Icea gene and related methods

C - Chemistry – Metallurgy – 12 – N

Patent

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C12N 15/31 (2006.01) A61K 39/106 (2006.01) A61K 39/40 (2006.01) C07H 21/04 (2006.01) C07K 7/06 (2006.01) C07K 14/205 (2006.01) C12Q 1/68 (2006.01) G01N 33/569 (2006.01) A61K 38/00 (2006.01) A61K 39/00 (2006.01)

Patent

CA 2227171

A purified IceA protein of Helicobacter pylori is provided. The protein is expressed as either an IceA 1 or an IceA 2 variant. A purified polypeptide fragment of the IceA protein is also provided. An antigenic fragment of IceA is provided. An isolated nucleic acid that encodes an IceA protein of H. pylori is provided. A nucleic acid that encodes an IceA 1 variant and a nucleic acid that encodes an IceA 2 variant is also provided. Fragments of the IceA gene are provided. A method of detecting the presence of an antibody against H. pylori in a sample is provided. The method comprises the following steps: a) contacting the sample with a purified IceA protein of H. pylori or a H. pylori-specific fragment thereof; and b) detecting the binding of the antibody in the sample to the protein or fragment, the detection of biding indicating the presence in the sample of antibodies against H. pylori. A method of detecting the presence of an antibody against an ulcerative Helicobacter pylori strain in a sample is also provided.

L'invention concerne une protéine IceA purifiée d'helicobacter pylori. Ladite protéine est exprimée sous forme de variant d'IceA 1 ou d'IceA 2. Elle porte sur un fragment polypeptidique purifié de la protéine IceA, ainsi que sur un fragment antigénique d'IceA, sur un acide nucléique isolé qui code une protéine IceA de H. pylori. Elle concerne un acide nucléique qui code un variant d'IceA1 et un acide nucléique cui code un variant d'IceA 2, des fragments du gène d'IceA, un procédé de détection de la présence d'un anticorps dirigé contre H. pylori dans un échantillon. Le procédé consiste à: a) mettre l'échantillon en contact avec une protéine d'iceA purifiée de H. pylori ou un fragment de celle-ci spécifique de H. pylori; et b) à détecter la liaison de l'anticorps dans l'échantillon à ladite protéine ou audit fragment, la détection d'une liaison signalant la présence d'anticorps dirigés contre H. pylori. Un procédé de détection de la présence d'un anticorps dirigé contre une souche d'helicobacter pylori ulcéreuse dans un échantillon est également décrit.

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