Diagnostic test for alzheimer's disease

C - Chemistry – Metallurgy – 12 – Q

Patent

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Details

C12Q 1/46 (2006.01) C12N 9/16 (2006.01) C12N 9/18 (2006.01) G01N 33/573 (2006.01) G01N 33/68 (2006.01)

Patent

CA 2304949

A method for the diagnosis of Alzheimer's disease (AD) in a patient, comprising the steps of: (1) providing a sample of an appropriate body fluid from said patient; (2) detecting the presence of acetylcholinesterase (AChE) with an altered glycosylation pattern in said sample. It has been established that approximately 75-95 % of the AChE in the CSF of AD patients binds to Concanavalin (Con A) or wheat germ agglutinin (WGA) but with different specificity to each. Accordingly, in order to identify the glycosylation pattern of AChE in the sample, the binding to Con A is determined, then the binding to WGA is determined, and a ratio calculated. The ratio is characteristic of the glycosylation pattern. In an alternative embodiment of the invention a monoclonal antibody specific for AChE with an altered glycosylation pattern is used to detect its presence.

Technique permettant de diagnostiquer la maladie d'Alzheimer chez un patient, qui comprend les étapes suivantes: (1) on prélève un échantillon de liquide corporel approprié chez ledit patient; (2) on détecte dans ledit échantillon la présence d'acétylcholinestérase (AChE) possédant un motif de glycosylation modifié. Il a été établi qu'environ 75-95 % de l'AChE se trouvant dans le LCR des patients atteints de maladie d'Alzheimer se lie à la concanavaline (Con A) ou à l'agglutinine des germes de blé (WGA), mais avec une spécificité différente pour chacun d'eux. Afin d'identifier le motif de glycosylation de l'AChE dans l'échantillon, on détermine sa liaison avec Con A, puis sa liaison avec WGA, et on calcule un rapport. Celui-ci est caractéristique du motif de glycosylation. Dans un autre mode de réalisation de l'invention, on utilise un anticorps monoclonal spécifique de l'AChE possédant un motif de glycosylation modifié afin de détecter sa présence.

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