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Choosing the right antisense oligonucleotide (ASO) is crucial for bacterial gene regulation. Cellular uptake, not RNA binding affinity, primarily determines ASO effectiveness in bacteria, with PNA and PMO showing the most promise.

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Biochemistry

Background:

  • Antisense oligonucleotides (ASOs) offer sequence-specific gene regulation in bacteria.
  • Various ASO modifications exist with differing RNA binding affinities and cellular uptake efficiencies.
  • A comprehensive comparison of these ASOs in bacterial systems is lacking.

Purpose of the Study:

  • To evaluate the efficiency of different antisense oligomers in blocking gene expression in *E. coli*.
  • To investigate the correlation between ASO properties (uptake, binding affinity) and gene silencing efficacy.
  • To identify key factors influencing ASO performance in bacterial antisense inhibition.

Main Methods:

  • Utilized fluorescein (FAM)-labeled antisense oligomers (ASOs) for bacterial uptake studies.
  • Employed flow cytometry to quantify cellular uptake of different ASO types.
  • Performed thermal denaturation (Tm) and isothermal titration calorimetry (ITC) to assess ASO:RNA binding affinities.
  • Conducted cell-free translation assays to measure gene expression inhibition.
  • Investigated the impact of membrane-active compounds on ASO uptake.

Main Results:

  • Significant differences in bacterial uptake were observed, with peptidic nucleic acid (PNA), phosphorodiamidate morpholino oligonucleotide (PMO), and phosphorothioate (PS) oligomers showing high fluorescence, while phosphodiester (PO) oligomers showed low uptake.
  • A good correlation exists between Tm and Kd values for ASO:RNA duplexes, but no correlation was found between Kd and reduced β-Gal activity in bacterial cells.
  • Cell-free assays revealed a direct relationship between Kd and gene expression inhibition, with LNA oligomers being most efficient.
  • Membrane-active compounds enhanced the cellular uptake of FAM-PNA and FAM-PS oligomers.
  • PNA and PMO demonstrated superior cellular uptake and β-Gal activity reduction compared to PS and PO oligomers.

Conclusions:

  • Cellular uptake is the primary determinant of ASO efficacy for bacterial antisense inhibition.
  • RNA binding affinity is critical for gene expression inhibition in cell-free systems but not in whole bacterial cells.
  • PNA and PMO are the most effective ASOs for bacterial gene silencing due to their efficient cellular uptake.