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Expression of a novel bi-directional Brassica napus promoter in soybean

文献类型： 外文期刊

作者： Chennareddy, Siva 1 ; Cicak, Toby 1 ; Clark, Lauren 2 ; Russell, Sean 2 ; Skokut, Michiyo 2 ; Beringer, Jeffrey 2 ; Ya 1 ;

作者机构： 1.Dow AgroSci, W Lafayette, IN 47906 USA

2.Dow AgroSci, Indianapolis, IN 46268 USA

3.Beijing Acad Agr & Forestry Sci, Beijing 100097, Peoples R China

关键词： Bi-directional promoter;Soybean (Glycine max);Gene expression;GFP;GUS;Agrobacterium-mediated transformation

期刊名称：TRANSGENIC RESEARCH （ 影响因子：2.788； 五年影响因子：2.377 ）

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收录情况： SCI

摘要： The expression profile of a natural bi-directional promoter, derived from the Brassica napus EPSPS-A gene, was studied in transgenic soybean (Glycine max C.V. Maverick) lines. Two constructs, pDAB100331 and pDAB100333, were assembled to test the bi-directionality of the promoter. Two reporter genes, gfp and gusA, were employed and they were interchangeably placed in both constructs, one on each end of the promoter such that both proteins expressed divergently in each construct. In the T-0 generation, GUS expression was more uniform throughout the leaf of pDAB100333 transgenic plants, where the gusA gene was expressed from the downstream or EPSPS-A end of the bi-directional promoter. Comparatively, GUS expression was more localized in the midrib and veins of the leaf of pDAB100331 transgenic plants, where the gusA gene was expressed from the upstream end of the bi-directional promoter. These observations indicated a unique expression pattern from each end of the promoter and consistently higher expression in genes expressed from the downstream end (e.g., EPSPS-A end) of the promoter in the tissues examined. The GFP expression pattern followed that of GUS when placed in the same position relative to the promoter. In the T-1 generation, transcript analysis also showed higher expression of both gusA and gfp when those genes were located at the downstream end of the promoter. Accordingly, the pDAB100331 events exhibited a higher gfp/gusA transcript ratio, while pDAB100333 events produced a higher gusA/gfp transcript ratio consistent with the observations in T-0 plants. These results demonstrated that the EPSPS-A gene bidirectional promoter can be effectively utilized to drive expression of two transgenes for the desired traits.

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