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Related Experiment Videos

Systemically delivered antisense oligomers upregulate gene expression in mouse tissues.

Peter Sazani1, Federica Gemignani, Shin-Hong Kang

  • 1Lineberger Comprehensive Cancer Center, University of North Carolina, Chapel Hill, NC 27599, USA.

Nature Biotechnology
|November 12, 2002
PubMed
Summary

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Systemically delivered peptide nucleic acid with four lysines (PNA-4K) oligomers show potent antisense activity in mouse organs. This confirms PNA-4K

Area of Science:

  • Oligonucleotide therapeutics
  • Gene therapy
  • Molecular biology

Background:

  • Antisense oligomers are a promising therapeutic modality.
  • Delivery and efficacy of antisense oligomers in vivo remain challenges.
  • Peptide nucleic acid (PNA) oligomers offer unique structural properties.

Purpose of the Study:

  • To evaluate the in vivo antisense activity of modified oligonucleotides.
  • To determine the role of PNA oligomer structure in therapeutic efficacy.
  • To validate a transgenic mouse model for assessing oligonucleotide performance.

Main Methods:

  • Systemic injection of various antisense oligomers (2'-O-MOE, PNA-4K, PNA-1K, Morpholino) in a transgenic mouse model.
  • Assessment of oligonucleotide delivery, distribution, and sequence-specific gene modulation.

Related Experiment Videos

  • Quantification of enhanced green fluorescence protein (EGFP) expression as a readout for restored gene splicing.

    • Main Results:

    • 2'-O-MOE and PNA-4K oligomers demonstrated significant sequence-specific antisense activity in multiple mouse organs.
    • Morpholino oligomers showed reduced efficacy, while PNA-1K oligomers were inactive.
    • The four-lysine tail on PNA oligomers was essential for in vivo antisense activity.
    • Restored EGFP-654 expression confirmed successful splice-site targeting and gene modulation.

    Conclusions:

    • Systemically delivered PNA-4K oligomers exhibit potent, sequence-specific antisense activity in vivo.
    • The PNA four-lysine tail is critical for achieving therapeutic efficacy.
    • These findings validate chemically modified oligonucleotides as potential therapeutics for genetic disorders.