ArticleBMC genomic data2024
Whole genome sequence analysis of shallot virus X from India reveals it to be a natural recombinant with positive selection pressure.
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Abstract
backgroundShallots are infected by various viruses like Onion yellow dwarf virus (OYDV), Leek yellow stripe virus (LYSV), Shallot latent virus (SLV) and Shallot virus X (ShVX). In India, they have been found to be persistently infected by ShVX. ShVX also infects onion and garlic in combination with other carlaviruses and potyviruses. ShVX is a member of genus Allexivirus of family Alphaflexiviridae. ShVX has a monopartite genome, which is represented by positive sense single-stranded RNA. Globally, only six complete and 3 nearly complete genome sequences of ShV X are reported to date. This number is insufficient to measure a taxon's true molecular diversity. Moreover, the complete genome sequence of ShVX from Asia has not been reported as yet. Therefore, this study was undertaken to generate a complete genome sequence of ShVX from India.
resultsShallot virus X (ShVX) is one of the significant threats to Allium crop production. In this study, we report the first complete genome sequence of the ShVX from India through Next-generation sequencing (NGS). The complete genome of the ShVX (Accession No. OK104171), from this study comprised 8911 nucleotides. In-silico analysis of the sequence revealed variability between this isolate and isolates from other countries. The dissimilarities are spread all over the genome specifically some non-coding intergenic regions. Statistical analysis of individual genes for site-specific selection indicates a positive selection in NABP region. The presence of a recombination event was detected in coat protein region. The sequence similarity percentage and phylogenetic analysis indicate ShVX Indian isolate is a distinctly different isolate. Recombination and site-specific selection may have a function in the evolution of this isolate. This is the first detailed study of the ShVX complete genome sequence from Southeast Asia.
conclusionThis study presents the first report of the entire genome sequence of an Indian isolate of ShVX along with an in-depth exploration of its evolutionary traits. The findings highlight the Indian variant as a naturally occurring recombinant, emphasizing the substantial role of recombination in the evolution of this viral species. This insight into the molecular diversity of strains within a specific geographical region holds immense significance for comprehending and forecasting potential epidemics. Consequently, the insights garnered from this research hold practical value for shaping ShVX management strategies and providing a foundation for forthcoming studies delving into its evolutionary trajectory.
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