System for real time detection of nucleic acid amplification...

C - Chemistry – Metallurgy – 12 – Q

Patent

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Details

C12Q 1/68 (2006.01) C12M 1/34 (2006.01) C12M 1/40 (2006.01) G01J 3/28 (2006.01) G01N 21/03 (2006.01) G01N 21/64 (2006.01) G01N 21/77 (2006.01)

Patent

CA 2159830

A system is provided for carrying out real time fluorescence-based measurements of nucleic acid amplification products. In a preferred embodiment of the invention, an excitation beam is focused into a reaction mixture through a surface, the reaction mixture containing: (i) a first fluorescent indicator capable of generating a first fluorescent signal whose intensity is proportional to the amount of an amplification product in the volume of the reaction mixture illuminated by the excitation beam and (ii) a second fluorescent indicator homogeneously distributed throughout the reaction mixture capable of generating a second fluorescent signal proportional to the volume of reaction mixture illuminated by the excitation beam. Preferably, the excitation beam is focused into the reaction mixture by a lens through a portion of a wall of a closed reaction chamber containing the reaction mixture. The same lens is used to collect the first and second fluorescent signals generated by the first and second fluorescent indicators, respectively, in response to the excitation beam. The ratio of the fluorescent intensities of the first and second fluorescent signals provides a stable quantitative indicator of the amount of amplification product synthesized in the course of the amplification reaction.

Système destiné à effectuer des mesures en temps réel, basées sur la fluorescence, de produits d'amplification d'acides nucléiques. Dans un mode de réalisation préféré de la présente invention, un faisceau d'excitation est focalisé dans un mélange de réaction à travers une surface, ledit mélange de réaction contenant (i) un premier indicateur fluorescent capable de générer un premier signal fluorescent dont l'intensité est proportionnelle à la quantité de produit d'amplification dans le volume de mélange de réaction illuminé par le faisceau d'excitation, et (ii) un second indicateur fluorescent réparti de manière homogène dans le mélange de réaction capable de générer un second signal fluorescent proportionnel au volume de mélange de réaction illuminé par le faisceau d'excitation. De préférence, le faisceau d'excitation est focalisé dans le mélange de réaction par une lentille à travers une partie d'une paroi d'une chambre de réaction fermée contenant le mélange de réaction. La même lentille est utilisée pour recueillir les premier et second signaux fluorescents générés par les premier et second indicateurs, respectivement, en réponse au faisceau d'excitation. Le rapport des intensités de fluorescence des premier et second signaux fluorescents fournit un indicateur quantitatif stable de la quantité de produit d'amplification synthétisé au cours de la réaction d'amplification.

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