Hybrid operon for expression of colonization factor (cf)...

C - Chemistry – Metallurgy – 12 – N

Patent

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C12N 15/70 (2006.01) A61K 39/02 (2006.01)

Patent

CA 2691962

A recombinant operon comprising a gene assembly wherein there are at least two structural genes coding for at least two major subunits of colonization factor antigens (CFs) associated with enterotoxigenic Escherichia coli bacteria (ETEC), is disclosed. Further disclosed is a host cell, such as an Escherichia coli cell, genetically engineered to comprise such a recombinant operon, wherein said operon is located on an episomal element, such as a plasmid, or integrated in the chromosome of said host cell. Also disclosed is a method of producing a host cell capable of expressing from said operon at least two major subunits of colonization factor antigens (CFs) associated with enterotoxigenic Escherichia coli bacteria (ETEC). In addition, a vaccine composition against diarrhea comprising at least one such host cell together with pharmaceutically acceptable excipients, buffers, and/or diluents is disclosed. Finally is disclosed the use of said operon in the production of such a vaccine.

L'invention concerne un opéron recombinant comprenant un ensemble de gènes dans lequel se trouvent au moins deux gènes structuraux codant pour au moins deux sous-unités majeures d'antigènes du facteur de colonisation (CF) associés aux bactéries d'Escherichia coli entérotoxinogènes (ETEC). L'invention concerne en outre une cellule hôte, telle qu'une cellule d'Escherichia coli, génétiquement modifiée pour comprendre un tel opéron recombinant, ledit opéron étant situé sur un élément épisomal, tel qu'un plasmide, ou intégré dans le chromosome de ladite cellule hôte. L'invention concerne également un procédé de production d'une cellule hôte capable d'exprimer à partir dudit opéron au moins deux sous-unités majeures d'antigènes du facteur de colonisation (CF) associés à des bactéries d'Escherichia coli entérotoxinogènes (ETEC). De plus, l'invention concerne une composition de vaccin contre la diarrhée comprenant au moins une telle cellule hôte conjointement avec des excipients, tampons et/ou diluants pharmaceutiquement acceptables. Enfin, l'invention concerne l'utilisation dudit opéron dans la production d'un tel vaccin.

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