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- W7949008 abstract "Transitive RNAi is a posttranscriptional mechanism of gene silencing that is based on the phenomenon of “transitivity.” This term refers to the spreading of silencing outside of the initial target sequence and is associated with transgene-induced posttranscriptional gene silencing (PTGS). Transitive RNAi is triggered by placing an inverted repeat sequence immediately 3′ of the sense transgene that is to be targeted. Placement of the inverted repeat in this region is thought to increase the efficiency by which RDR6 initiates copying of the transgene to generate double-stranded RNA (dsRNA). In a proof-of-concept approach, we showed that select subsets of genes can be manipulated with transitive RNAi in a high-throughput forward mutagenesis approach (Plant J 61:873–882, 2010). Laser microdissection of Arabidopsis mesophyll cells and en masse cloning of the resulting cDNA libraries into transitive RNAi vectors demonstrated that approximately 15% of genes in the pilot study could generate visible phenotypes, resulting in photosynthetic defects. The capacity for transitive RNAi to silence multiple members of gene family members demonstrated the utility of this approach for forward mutagenesis of redundant gene functions. Targeted silencing of a focused population of gene transcripts by transitive RNAi provides an efficient and complementary approach to procedures that target the entire genome. The ability of RNAi to target closely related genes holds promise for its use in forward mutagenesis of polyploid plants, which exhibit high levels of genetic redundancy. Advantages of transitive RNAi as a forward genetic approach, as well as potential drawbacks to this method, are discussed." @default.
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- W7949008 date "2011-01-01" @default.
- W7949008 modified "2023-09-26" @default.
- W7949008 title "Mutagenesis by Transitive RNAi" @default.
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- W7949008 doi "https://doi.org/10.1007/978-3-642-19454-2_25" @default.
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