Comparative analysis of virus-derived small RNAs within cassava (Manihot esculenta Crantz) infected with cassava brown streak viruses

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dc.contributor.authorOgwok, Emmanuel
dc.contributor.authorIlyas, Muhammad
dc.contributor.authorAlicai, Titus
dc.contributor.authorRey, Marie E.C.
dc.contributor.authorTaylor, Nigel J.
dc.date.accessioned2022-02-15T19:28:52Z
dc.date.available2022-02-15T19:28:52Z
dc.date.issued2016
dc.description.abstractInfection of plant cells by viral pathogens triggers RNA silencing, an innate antiviral defense mechanism. In response to infection, small RNAs (sRNAs) are produced that associate with Argonaute (AGO)-containing silencing complexes which act to inactivate viral genomes by posttranscriptional gene silencing (PTGS). Deep sequencing was used to compare virus-derived small RNAs (vsRNAs) in cassava genotypes NASE 3, TME 204 and 60444 infected with the positive sense single-stranded RNA (+ssRNA) viruses Cassava brown streak virus (CBSV) and Ugandan cassava brown streak virus (UCBSV), the causal agents of cassava brown streak disease (CBSD). An abundance of 21-24 nt vsRNAs was detected and mapped, covering the entire CBSV and UCBSV genomes. The 21 nt vsRNAs were most predominant, followed by the 22 nt class with a slight bias toward sense compared to antisense polarity, and a bias for adenine and uracil bases present at the 5’-terminus. Distribution and frequency of vsRNAs differed between cassava genotypes and viral genomes. In susceptible genotypes TME 204 and 60444, CBSV-derived sRNAs were seen in greater abundance than UCBSV-derived sRNAs. NASE 3, known to be resistant to UCBSV, accumulated negligible UCBSV-derived sRNAs but high populations of CBSV-derived sRNAs. Transcript levels of cassava homologues of AGO2, DCL2 and DCL4, which are central to the gene-silencing complex, were found to be differentially regulated in CBSV- and UCBSV-infected plants across genotypes, suggesting these proteins play a role in antiviral defense. Irrespective of genotype or viral pathogen, maximum populations of vsRNAs mapped to the cytoplasmic inclusion, P1 and P3 protein-encoding regions. Our results indicate disparity between CBSV and UCBSV host-virus interaction mechanisms, and provide insight into the role of virus-induced gene silencing as a mechanism of resistance to CBSD.en_US
dc.identifier.citationOgwok, E., Ilyas, M., Alicai, T., Rey, M. E., & Taylor, N. J. (2016). Comparative analysis of virus-derived small RNAs within cassava (Manihot esculenta Crantz) infected with cassava brown streak viruses. Virus research, 215, 1-11. http://dx.doi.org/doi:10.1016/j.virusres.2016.01.015en_US
dc.identifier.urihttp://dx.doi.org/doi:10.1016/j.virusres.2016.01.015
dc.identifier.urihttps://nru.uncst.go.ug/xmlui/handle/123456789/2157
dc.language.isoenen_US
dc.publisherVirus researchen_US
dc.subjectDeep sequencingen_US
dc.subjectCassava brown streak diseaseen_US
dc.subjectCassavaen_US
dc.subjectVirus-derived small RNAen_US
dc.titleComparative analysis of virus-derived small RNAs within cassava (Manihot esculenta Crantz) infected with cassava brown streak virusesen_US
dc.typeArticleen_US
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