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Torralba B, Blanc S, Michalakis Y. Reassortments in single-stranded DNA multipartite viruses: Confronting expectations based on molecular constraints with field observations. Virus Evol 2024; 10:veae010. [PMID: 38384786 PMCID: PMC10880892 DOI: 10.1093/ve/veae010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2023] [Revised: 11/23/2023] [Accepted: 01/30/2024] [Indexed: 02/23/2024] Open
Abstract
Single-stranded DNA multipartite viruses, which mostly consist of members of the genus Begomovirus, family Geminiviridae, and all members of the family Nanoviridae, partly resolve the cost of genomic integrity maintenance through two remarkable capacities. They are able to systemically infect a host even when their genomic segments are not together in the same host cell, and these segments can be separately transmitted by insect vectors from host to host. These capacities potentially allow such viruses to reassort at a much larger spatial scale, since reassortants could arise from parental genotypes that do not co-infect the same cell or even the same host. To assess the limitations affecting reassortment and their implications in genome integrity maintenance, the objective of this review is to identify putative molecular constraints influencing reassorted segments throughout the infection cycle and to confront expectations based on these constraints with empirical observations. Trans-replication of the reassorted segments emerges as the major constraint, while encapsidation, viral movement, and transmission compatibilities appear more permissive. Confronting the available molecular data and the resulting predictions on reassortments to field population surveys reveals notable discrepancies, particularly a surprising rarity of interspecific natural reassortments within the Nanoviridae family. These apparent discrepancies unveil important knowledge gaps in the biology of ssDNA multipartite viruses and call for further investigation on the role of reassortment in their biology.
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Affiliation(s)
- Babil Torralba
- PHIM, Université Montpellier, IRD, CIRAD, INRAE, Institut Agro, Avenue du Campus d’Agropolis - ZAC de Baillarguet, Montpellier 34980, France
| | - Stéphane Blanc
- PHIM, Université Montpellier, IRD, CIRAD, INRAE, Institut Agro, Avenue du Campus d’Agropolis - ZAC de Baillarguet, Montpellier 34980, France
| | - Yannis Michalakis
- MIVEGEC, Université Montpellier, CNRS, IRD, 911, Avenue Agropolis, Montpellier 34394, France
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Zhang S, Yang C, Qiu Y, Liao R, Xuan Z, Ren F, Dong Y, Xie X, Han Y, Wu D, Ramos-González PL, Freitas-Astúa J, Yang H, Zhou C, Cao M. Conserved untranslated regions of multipartite viruses: Natural markers of novel viral genomic components and tags of viral evolution. Virus Evol 2024; 10:veae004. [PMID: 38361819 PMCID: PMC10868557 DOI: 10.1093/ve/veae004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2023] [Revised: 12/20/2023] [Accepted: 01/09/2024] [Indexed: 02/17/2024] Open
Abstract
Viruses with split genomes are classified as being either segmented or multipartite based on whether their genomic segments occur within a single virion or across different virions. Despite variations in number and sequence during evolution, the genomic segments of many viruses are conserved within the untranslated regions (UTRs). In this study, we present a methodology that combines RNA sequencing with iterative BLASTn of UTRs (https://github.com/qq371260/Iterative-blast-v.1.0) to identify new viral genomic segments. Some novel multipartite-like viruses related to the phylum Kitrinoviricota were annotated using sequencing data from field plant samples and public databases. We identified potentially plant-infecting jingmen-related viruses (order Amarillovirales) and jivi-related viruses (order Martellivirales) with at least six genomic components. The number of RNA molecules associated with a genome of the novel viruses in the families Closteroviridae, Kitaviridae, and Virgaviridae within the order Martellivirales reached five. Several of these viruses seem to represent new taxa at the subgenus, genus, and family levels. The diversity of novel genomic components and the multiple duplication of proteins or protein domains within single or multiple genomic components emphasize the evolutionary roles of genetic recombination (horizontal gene transfer), reassortment, and deletion. The relatively conserved UTRs at the genome level might explain the relationships between monopartite and multipartite viruses, as well as how subviral agents such as defective RNAs and satellite viruses can coexist with their helper viruses.
