Foreign Complementary Sequences Facilitate Genetic RNA Recombination in Brome Mosaic Virus

We have demonstrated that local antisense sequences can mediate genetic recombination within the 3′ noncoding region among brome mosaic virus (BMV) RNAs (P. Nagy and J. J. Bujarski, 1993, Proc, Natl. Acad. Sci. USA 90, 6390-6394). Here we show that foreign complementary inserts can direct crossovers...

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Bibliographic Details
Published in:Virology (New York, N.Y.) N.Y.), 1995-04, Vol.208 (1), p.370-375
Main Authors: Dzianott, Aleksandra, Flasinski, Stanislaw, Bujarski, Jozef J.
Format: Article
Language:English
Subjects:
Antisense Elements (Genetics)
ARN
brome mosaic virus
BROMOVIRUS
Bromovirus - genetics
CROSSING OVER
CRUZAMIENTO INTERCROMOSOMICO
MUTACION
MUTATION
RECOMBINACION
RECOMBINAISON
Recombination, Genetic
RNA, Viral - genetics
SECUENCIA NUCLEICA
SEQUENCE NUCLEIQUE
VIRUS DE LAS PLANTAS
VIRUS DES VEGETAUX
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Summary:We have demonstrated that local antisense sequences can mediate genetic recombination within the 3′ noncoding region among brome mosaic virus (BMV) RNAs (P. Nagy and J. J. Bujarski, 1993, Proc, Natl. Acad. Sci. USA 90, 6390-6394). Here we show that foreign complementary inserts can direct crossovers between BMV RNA3 components within an internal region. A 170-nt polynucleotide derived from the cowpea chlorotic mottle virus (CCMV) RNA3 was inserted just upstream of the initiation cordon of the BMV coat protein open reading frame in either sense or antisense orientations. The resulting respective mutants, BCC+ and BCC-, maintained unchanged CCMV inserts when inoculated separately on leaves of a local lesion host for BMV. In contrast, when a mixture containing both mutated RNAs3 was inoculated, a significant fraction of lesions accumulated the BMV RNA3 lacking the CCMV insert. The presence of a 3′ marker mutation confirmed that the BMV RNA3 progeny arose due to crossovers between BCC+ and BCC- within the complementary sequences. The highest frequency of recombinant appearance was observed when the RNA mixtures were annealed prior to inoculation on the host plants. Our results confirm a concept predicting the general nature of the heteroduplex-mediated recombination functioning in RNA viruses. Examples of possible applications of this approach in recombinant RNA technology are discussed.
ISSN:0042-6822
1096-0341
DOI:10.1006/viro.1995.1163