Method for rapid typification of microorganisms by pulse...

C - Chemistry – Metallurgy – 12 – Q

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C12Q 1/68 (2006.01) C12N 1/06 (2006.01) G01N 27/447 (2006.01)

Patent

CA 2428313

Disclosed is a method for rapidly typifying yeasts, parasites and bacteria. The method involves the following steps: a) Preparing intact and immobilized DNA within 5 to 60 minutes by means of a method which uses a set of reagents that only contains a buffer solution, a detergent, a chelating agent and an agent that breaks up the hydrogen bridges. b) Separating intact DNA molecules or their restriction fragments using pulsed field electrophoresis mini- equipment of systems CHEF (Contour Clamped Homogeneous Electric Field) and TAFE (Transversal Alternating Field Electrophoresis) for time periods ranging between 2.5 and 7 hours. c) Selecting the optimal conditions that will be applied in the miniCHEF by using a method simulating a priori the electrophoretic patterns that would be obtained in said gels. d) Providing the reorientation times, migration speeds and molecule sizes without using size markers but using a method that analyzes migrated distances.

L'invention concerne un procédé de caractérisation rapide de levures, de parasites et de bactéries. Ce procédé consiste a) à préparer, dans un laps de temps compris entre 5 et 60 minutes, un ADN intact et immobilisé selon une méthode utilisant un jeu de réactifs contenant uniquement une solution tampon, un détergent, un agent chélatant et un agent rompant les liaisons hydrogène, b) à séparer les molécules d'ADN intactes ou leurs fragments de restriction à l'aide des mini-équipements d'électrophorèse en champs pulsés des systèmes CHEF (champs alternés homogènes fixés) et TAFE (Transversal Alternating Field Electrophoresis) durant des laps de temps compris entre 2,5 et 7 heures, c) à sélectionner les conditions optimales à appliquer dans le système miniCHEF à l'aide d'une méthode permettant de simuler, <i>a priori</i>, les diagrammes électrophorétiques pouvant être obtenus dans lesdits gels, d) à appliquer les temps de réorientation, les vitesses de migration et les dimensions des molécules sans utiliser de marqueurs de tailles, et à utiliser une méthode permettant d'analyser les distances de migration.

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