potential but faces limitations in cellular stability and protein expression.
  • Optimizing mRNA sequences is crucial for overcoming these challenges and realizing the full therapeutic promise of mRNA.

Purpose of the Study:

  • To develop a novel strategy for enhancing mRNA stability and protein expression using AU-rich elements (AREs).
  • To investigate the role of the RNA-binding protein Human antigen R (HuR) in mediating the effects of AREs on mRNA.

Main Methods:

  • Integration of natural and engineered AU-rich elements (AREs) into the 3' untranslated region (3' UTR) of mRNA constructs.
  • Assessment of RNA stability and protein expression (luciferase, EGFP, mCherry, ovalbumin) with varying ARE sequences and insertion sites.
  • HuR knockdown experiments and pull-down assays to confirm the interaction between AREs and HuR.

Main Results:

  • Insertion of AREs between the open reading frame (ORF) and 3' UTR significantly enhanced RNA stability.
  • Cytoplasmic HuR was identified as a key protein promoting mRNA stability and translation via interaction with AREs.
  • Engineered AREs, particularly those containing "AUUUA" repeats, increased protein expression up to 5-fold.
  • The enhancing effect of AREs was demonstrated across multiple coding proteins, confirming their universality.

Conclusions:

  • Leveraging AREs and RNA-binding proteins like HuR offers a potent strategy to improve mRNA pharmacokinetics.
  • This approach enhances cytoplasmic mRNA stability and translation, broadening the therapeutic applications of mRNA technology.