Crohn's disease antibody-binding peptide and method of...

C - Chemistry – Metallurgy – 07 – K

Patent

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C07K 7/06 (2006.01) C07K 7/08 (2006.01) C07K 14/415 (2006.01) C07K 14/47 (2006.01) G01N 33/53 (2006.01) G01N 33/564 (2006.01)

Patent

CA 2445309

Examination reagents useful in diagnosing Crohn's disease and a method of conveniently and accurately detecting the occurrence of Crohn's disease. The examination reagents contain as the active ingredient a Crohn's disease antibody-binding protein as defined in the following (a) or (b): (a) a peptide having an amino acid sequence selected from among the amino acid sequences represented by SEQ ID NOS:1 to 4; and (b) a peptide having an amino acid sequence derived from the above-described amino sequence by substitution, deletion or addition of one to several amino acids and being capable of binding to the Crohn's disease antibody. The examination method can be carried out by detecting the presence/absence of an antibody recognizing human vacuolar H+-transport ATPase, a human nuclear protein (Homo Sapiens kruppel- like zinc finger protein 300) or rice allergen in a biological sample of a subject.

L'invention concerne des réactifs d'examen utilisés dans le diagnostic de la maladie de Crohn et une méthode de détection appropriée et adéquate de l'occurrence de la maladie de Crohn. Ces réactifs contiennent, comme ingrédient actif, une protéine de liaison à des anticorps de la maladie de Crohn contenant (a) un peptide doté d'une séquence d'acides aminés sélectionnée parmi les séquences d'acides aminés représentées par SEQ ID NOS : 1 à 4 et (b) un peptide doté d'une séquence d'acides aminés dérivée de la séquence susmentionnée par substitution, délétion ou addition d'un des divers acides aminés, ledit peptide étant capable de se lier à l'anticorps de la maladie de Crohn. On réalise cette méthode d'examen en détectant la présence ou l'absence d'un anticorps reconnaissant l'ATPase du transport d'ions H?+¿ vacuolaire humain, d'une protéine nucléaire humaine (protéine en doigt de gant similaire à au gène kruppel d'Homo sapiens) ou d'un allergène du riz dans un échantillon biologique d'un sujet.

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