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Decoding mRNA translatability and stability from the 5' UTR.

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Researchers engineered over a million 5' untranslated region (UTR) variants to decode regulatory elements controlling protein synthesis. They discovered sequences influencing mRNA stability and translation, revealing new surveillance pathways.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • Engineering sequence elements in 5' untranslated regions (5' UTRs) is crucial for controlling protein synthesis but remains challenging.
  • Understanding the cis-regulatory code within 5' UTRs is essential for advancing gene expression control.

Purpose of the Study:

  • To systematically investigate the impact of diverse 5' UTR sequences on mRNA translatability and stability.
  • To identify specific sequence elements and their roles in regulating gene expression.
  • To uncover novel mRNA surveillance pathways.

Main Methods:

  • Development of a synthetic messenger RNA library with over one million randomized 5' UTR variants.
  • Utilizing massively parallel reporter assays to measure translational output and mRNA stability.
  • Employing genetic approaches to investigate UPF1-dependent and ribosome-independent pathways.

Main Results:

  • A randomized 10-nucleotide sequence preceding an upstream open reading frame (uORF) significantly impacts translational output and mRNA stability.
  • Efficient mRNA translation correlates with increased mRNA stability, while uORF translation triggers UPF1-dependent mRNA decay.
  • G-quadruplexes act as translational inhibitors marking mRNAs for decay in P-bodies.
  • An unstructured, A-rich element destabilizes mRNA independently of translation but facilitates cap-independent translation.

Conclusions:

  • Identified diverse 5' UTR sequence features that precisely control mRNA translatability and stability.
  • Revealed both ribosome-dependent and ribosome-independent mRNA surveillance mechanisms.
  • Provided insights into the complex regulatory code governing gene expression at the post-transcriptional level.