Peptide-based delivery of steric-block PNA oligonucleotides

Area of Science:

• Molecular Biology
• Biochemistry
• Drug Delivery

Background:

• Synthetic oligonucleotides (ON) are explored for gene expression control.
• In vivo delivery of ON remains a significant challenge for therapeutic applications.
• Steric-block neutral DNA mimics like PNA and PMO offer potential for sequence-specific targeting.

Purpose of the Study:

• To present a novel delivery strategy for synthetic oligonucleotides using cell-penetrating peptides (CPP).
• To demonstrate the utility of CPP-conjugated DNA mimics (PNA, PMO) for sequence-specific pre-mRNA splicing modulation.
• To describe methods for chemical synthesis, cellular uptake monitoring, and splicing correction assays.

Main Methods:

• Chemical synthesis of CPP-oligonucleotide conjugates.
• Methodologies for assessing cellular uptake of the conjugates.
• Development of an assay to evaluate splicing correction efficiency.

Main Results:

• Successful conjugation of steric-block neutral DNA mimics (PNA, PMO) with CPPs.
• Demonstration of effective cellular uptake of CPP conjugates.
• Validation of the assay for monitoring splicing modulation and efficiency.

Conclusions:

• CPP-oligonucleotide conjugates represent a viable strategy to overcome delivery barriers for ON-based gene modulation.
• This approach enables sequence-specific interference with pre-mRNA splicing.
• The described methodologies facilitate research and therapeutic development in gene regulation.