Branched and multi-chain nucleic acid switches for sensing...

C - Chemistry – Metallurgy – 12 – Q

Patent

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C12Q 1/68 (2006.01)

Patent

CA 2576511

Embodiments of the invention relate to a branched or multichain nucleic acid switch adapted to switch from a first conformation to a second conformation upon ligand binding. The switch includes a probe strand, P, which includes the ligand binding domain; a switching framework which includes a cover strand (C), and a tether that holds P and C together and a signaling apparatus. Some embodiments include a toggle strand (T) where now the tether holds P, C, T, and the signaling apparatus together. As the switch changes between the first and second conformations; the signaling apparatus reports the state of the switch. The signaling entity is typically a lumiphore and a quencher located along the switching framework. Nucleic acid switches have applications in real time assays for diverse agents including infectious agents, environmental toxins, and terrorist agents, as well as screening' methods for such agents. Further applications are found for nanoelectronics, nanofabrication and nanomachines.

L'invention concerne un échange d'acides nucléiques multichaîne ou ramifiés conçu pour passer d'une première conformation à un seconde conformation après liaison avec un ligand. Le changement comprend un brin de sonde, P, qui comprend le domaine de liaison du ligand; une structure d'échange qui comprend un brin de couverture (C) et un téter qui supporte P et C ensemble ainsi qu'un appareil de signalisation. L'invention concerne en outre un brin en barrette (T) où le téter maintient P, C, T et l'appareil de signalisation ensemble. Alors que l'échange se modifie ente la première et la seconde conformation, l'appareil de signalisation informe sur l'état de l'échange. L'entité de signalisation est normalement un lumiphore et un désactiveur placé le long de la structure d'échange. Les échanges d'acides nucléiques trouvent des applications dans des essais en temps réel pour différents agents, y compris les agents infectieux, les toxines environnementales et les agents terroristes, ainsi que les procédés de dépistage pour de tels agents. D'autres applications sont prévues dans le secteur nanoélectrique, la nanofabrication et les nanomachines.

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