Targeted and regional cellular ablation in zebrafish

A - Human Necessities – 01 – K

Patent

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A01K 67/027 (2006.01)

Patent

CA 2519071

A system including: (i) a methodology for targeted cellular ablation in zebrafish; (ii) a methodology for regional cellular ablation in zebrafish. These methodologies are used to identify genetic components that regulate cellular regeneration and to identify drug compounds that influence cellular regeneration for the purpose of developing therapies for degenerative conditions. Transgenic zebrafish disclosed herein contain transgenic constructs composed of: (i) cell and/or tissue-type specific regulatory elements (e.g. promoter and/or enhancer regions) which delimit expression of operably linked gene product(s) to discrete cellular populations; (ii) a gene product that promotes cellular ablation composed of a pro-drug conversion system capable of converting nontoxic pro-drugs, which is expressed alone or in connection with; (iii) a reporter gene product that allows selective detection of cells expressing the reporter -both prior to (initial cells) and following cellular ablation (regenerated cell). Here we describe genetic delivery of a pro-drug converting system in order to enable targeted cellular ablation in zebrafish. Transgenic zebrafish of this invention provide a high- throughput system for genetic dissection of the process of cellular regeneration and, compound screening for the discovery of drugs capable of promoting cellular regeneration.

L'invention porte sur un système comportant: (i) une méthode d'ablation cellulaire ciblée dans un poisson zèbre; (ii) une méthode d'ablation cellulaire régionale dans un poisson zèbre. Ces méthodes servent à identifier les éléments génétiques régulant la régénération cellulaire et des médicaments agissant sur la régénération cellulaire en vue de la mise au point de thérapies combattant les troubles dégénératifs. Le poisson zèbre de l'invention contient des chimères transgéniques comportant: (i) des éléments régulateurs spécifiques du type cellule et/ou tissu (par exemple des régions promotrices et/ou amplificatrices) qui délimitent l'expression de produits géniques fonctionnellement liés à des populations de cellules discrètes; un produit génique promoteur d'ablation cellulaire composé d'un système de conversion de prodrogue capable de convertir des promédicaments non toxiques, et qui est exprimé seul ou en association avec (iii) un gène reporter permettant de détecter sélectivement l'expression de cellules exprimant le reporter avant (cellules initiales) et après (cellules régénérées) l'ablation cellulaire. L'invention porte également sur l'élaboration génétique d'un système de conversion de prodrogues permettant l'ablation de cellules ciblées chez le poisson zèbre. Le poisson zèbre de l'invention constitue un système à fort rendement d'analyse du processus de régénération cellulaire et de criblage de composés en vue de la découverte de médicaments susceptibles de promouvoir la regénération cellulaire.

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