Global and local perturbation of the tomato microRNA pathway by a trans-activated DICER-LIKE 1 mutant

DICER-like 1 (DCL1) is a major player in microRNA (miRNA) biogenesis and accordingly, its few known loss-of-function mutants are either lethal or display arrested development. Consequently, generation of dcl1 mutants by reverse genetics and functional analysis of DCL1 in late-developing organs are c...

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Veröffentlicht in:Journal of experimental botany. - 1985. - 65(2014), 2 vom: 24. Feb., Seite 725-39
1. Verfasser: Kravchik, Michael (VerfasserIn)
Weitere Verfasser: Sunkar, Ramanjulu, Damodharan, Subha, Stav, Ran, Zohar, Matat, Isaacson, Tal, Arazi, Tzahi
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2014
Zugriff auf das übergeordnete Werk:Journal of experimental botany
Schlagworte:Journal Article Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, Non-P.H.S. Carotenoid DCL1 leaf miRNA mutant petal tomato. mehr... MicroRNAs Plant Proteins RNA, Plant RNA, Small Interfering Carotenoids 36-88-4 Ribonuclease III EC 3.1.26.3
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100 1 |a Kravchik, Michael  |e verfasserin  |4 aut 
245 1 0 |a Global and local perturbation of the tomato microRNA pathway by a trans-activated DICER-LIKE 1 mutant 
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520 |a DICER-like 1 (DCL1) is a major player in microRNA (miRNA) biogenesis and accordingly, its few known loss-of-function mutants are either lethal or display arrested development. Consequently, generation of dcl1 mutants by reverse genetics and functional analysis of DCL1 in late-developing organs are challenging. Here, these challenges were resolved through the unique use of trans-activated RNA interference. Global, as well as organ-specific tomato DCL1 (SlDCL1) silencing was induced by crossing the generated responder line (OP:SlDCL1IR) with the appropriate driver line. Constitutive trans-activation knocked down SlDCL1 levels by ~95%, resulting in severe abnormalities including post-germination growth arrest accompanied by decreased miRNA and 21-nucleotide small RNA levels, but prominently elevated levels of 22-nucleotide small RNAs. The increase in the 22-nucleotide small RNAs was correlated with specific up-regulation of SlDCL2b and SlDCL2d, which are probably involved in their biogenesis. Leaf- and flower-specific OP:SlDCL1IR trans-activation inhibited blade outgrowth, induced premature bud senescence and produced pale petals, respectively, emphasizing the importance of SlDCL1-dependent small RNAs in these processes. Together, these results establish OP:SlDCL1IR as an efficient tool for analysing processes regulated by SlDCL1-mediated gene regulation in tomato 
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650 4 |a Carotenoid 
650 4 |a DCL1 
650 4 |a leaf 
650 4 |a miRNA 
650 4 |a mutant 
650 4 |a petal 
650 4 |a tomato. 
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650 7 |a Plant Proteins  |2 NLM 
650 7 |a RNA, Plant  |2 NLM 
650 7 |a RNA, Small Interfering  |2 NLM 
650 7 |a Carotenoids  |2 NLM 
650 7 |a 36-88-4  |2 NLM 
650 7 |a Ribonuclease III  |2 NLM 
650 7 |a EC 3.1.26.3  |2 NLM 
700 1 |a Sunkar, Ramanjulu  |e verfasserin  |4 aut 
700 1 |a Damodharan, Subha  |e verfasserin  |4 aut 
700 1 |a Stav, Ran  |e verfasserin  |4 aut 
700 1 |a Zohar, Matat  |e verfasserin  |4 aut 
700 1 |a Isaacson, Tal  |e verfasserin  |4 aut 
700 1 |a Arazi, Tzahi  |e verfasserin  |4 aut 
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773 1 8 |g volume:65  |g year:2014  |g number:2  |g day:24  |g month:02  |g pages:725-39 
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