Probe, nucleic acid sequences, method particularly suitable...

C - Chemistry – Metallurgy – 12 – Q

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C12Q 1/68 (2006.01) A61K 31/70 (2006.01) C07H 21/00 (2006.01)

Patent

CA 2218761

The detection and characterisation of yeasts, particularly those of medical and industrial interest, is disclosed. The aim is to provide powerful, reliable and simply and reproducibly usable DNA probes specific for numerous yeasts. For this purpose, among others, a yeast-specific and/or -infraspecific detection probe is provided which consists of at least one part of at least one DNA and/or RNA fragment F from rDNA that does not code for rRNA synthesis and is located in the IGR (rDNA 25S and rDNA 18S). This iterative rDNA includes at least two repeated subsequences with a mutual homology of >/= 50 %. A detection method using said probe, as well as nucleic acid sequences capable of being included in the probe, are also disclosed. Said probe is useful for detecting/identifying yeast (e.g. C. krusei, G. candidum), as an epidemiological marker or strain tracer, and in anti-yeast therapy.

Le domaine de l'invention est celui de la détection et la caractérisation de levures notamment celles d'intérêt médical et industriel. Le but visé par l'invention est la fourniture de sondes nucléiques spécifiques de nombreuses levures, et par ailleurs performantes, fiables et utilisables de manière simple et reproductible. Pour satisfaire à ce but parmi d'autres, l'invention propose ainsi une sonde de détection spécifique et/ou infraspécifique de levure, caractérisée en ce qu'elle est constituée par au moins une partie d'au moins un fragment F d'ADN et/ou d'ARN provenant d'ADNr qui ne code pas pour la synthèse d'ARNr et qui est localisé dans l'IGR (ADNr 25S et ADNr 18S). Cet ADNr est de type itératif comprend au moins deux sous-séquences répétées, avec une homologie entre sous-séquences >= à 50 %. L'invention concerne en outre un procédé de détection mettant en oeuvre cette sonde, ainsi que des séquences nucléiques susceptibles d'être incluses dans la sonde. Applicaton: détection/identification de levure (C.krusei, G.candiduml) par exemple, marqueur épidémiologique, traceur de souches, thérapeutique anti-levures.

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