Process for producing arachidonic acid and/or...

C - Chemistry – Metallurgy – 12 – N

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C12N 15/82 (2006.01) A23L 1/30 (2006.01) A61K 31/202 (2006.01) C07K 14/415 (2006.01)

Patent

CA 2658273

The present invention relates to a process for producing arachidonic acid (= ARA) or eicosapentaenoic acid (= EPA) or arachidonic acid and eicosapentaenoic acid, advantageously in the seed of transgenic plants of the family Brassicaceae having a content of ARA or EPA, or ARA and EPA, of at least 3% by weight, based on the total lipid content of the transgenic plant, by introducing into the organism nucleic acids which code for polypeptides having .DELTA.-6-desaturase, .DELTA.-6-elongase and .DELTA.-5-desaturase activity, wherein, as a result of the enzymatic activity of the introduced enzymes, a fatty acid selected from the group consisting of the fatty acids oleic acid [C18:1.DELTA.9], linoleic acid [C18:2.DELTA.9, 12], .alpha.-linolenic acid [C18:3.DELTA.6, 9, 12], eicosenoic acid (20:1.DELTA.11) and erucic acid [C22:1.DELTA.13] is reduced by at least 10% compared with the nontransgenic wild type plant. Advantageously, other enzymes selected from the group of the enzymes .omega.-3-desaturases, .DELTA.-12-desaturases, .DELTA.-6-desaturases, .DELTA.-6-elongases, .DELTA.-5-desaturases, .DELTA.-5-elongases and/or .DELTA.-4-desaturases can be introduced into the plants.

La présente invention concerne un procédé de fabrication d'acide arachidonique (= ARA) ou d'acide eicosapentaénoïque (= EPA) ou d'acide arachidonique et d'acide eicosapentaénoïque de manière avantageuse dans des semences de plantes transgéniques de la famille des Brassicaceae avec une teneur en ARA ou EPA ou ARA et EPA supérieure ou égale à 3 % en poids par rapport à la teneur totale en lipide de la plante transgénique, selon lequel des acides nucléiques sont introduits dans l'organisme, lesdits acides nucléiques codant pour des polypeptides présentant une activité .DELTA.-6-désaturase-, .DELTA.-6-élongase- et .DELTA.-5-désaturase. Selon l'invention, l'activité enzymatique de l'enzyme introduite permet de réduire un acide gras choisi dans le groupe constitué des acides gras acide oléique [C18:1.DELTA.9], acide linoléique [C18:2.DELTA.9, 12], acide .alpha.-linoléique [C18:3.DELTA.6, 9, 12], acide icosénique (20:1.DELTA.11) et acide érucique [C22:1.DELTA.13]d'au moins 10 % par rapport à la plante de type sauvage non transgénique. De manière avantageuse, des enzymes supplémentaires, choisies dans le groupe comprenant les enzymes .omega.-3-désaturase, .DELTA.-12-désaturase, .DELTA.-6-désaturase, .DELTA.-6-élongase, .DELTA.-5-désaturase, .DELTA.-5-élongase et/ou .DELTA.-4-désaturase, peuvent être introduites dans les plantes.

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