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- W3096981692 abstract "Abstract Orphan genes ( OG s), which are genes unique to a specific taxon, play a vital role in primary metabolism. However, little is known about the functional significance of Brassica rapa OG s ( BrOG s) that were identified in our previous study. To study their biological functions, we developed a BrOG overexpression ( BrOG OE) mutant library of 43 genes in Arabidopsis thaliana and assessed the phenotypic variation of the plants. We found that 19 of the 43 BrOG OE mutants displayed a mutant phenotype and 42 showed a variable soluble sugar content. One mutant, BrOG1 OE, with significantly elevated fructose, glucose, and total sugar contents but a reduced sucrose content, was selected for in-depth analysis. BrOG1 OE showed reduced expression and activity of the Arabidopsis sucrose synthase gene ( AtSUS ); however, the activity of invertase was unchanged. In contrast, silencing of two copies of BrOG1 in B. rapa, BraA08002322 ( BrOG1A ) and BraSca000221 ( BrOG1B ), by the use of an efficient CRISPR/Cas9 system of Chinese cabbage ( B. rapa ssp. campestris ) resulted in decreased fructose, glucose, and total soluble sugar contents because of the upregulation of BrSUS1b , BrSUS3 , and, specifically, the BrSUS5 gene in the edited BrOG1 transgenic line. In addition, we observed increased sucrose content and SUS activity in the BrOG1 mutants, with the activity of invertase remaining unchanged. Thus, BrOG1 probably affected soluble sugar metabolism in a SUS-dependent manner. This is the first report investigating the function of BrOG s with respect to soluble sugar metabolism and reinforced the idea that OG s are a valuable resource for nutrient metabolism." @default.
- W3096981692 created "2020-11-09" @default.
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- W3096981692 date "2020-11-01" @default.
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- W3096981692 title "Brassica rapa orphan genes largely affect soluble sugar metabolism" @default.
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- W3096981692 doi "https://doi.org/10.1038/s41438-020-00403-z" @default.
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