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"constitutive promoter"

Article
배추 유래 전신발현 프로모터의 동정
Identification of Constitutive Promoters Derived from Brassica rapa
Jin Sun Kim, Sun-Hyung Lim, Young-Mi Kim, Jong-Yeol Lee
Korean. J. Breed. Sci. 2018;50(3):193-202.   Published online September 1, 2018
DOI: https://doi.org/10.9787/KJBS.2018.50.3.193

Promoters are essential regulatory elements for efficiently expressing a gene of interest in a target tissue of a organism. Therefore, the identification of a suitable promoter is important in plant biotechnology. In this study, four promoters were selected and identified to be constitutively or tissue-specifically expressed in Brassica rapa bacterial artificial chromosome (BAC) clones using the results of transcriptomic analysis of Brassica rapa and open-source database information on Arabidopsis thaliana. The 2 kb region of the 5′ upstream was isolated from the Brassica rapa genomic DNA for each promoter. The four promoters were then fused to β-glucuronidase (gus) and green fluorescent protein (gfp) genes, and the recombinant transgenes were introduced into Arabidopsis. As a result of histochemical GUS staining, GFP fluorescence and RT-PCR, the gus gene was observed to be expressed constitutively in all tissues using all four promoters. A GUS activity assay using fluorescent 4-MUG revealed that the BR11 promoter showed similar activity to the CaMV35S promoter, while the BR4, BR15, and BR16 promoters showed 1.5, 4, and 18-fold higher activities than the CaMV35S promoter, respectively. These results indicate that these four promoters could be used to incorporate useful genes with enhanced function into crops of interest.

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