Abstract
Copy-back defective interfering RNAs are major contaminants of viral stock preparations of morbilliviruses and other negative strand RNA viruses. They are hybrid molecules of positive sense antigenome and negative sense genome. They possess perfectly complementary ends allowing the formation of extremely stable double-stranded RNA panhandle structures. The presence of the 3′-terminal promoter allows replication of these molecules by the viral polymerase. They thereby negatively interfere with replication of standard genomes. In addition, the double-stranded RNA stem structures are highly immunostimulatory and activate antiviral cell-intrinsic innate immune responses. Thus, copy-back defective interfering RNAs severely affect the virulence and pathogenesis of morbillivirus stocks. We describe two biochemical methods to analyze copy-back defective interfering RNAs in virus-infected samples, or purified viral RNA. First, we present our Northern blotting protocol that allows accurate size determination of defective interfering RNA molecules and estimation of the relative contamination level of virus preparations. Second, we describe a PCR approach to amplify defective interfering RNAs specifically, which allows detailed sequence analysis.
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Andres, F.G.M., Pfaller, C.K. (2024). Molecular Analysis of Copy-Back Defective Interfering RNAs of Morbilliviruses. In: Ma, D.Z., Pfaller, C.K. (eds) Measles and Related Morbilliviruses. Methods in Molecular Biology, vol 2808. Humana, New York, NY. https://doi.org/10.1007/978-1-0716-3870-5_6
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