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http://dx.doi.org/10.7235/hort.2012.12093

Comparison of RNA Interference-mediated Gene Silencing and T-DNA Integration Techniques for Gene Function Analysis in Chinese Cabbage  

Yu, Jae-Gyeong (Department of Horticultural Biotechnology, Kyung Hee University)
Lee, Gi-Ho (Department of Horticultural Biotechnology, Kyung Hee University)
Park, Young-Doo (Department of Horticultural Biotechnology, Kyung Hee University)
Publication Information
Horticultural Science & Technology / v.30, no.6, 2012 , pp. 734-742 More about this Journal
Abstract
To compare RNA interference-mediated gene silencing technique and T-DNA integration for gene function analysis in Chinese cabbage, BrSAMS-knockout (KO) line and BrSAMS-knockdown (KD) line were used. The KO line had lost the function of a Brassica rapa S-adenosylmethionine synthetase (BrSAMS) gene by T-DNA insertion and the KD line had shown down-regulated BrSAMS genes' expression by dsRNA cleavage. From microarray results of the KO and KD lines, genes linked to SAMS such as sterol, sucrose, homogalacturonan biosynthesis and glutaredoxin-related protein, serine/threonine protein kinase, and gibberellin-responsive protein showed distinct differences in their expression levels. Even though one BrSAMS gene in the KO line was broken by T-DNA insertion, gene expression pattern of that line did not show remarkable differences compared to wild type control. However, the KD line obtained by RNAi technique showed prominent difference in its gene expression. Besides, change of polyamine and ethylene synthesis genes directly associated with BrSAMS was displayed much more in the KD line. In the microarray analysis of the KO line, BrSAMS function could not be clearly defined because of BrSAMS redundancy due to the genome triplication events in Brassicaceae. In conclusion, we supposed that gene knock-down method by RNAi silencing is more effective than knock-out method by T-DNA insertion for gene function analysis of polyploidy crops such as Chinese cabbage.
Keywords
knock-down; knock-out; microarray; S-adenosylmethionine synthetase;
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