Canola engineered with a microalgal polyketide synthase-like system produces oil enriched in docosahexaenoic acid.

Abstract:

:Dietary omega-3 long-chain polyunsaturated fatty acids (LC-PUFAs), docosahexaenoic acid (DHA, C22:6) and eicosapentaenoic acid (EPA, C20:5) are usually derived from marine fish. Although production of both EPA and DHA has been engineered into land plants, including Arabidopsis, Camelina sativa and Brassica juncea, neither has been produced in commercially relevant amounts in a widely grown crop. We report expression of a microalgal polyketide synthase-like PUFA synthase system, comprising three multidomain polypeptides and an accessory enzyme, in canola (Brassica napus) seeds. This transgenic enzyme system is expressed in the cytoplasm, and synthesizes DHA and EPA de novo from malonyl-CoA without substantially altering plastidial fatty acid production. Furthermore, there is no significant impact of DHA and EPA production on seed yield in either the greenhouse or the field. Canola oil processed from field-grown grain contains 3.7% DHA and 0.7% EPA, and can provide more than 600 mg of omega-3 LC-PUFAs in a 14 g serving.

journal_name

Nat Biotechnol

journal_title

Nature biotechnology

authors

Walsh TA,Bevan SA,Gachotte DJ,Larsen CM,Moskal WA,Merlo PA,Sidorenko LV,Hampton RE,Stoltz V,Pareddy D,Anthony GI,Bhaskar PB,Marri PR,Clark LM,Chen W,Adu-Peasah PS,Wensing ST,Zirkle R,Metz JG

doi

10.1038/nbt.3585

subject

Has Abstract

pub_date

2016-08-01 00:00:00

pages

881-7

issue

8

eissn

1087-0156

issn

1546-1696

pii

nbt.3585

journal_volume

34

pub_type

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