A ribozyme gene and an antisense gene are equally effective in conferring resistance to tobacco mosaic virus on transgenic tobacco

Molecular & General Genetics : MGG
R de FeyterW Gerlach

Abstract

Ribozymes of the hammerhead class can be designed to cleave a target RNA in a sequence-specific manner and can potentially be used to specifically modulate gene activity. We have targeted the tobacco mosaic virus (TMV) genome with a ribozyme containing three catalytic hammerhead domains embedded within a 1 kb antisense RNA. The ribozyme was able to cleave TMV RNA at all three target sites in vitro at 25 degrees C. Transgenic tobacco plants were generated which expressed the ribozyme or the corresponding antisense constructs directed at the TMV genome. Six of 38 independent transgenic plant lines expressing the ribozyme and 6 of 39 plant lines expressing the antisense gene showed some level of protection against TMV infection. Homozygous progeny of some lines were highly resistant to TMV; at least 50% of the plants remained asymptomatic even when challenged with high levels of TMV. These plants also displayed resistance to infection with TMV RNA or the related tomato mosaic virus (ToMV). In contrast, hemizygous plants of the same lines displayed only very weak resistance when inoculated with low amounts of TMV and no resistance against high inoculation levels. Resistance in homozygous plants was not overcome by a TMV strain whic...Continue Reading

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Citations

May 13, 1997·Proceedings of the National Academy of Sciences of the United States of America·X YangP Tien
Jan 1, 1996·Antisense & Nucleic Acid Drug Development·G H CantorG H Palmer
Nov 25, 1998·Nucleic Acids Research·N K VaishF Eckstein
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Dec 1, 2006·Plant Biotechnology Journal·Frédéric BussièreDaniel P Matton
Jun 1, 2004·Nutrition Research Reviews·Paul Christou, Richard M Twyman

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