The synthesis of polyamide-oligonucleotide conjugate molecules

We have developed methods for the synthesis of peptide-oligodeoxyribonucleotide conjugate molecules in particular, and polyamide-oligonucleotide conjugates in general. Synthesis is carried out by a solid-phase procedure and involves the assembly of a polyamide on the solid support, conversion of the terminal amino group to a protected primary aliphatic hydroxy group by reaction with α,ω-hydroxycarboxylic acid derivatives, and finally oligonucleotide synthesis using phosphoramidite chemistry. The conjugate molecules can be used as DNA probes, with the polyamide component carrying one or more non-radioactive markers. These conjugates also have the potential to be used as anti-sense inhibitors of gene expression, with the peptide segment acting as a targeting moiety.