Alteration of tobacco alkaloid content through modification...

C - Chemistry – Metallurgy – 12 – N

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C12N 15/82 (2006.01)

Patent

CA 2666383

Compositions and methods for reducing the level of nornicotine and N '- nitrosonornicotine (NNN) in Nicotiana plants and plant parts thereof are provided. The compositions comprise isolated polynucleotides and polypeptides for cytochrome P450s that are involved in the metabolic conversion of nicotine to nornicotine in these plants. Expression cassettes, vectors, plants, and plant parts thereof comprising inhibitory sequences that target expression or function of the disclosed cytochrome P450 polypeptides are also provided. Methods for the use of these novel sequences to inhibit expression or function of cytochrome P450 polypeptides involved in this metabolic conversion are also provided. The methods find use in the production of tobacco products that have reduced levels of nornicotine and its carcinogenic metabolite, NNN, and thus reduced carcinogenic potential for individuals consuming these tobacco products or exposed to secondary smoke derived from these products.

L'invention concerne des compositions et des procédés pour réduire le taux de nornicotine et de N'-nitrosonornicotine (NNN) dans les plantes de Nicotiana et des parties de plante de celle-ci. Les compositions comportent des polynucléotides et des polypeptides isolés pour des cytochromes P450 qui sont impliqués dans la conversion métabolique de la nicotine en nornicotine dans ces plantes. Des cassettes d'expression, des vecteurs, des plantes et des parties de plante comportant des séquences inhibitrices qui ciblent l'expression ou la fonction des polypeptides de cytochrome P450 révélés sont également proposés. Des procédés pour l'utilisation de ces nouvelles séquences pour inhiber l'expression ou la fonction des polypeptides de cytochrome P450 impliqués dans cette conversion métabolique sont également proposés. Les procédés s'utilisent dans la production de produits de tabac qui ont des taux réduits de nornicotine et de son métabolite cancérogène, le NNN, et ainsi un potentiel cancérogène réduit pour des individus consommant ces produits de tabac ou exposés au tabagisme passif dérivé de ces produits.

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