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Affiliation(s)
| | - Caixia Yang
- Liaoning Key Laboratory of Urban Integrated Pest Management and Ecological Security, College of Life Science and Engineering, Shenyang University, 21 Huanan Street, Shenyang, Liaoning 110044, China
| | - Yuanjian Qiu
- National Citrus Engineering and Technology Research Center, Integrative Science Center of Germplasm Creation in Western China (CHONGQING) Science City, Citrus Research Institute, Southwest University, 2 Tiansheng Road, Beibei, Chongqing 400712, China
| | - Ruiling Liao
- National Citrus Engineering and Technology Research Center, Integrative Science Center of Germplasm Creation in Western China (CHONGQING) Science City, Citrus Research Institute, Southwest University, 2 Tiansheng Road, Beibei, Chongqing 400712, China
| | - Zhiyou Xuan
- National Citrus Engineering and Technology Research Center, Integrative Science Center of Germplasm Creation in Western China (CHONGQING) Science City, Citrus Research Institute, Southwest University, 2 Tiansheng Road, Beibei, Chongqing 400712, China
| | - Fang Ren
- Research Institute of Pomology, Chinese Academy of Agricultural Sciences, 98 Xinghainan Street, Xingcheng, Liaoning 125100, China
| | - Yafeng Dong
- Research Institute of Pomology, Chinese Academy of Agricultural Sciences, 98 Xinghainan Street, Xingcheng, Liaoning 125100, China
| | - Xiaoying Xie
- Vector-borne Virus Research Center, College of Plant Protection, Fujian Agriculture and Forestry University, 15 Shangxiadian Road, Fuzhou, Fujian 350002, China
| | - Yanhong Han
- Vector-borne Virus Research Center, College of Plant Protection, Fujian Agriculture and Forestry University, 15 Shangxiadian Road, Fuzhou, Fujian 350002, China
| | - Di Wu
- College of Horticulture and Landscape Architecture, Southwest University, 2 Tiansheng Road, Beibei, Chongqing 400712, China
| | - Pedro Luis Ramos-González
- Laboratório de Biologia Molecular Aplicada, Instituto Biológico, Av. Cons. Rodrigues Alves 1252, São Paulo SP, 04014-002, Brazil
| | - Juliana Freitas-Astúa
- Laboratório de Biologia Molecular Aplicada, Instituto Biológico, Av. Cons. Rodrigues Alves 1252, São Paulo SP, 04014-002, Brazil
- Embrapa Mandioca e Fruticultura, Rua da Embrapa, Caixa Postal 007, CEP, Cruz das Almas BA, 44380-000, Brazil
| | - Huadong Yang
- Hunan Agricultural University, 1 Nongda Road, Changsha, Hunan 410125, China
| | - Changyong Zhou
- National Citrus Engineering and Technology Research Center, Integrative Science Center of Germplasm Creation in Western China (CHONGQING) Science City, Citrus Research Institute, Southwest University, 2 Tiansheng Road, Beibei, Chongqing 400712, China
- Guangxi Citrus Breeding and Cultivation Technology Innovation Center, Guangxi Academy of Specialty Crops, 40 Putuo Road, Guilin, Guangxi 541010, China
- Guangxi Key Laboratory of Germplasm Innovation and Utilization of Specialty Commercial Crops in North Guangxi, Guangxi Academy of Specialty Crops, 40 Putuo Road, Guilin, Guangxi 541010, China
| | - Mengji Cao
- National Citrus Engineering and Technology Research Center, Integrative Science Center of Germplasm Creation in Western China (CHONGQING) Science City, Citrus Research Institute, Southwest University, 2 Tiansheng Road, Beibei, Chongqing 400712, China
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Lal A, Shamim A, Kil EJ, Vo TTB, Qureshi MA, Bupi N, Tabassum M, Lee S. Insights into the Differential Composition of Stem-Loop Structures of Nanoviruses and Their Impacts. Microbiol Spectr 2023; 11:e0479822. [PMID: 37367433 PMCID: PMC10434203 DOI: 10.1128/spectrum.04798-22] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2022] [Accepted: 05/03/2023] [Indexed: 06/28/2023] Open
Abstract
Multipartite viruses package their genomic segments independently and mainly infect plants; few of them target animals. Nanoviridae is a family of multipartite single-stranded DNA (ssDNA) plant viruses that individually encapsidate ssDNAs of ~1 kb and transmit them through aphids without replication in aphid vectors, thereby causing important diseases in host plants, mainly leguminous crops. All of these components constitute an open reading frame to perform a specific role in nanovirus infection. All segments contain conserved inverted repeat sequences, potentially forming a stem-loop structure and a conserved nonanucleotide, TAGTATTAC, within a common region. This study investigated the variations in the stem-loop structure of nanovirus segments and their impact using molecular dynamics (MD) simulations and wet lab approaches. Although the accuracy of MD simulations is limited by force field approximations and simulation time scale, explicit solvent MD simulations were successfully used to analyze the important aspects of the stem-loop structure. This study involves the mutants' design, based on the variations in the stem-loop region and construction of infectious clones, followed by their inoculation and expression analysis, based on nanosecond dynamics of the stem-loop structure. The original stem-loop structures showed more conformational stability than mutant stem-loop structures. The mutant structures were expected to alter the neck region of the stem-loop by adding and switching nucleotides. Changes in conformational stability are suggested expression variations of the stem-loop structures found in host plants with nanovirus infection. However, our results can be a starting point for further structural and functional analysis of nanovirus infection. IMPORTANCE Nanoviruses comprise multiple segments, each with a single open reading frame to perform a specific function and an intergenic region with a conserved stem-loop region. The genome expression of a nanovirus has been an intriguing area but is still poorly understood. We attempted to investigate the variations in the stem-loop structure of nanovirus segments and their impact on viral expression. Our results show that the stem-loop composition is essential in controlling the virus segments' expression level.
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Affiliation(s)
- Aamir Lal
- Department of Integrative Biotechnology, Sungkyunkwan University, Suwon, South Korea
- Department of Plant Medicals, College of Life Sciences, Andong National University, Andong, South Korea
- Agricultural Science and Technology Research Institute, Andong National University, Andong, South Korea
| | - Amen Shamim
- Department of Computer Science, University of Agriculture, Faisalabad, Pakistan
| | - Eui-Joon Kil
- Department of Plant Medicals, College of Life Sciences, Andong National University, Andong, South Korea
- Agricultural Science and Technology Research Institute, Andong National University, Andong, South Korea
| | - Thuy T. B. Vo
- Department of Integrative Biotechnology, Sungkyunkwan University, Suwon, South Korea
| | - Muhammad Amir Qureshi
- Department of Integrative Biotechnology, Sungkyunkwan University, Suwon, South Korea
| | - Nattanong Bupi
- Department of Integrative Biotechnology, Sungkyunkwan University, Suwon, South Korea
| | - Marjia Tabassum
- Department of Integrative Biotechnology, Sungkyunkwan University, Suwon, South Korea
| | - Sukchan Lee
- Department of Integrative Biotechnology, Sungkyunkwan University, Suwon, South Korea
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