Generation of stable mRNA fragments and translation of N-truncated proteins induced by antisense

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Sequence-specific and Selective Recognition of Double-stranded RNAs over Single-stranded RNAs by Chemically Modified Peptide Nucleic Acids
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Sequence-specific and Selective Recognition of Double-stranded RNAs over Single-stranded RNAs by Chemically Modified Peptide Nucleic Acids

Published on: September 21, 2017

C Thoma1, P Hasselblatt, J Köck

  • 1Department of Medicine II, University of Freiburg, Hugstetter Strasse 55, D-79106 Freiburg, Germany.

Molecular Cell
|October 31, 2001
PubMed

Insights

Antisense oligodeoxynucleotides (AS ODNs) cleave target mRNAs, leading to 5' fragment degradation and translation of N-terminally truncated proteins. These truncated proteins can have significant biological effects.

Area of Science:

  • Molecular Biology
  • RNA Therapeutics
  • Gene Regulation

Background:

  • Antisense oligodeoxynucleotides (AS ODNs) are widely used to modulate gene expression.
  • Current understanding suggests AS ODNs primarily function by degrading target mRNA or inhibiting translation.

Purpose of the Study:

  • To investigate the precise mechanism of action for phosphorothioate-modified AS ODNs.
  • To explore the functional consequences of AS ODN-induced mRNA cleavage.

Main Methods:

  • Analysis of mRNA cleavage products after AS ODN treatment.
  • Assessment of 5' cap structures and poly(A) tail lengths of mRNA fragments.
  • Evaluation of protein translation from cleaved mRNA fragments using various reporter systems.

Main Results:

  • Demonstrated direct cleavage of target mRNAs within the AS ODN binding site.
  • Observed degradation of the 5' mRNA fragment, while the 3' fragment remained intact.
  • Showed that 3' mRNA fragments were translated into N-terminally truncated proteins, impacting protein function and localization.

Conclusions:

  • AS ODN treatment can lead to mRNA cleavage and subsequent synthesis of biologically active, N-terminally truncated proteins.
  • This mechanism represents a novel mode of action for AS ODNs beyond simple degradation or translation blocking.
  • The generation of truncated proteins may have significant implications for therapeutic applications of AS ODNs.

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