Novel starches via modification of expression of starch...

C - Chemistry – Metallurgy – 12 – N

Patent

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C12N 15/82 (2006.01) A01H 5/00 (2006.01) A23L 1/0522 (2006.01) C08B 30/00 (2006.01) C12N 9/10 (2006.01) C12P 19/04 (2006.01)

Patent

CA 2239979

The instant invention discloses utilization of a cDNA clone to construct sense and antisense genes for inhibition of starch branching enzyme enzymatic activity in corn. More specifically, this invention concerns a method of controlling the starch fine structure of starch derived from the grain of corn comprising: (1) preparing a chimeric gene comprising a nucleic acid fragment encoding a starch branching enzyme structural gene or a fragment thereof, operably linked in either sense or anti--sense orientation on the upstream side to a nucleic acid fragment encoding a promoter that directs gene expression in corn endosperm tissue, and operably linked on the downstream side to a nucleic acid fragment encoding a suitable regulatory sequence for transcriptional termination, and (2) transforming corn with said chimeric gene, wherein expression of said chimeric gene results in alteration of the fine structure of starch derived from the grain of said transformed corn compared to the fine structure of starch derived from corn not possessing said chimeric gene.

On décrit l'utilisation d'un clone d'ADN complémentaire pour construire des gènes sens et antisens chargés d'inhiber l'activité enzymatique de l'enzyme de ramification de l'amidon du maïs. Plus précisément, un procédé qui permet de maîtriser la structure fine de l'amidon provenant de grains de maïs, consiste: 1) à préparer un gène chimérique comprenant un fragment d'acide nucléique qui code un gène de structure d'enzyme de ramification d'amidon ou un de ses fragments, activement lié selon une orientation sens ou antisens, du côté amont, à un fragment d'acide nucléique codant un promoteur qui dirige l'expression du gène dans le tissu de l'endosperme du maïs, et activement lié, du côté aval, à un fragment d'acide nucléique codant une séquence régulatrice appropriée en vue d'une terminaison transcriptionnelle. Ce procédé consiste ensuite 2) à transformer du maïs avec ce gène chimérique dont l'expression résulte en une modification de la structure fine de l'amidon provenant des grains dudit maïs transformé par rapport à celle de l'amidon provenant d'un maïs dépourvu de ce gène chimérique.

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