Year

2019

Degree Name

Doctor of Philosophy

Department

School of Biological Sciences

Abstract

Double-stranded RNA (dsRNA)-induced gene silencing, or RNA interference (RNAi), is a conserved gene control mechanism in eukaryotes that has been exploited extensively as a tool for gene knockdown. In plants, RNAi has been achieved mainly through the expression of transgenes encoding long hairpin-shaped RNA (hpRNA), which has proven to be a powerful tool in gene function studies and crop improvement. A typical hpRNA transgene construct is comprised of a perfect inverted repeat with a sense and antisense sequence of the target gene, separated by a spacer sequence. A number of studies from us and others have indicated that hpRNA transgenes are subject to self-induced transcriptional silencing (self-silencing), compromising the efficiency and long-term stability of RNAi against target genes. We assumed that self-silencing of hpRNA transgenes is due to the perfect invertedrepeat DNA structure and small RNA-directed DNA methylation.

My thesis was aimed at developing and testing new hpRNA transgene designs that could minimize transcriptional self-silencing and give stable and effective target gene silencing...

This thesis is unavailable until Tuesday, June 02, 2020

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Unless otherwise indicated, the views expressed in this thesis are those of the author and do not necessarily represent the views of the University of Wollongong.