Peptide Conjugates for Chromosomal Gene Targeting by Triplex-forming Oligonucleotides

Overview

Journal Nucleic Acids Res

Publisher Oxford University Press

Specialty Biochemistry

Date 2004 Dec 17

PMID 15602001

Citations 17

Authors

Faye A Rogers

Muthiah Manoharan

Peter Rabinovitch

David C Ward

Peter M Glazer

Affiliations

Soon will be listed here.

Abstract

Triplex-forming oligonucleotides (TFOs) are DNA-binding molecules, which offer the potential to selectively modulate gene expression. However, the biological activity of TFOs as potential antigene compounds has been limited by cellular uptake. Here, we investigate the effect of cell-penetrating peptides on the biological activity of TFOs as measured in an assay for gene-targeted mutagenesis. Using the transport peptide derived from the third helix of the homeodomain of antennapedia (Antp), we tested TFO-peptide conjugates compared with unmodified TFOs. TFOs covalently linked to Antp resulted in a 20-fold increase in mutation frequency when compared with 'naked' oligonucleotides. There was no increase above background in mutation frequency when Antp by itself was added to the cells or when Antp was linked to mixed or scrambled sequence control oligonucleotides. In addition, the TFO-peptide conjugates increased the mutation frequency of the target gene, and not the control gene, in a dose-responsive manner. Confocal microscopy using labeled oligonucleotides indicated increased cellular uptake of TFOs when linked to Antp, consistent with the gene-targeting data. These results suggest that peptide conjugation may enhance intranuclear delivery of reagents designed to bind to chromosomal DNA.

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