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- W2013064798 abstract "On the basis of genome nucleotide differences between a nonneuropathogenic and a neuropathogenic lactate dehydrogenase-elevating virus (LDV) quasispecies (LDV-P and LDV-C, respectively), we have designed sets of primers for polymerase chain reaction (PCR) amplification that can detect recombinants between them in a 1276-nt-long segment ranging from ORF 5 to ORF 7. Mice were infected with large amounts of both LDVs and bled at various times postinfection (p.i.). RNA was extracted from plasma samples and reverse transcribed and the first-strand products were PCR amplified with four sets of sense and antisense primers that discriminate between parental (P/P and C/C) and recombinant (P/C and C/P) genomic segments. Both P/C and C/P recombinants were detected in plasma from six different mice at 1 day p.i. No recombinant products were generated with in vitro mixtures of LDV-P and LDV-C. End-point dilution experiments indicated that the generation of P/C and C/P recombinants varied between mice but that in some mice the frequency of recombination in the 1276-nt-long genome segment was as high as 5%. Sequence analyses of clones of some recombinants indicated that recombination had occurred at 26- to 43-nt-long stretches of homology between the LDV-P and the LDV-C genomes. Sequence analyses of the 3157-nt-long 3′ end of the genomes of the neuropathogenic LDV-v and of a newly discovered nonneuropathogenic quasispecies, LDV-vx, showed that LDV-v is a natural recombinant of LDV-vx that has specifically acquired by a double recombination about 400 nt of the 5′ end of ORF 5 of the neuropathogenic LDV-C and thereby the unique properties of LDV-C, neuropathogenicity and high sensitivity to antibody neutralization. In dual infections of mice with LDV-P and LDV-C all genetic recombinants, like the LDV-C parent itself, had been lost by 7 days p.i., and only LDV-P persisted. The results further support the view that LDV-P and LDV-vx have evolved to a highly stable relationship with their host, the mouse." @default.
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- W2013064798 date "1999-05-01" @default.
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- W2013064798 title "High-Frequency Homologous Genetic Recombination of an Arterivirus, Lactate Dehydrogenase-Elevating Virus, in Mice and Evolution of Neuropathogenic Variants" @default.
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- W2013064798 doi "https://doi.org/10.1006/viro.1999.9660" @default.
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