Synthesis and application of new amino modification analogues for functional oligonucleotide.

We synthesized new analogues to functionalize oligonucleotides. These analogues included a primary amino group tethering to an aromatic ring, and we introduced them into the 5'-end of each oligonucleotide. The oligonucleotides with the aromatic amino group (OAA) were easily purified from impurities by using their hydrophobic property of the aromatic residue. These OAA probes reacted with activated ester groups more efficiently than the conventional probe, which was modified with 6-aminohexyl group. Furthermore, we applied these OAAs to oligonucleotide array probes. The OAA probes were efficiently immobilized on the array surface, and the hybridization intensity on these probes increased as compared with the conventional probes. These new probes can be a new nucleic acid tool for biological assay systems.