Journal
PLANTA
Volume 232, Issue 6, Pages 1281-1288Publisher
SPRINGER
DOI: 10.1007/s00425-010-1253-3
Keywords
Artificial microRNA; Phenylalanine ammonia-lyase; Populus trichocarpa transformation; Down-regulation; PolyA tailing-based real time RT-PCR; Quantitation
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Funding
- Forest Biotechnology Industrial Research Consortium (FORBIRC) at North Carolina State University
- National Science Foundation [DBI-0922391]
- Direct For Biological Sciences
- Division Of Integrative Organismal Systems [0922391] Funding Source: National Science Foundation
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Artificial microRNAs (amiRNAs) are similar to microRNAs (miRNAs) in that they are able to reduce the abundance of specific transcripts in plants by RNA-Induced Silencing Complex (RISC)-mediated cleavage and degradation, but differ in that they are designed for specific targets. The long generation times of forest trees have limited the discovery of mutations by conventional genetics. AmiRNAs can create gene-specific transcript reduction in transgenic trees in a single generation and may have broad application for functional genomics of trees. In this paper, we describe the specific down-regulation of multiple genes in the phenylalanine ammonia-lyase (PAL) gene family of Populus trichocarpa using amiRNA sequences incorporated in a P. trichocarpa miRNA-producing precursor, ptc-MIR408. Two different amiRNA constructs were designed to specifically down-regulate two different subsets of PAL genes, revealing differential regulation within the gene family. Down-regulation of subset A (PAL2, PAL4 and PAL5) by amiRNA-palA led to an increase in transcript abundance of subset B (PAL1 and PAL3). The reciprocal effect was not observed.
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