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Generation of Defective Interfering RNA Dimers of Cymbidium Ringspot Tombusvirus

Identifieur interne : 001744 ( Istex/Corpus ); précédent : 001743; suivant : 001745

Generation of Defective Interfering RNA Dimers of Cymbidium Ringspot Tombusvirus

Auteurs : Tamás Dalmay ; György Szittya ; J Zsef Burgyán

Source :

RBID : ISTEX:4F7A384318A00A102D81113FBDC4101FF1F267F9

Abstract

Abstract: Inoculation of Nicotiana clevelandii and N. benthamiana plants with in vitro transcripts of both genomic and defective interfering (DI) RNAs of cymbidium ringspot tombusvirus resulted in a rapid accumulation of new DI-like RNA species which were demonstrated by cloning and sequencing to be head-to-tail dimers of unit length DI RNAs. The junction regions of dimers were represented by sequences derived precisely from the 5′ and 3′ termini of DI RNAs. Only infection with DI RNAs of smaller size (DI-2 and DI-3, 402 and 482 nt, respectively) produced detectable amount of dimers; in contrast, infection with the largest DI RNA (DI-13, 679 nt) was unable to accumulate dimers during viral infection. Analysis of mutant DI RNAs containing deletions or insertions revealed that the size of the monomer molecule is a major factor in the accumulation of dimers. Monomeric DI RNAs were formed in both plants and protoplasts inoculated with in vitro-transcribed directs. No heterodimers were found in plants inoculated simultaneously with DI-2 and DI-3 RNA molecules, which may indicate that replicase is not released from the template during synthesis of dimer molecules. However, the occurrence of a recombinant DI RNA dimer molecule derived from the two DI RNAs suggests that simultaneous infection of the same cells with two DI RNAs did indeed take place and that absence of heterodimers did not depend on compartmentalization.

Url:
DOI: 10.1006/viro.1995.1111

Links to Exploration step

ISTEX:4F7A384318A00A102D81113FBDC4101FF1F267F9

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