Dna fragments, primers, kits, and methods for amplification...

C - Chemistry – Metallurgy – 12 – N

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C12N 15/09 (2006.01)

Patent

CA 2608742

The present invention describes a novel molecular method based on the polimerase chain reaction (PCR) in a multiplex variant in order to detect and identify Candida species with clinical relevance, namely C. albicans, C. glabrata, C. krusei, C. parapsilosis, C. tropicalis, C. guilliermondii, C. lusitaniae e C. dubliniensis. The strategy uses the existence of sequences, whether conserved or variable, in fungal ribosomal genes and in the use of a combination of universal primers, specific for fungi, and internal primers, specific for each one of the Candida species (Figure 1). In this sense, two fragments from the internal transcribed spacer (ITS) regions of the ribosomal RNA (rRNA) are amplified by multiplex PCR, allowing the easy identification of the Candida species in question. This methodology allows a rapid, effective and low-cost identification of Candida species with clinical relevance, bearing several advantages over the currently available diagnostic methods.

La présente invention concerne une nouvelle méthode moléculaire fondée sur la réaction en chaîne de la polymérase (PCR) dans un variant multiplex qui permet de détecter et d'identifier des espèces Candida pertinentes du point de vue clinique, plus précisément C. albicans, glabrata, C. krusei, C. parapsilosis, C. tropicalis, C. guilliermondii, C. lusitaniae e C. dubliniensis. La stratégie repose sur l'existence de séquences, du type conservé ou variable, dans des gènes de ribosome fongique et sur l'utilisation d'une combinaison d'amorces universelles, spécifiques des champignons, et d'amorces internes, spécifiques de chacune des espèces Candida (Figure 1). De cette manière, deux fragments provenant des régions d'espaceur transcrit interne (ITS) de l'ARN ribosomique (ARNn) sont amplifiés par PCR multiplex, ce qui permet d'identifier plus facilement les espèces Candida concernées. Cette méthodologie permet d'effectuer une identification rapide, efficace et peu coûteuse des espèces Candida pertinentes dupoint de vue clinique, ce qui présente plusieurs avantages par rapport aux méthodes de diagnostic existant actuellement.

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