39e94cfe02ae9932c3ceae619c6c1527 VIE_a2024v10n1.pdf 96376360bd2090bfe15f2b26e6b5f00057d7f505 VIE_a2024v10n1.pdf f316ea5da392a68f22425e2bd869d891e9f27fdc6a1c4164c4239b0d93f42c73 VIE_a2024v10n1.pdf Title: Selection of viral variants with enhanced transmission and reduced neutralization susceptibility alongside lateral introductions may explain the persistence of porcine reproductive and respiratory syndrome virus in vaccinated breeding herds Subject: DOI: https://doi.org/10.1093/ve/veae041 Virus Evolution, 10, 1, xx xx xxxx. Abstract: This study investigates the long-term evolutionary dynamics of porcine reproductive and respiratory syndrome virus (PRRSV-1) in an endemically infected and vaccinated pig herd. Over a one year and a half period, piglets from seven farrowing batches in a 300-sow PRRSV-vaccinated farm were monitored from birth to nine weeks of age by reverse transcription-quantitative polymerase chain reaction (RT-qPCR). Eighty-five PRRSV-positive samples were subjected to whole genome sequencing (Illumina Miseq), and 251 samples to open reading frame 5 (ORF5) sequencing. Farm-specific PRRSV variants’ impact on anti-PRRSV antibodies was evaluated using enzyme-linked immunosorbent and neutralizing antibody assays. The replication kinetics and cytokine inhibition capabilities (IFN-α and TNF-α) of these variants were assessed in porcine alveolar macrophages. The study revealed fluctuating PRRSV-1 incidences in farrowing units and nurseries, attributed to two key evolutionary events: an escape variant emergence and a lateral introduction of a new strain. Initially, strain 1 variant α was swiftly replaced within weeks by variant 1β (99.5 per cent genomic similarity), with twenty-five amino acid mutations, primarily in nsp1α, GP2, GP3, and GP5, including an additional glycosylation site and a deletion downstream the neutralization epitope of GP5. This shift to 1β correlated with increased incidence in nurseries and higher viral loads, with sera from 1α-exposed animals showing reduced neutralization against 1β. Consistently for in vitro assays, variant 1β demonstrated enhanced replication in porcine alveolar macrophages but no difference regarding IFN-α or TNF-α responses. Later, a new strain (strain 2, 83.3 per cent similarity to strain 1) emerged and led to incidence resurgence because of the low cross reactivity with the previous antibodies. The study highlights PRRSV’s rapid adaptability and challenges in controlling its spread, underscoring the necessity for more effective vaccines and eradication approaches. Keywords: PRRSV; endemic; viral evolution; persistence; vaccination. Author: Hepzibar Clilverd Creator: LuaLaTeX with hyperref package Producer: LuaLaTeX; modified using iTextSharp 4.1.6 by 1T3XT CreationDate: Wed May 29 13:59:07 2024 CEST ModDate: Mon Jan 27 09:21:10 2025 CET Custom Metadata: yes Metadata Stream: yes Tagged: yes UserProperties: no Suspects: no Form: none JavaScript: no Pages: 15 Encrypted: no Page size: 595.276 x 782.362 pts Page rot: 0 File size: 15563725 bytes Optimized: no PDF version: 1.5 name type encoding emb sub uni object ID ------------------------------------ ----------------- ---------------- --- --- --- --------- IGCTYH+ArialMT TrueType WinAnsi yes yes no 1 0 KOSRJQ+CaeciliaLTStd-LightItalic CID Type 0C Identity-H yes yes yes 51 0 EYHOGX+CaeciliaLTStd-Italic CID Type 0C Identity-H yes yes yes 46 0 OMFJHB+LatinModernMath-Regular CID Type 0C Identity-H yes yes yes 42 0 FVXFXB+CaeciliaLTStd-Heavy CID Type 0C Identity-H yes yes yes 47 0 KCDEDD+CaeciliaLTStd-Light CID Type 0C Identity-H yes yes yes 45 0 XVZVYO+LMRoman10-Regular CID Type 0C Identity-H yes yes yes 44 0 ZZHISU+CaeciliaLTStd-Roman CID Type 0C Identity-H yes yes yes 119 0 BRLBLC+CaeciliaLTStd-Bold CID Type 0C Identity-H yes yes yes 43 0 OMFJHB+LatinModernMath-Regular CID Type 0C Identity-H yes yes yes 41 0 OMFJHB+LatinModernMath-Regular CID Type 0C Identity-H yes yes yes 85 0 Jhove (Rel. 1.28.0, 2023-05-18) Date: 2025-01-30 02:45:42 CET RepresentationInformation: VIE_a2024v10n1.pdf ReportingModule: PDF-hul, Rel. 1.12.4 (2023-03-16) LastModified: 2025-01-29 08:32:29 CET Size: 15563725 Format: PDF Version: 1.5 Status: Well-Formed and valid SignatureMatches: PDF-hul MIMEtype: application/pdf Profile: Tagged PDF PDFMetadata: Objects: 2387 FreeObjects: 1 IncrementalUpdates: 0 DocumentCatalog: ViewerPreferences: HideToolbar: false HideMenubar: false HideWindowUI: false FitWindow: false CenterWindow: false DisplayDocTitle: true NonFullScreenPageMode: UseNone Direction: L2R ViewArea: CropBox ViewClip: CropBox PrintArea: CropBox PageClip: CropBox PageLayout: SinglePage PageMode: UseOutlines Language: en-US Outlines: Item: Title: Selection of viral variants with enhanced transmission and reduced neutralization susceptibility alongside lateral introductions may explain the persistence of porcine reproductive and respiratory syndrome virus in vaccinated breeding herds Children: Item: Title: 1. Introduction Item: Title: 2. Materials and methods Children: Item: Title: 2.1 Study farm and follow-up chronology Item: Title: 2.2 PRRSV detection Item: Title: 2.3 PRRSV isolation Item: Title: 2.4 Sequencing Item: Title: 2.5 Phylogenetic and evolutionary analysis Item: Title: 2.6 Adaptation to grow on MARC-145 cells and viral production in PAM Item: Title: 2.7 Serological analyses (enzyme-linked immunosorbent assay and viral neutralization test) Item: Title: 2.8 Viral replication kinetics Item: Title: 2.9 Attachment of different viral variants to PAM Item: Title: 2.10 Inhibition of IFN-α and TNF-α Item: Title: 2.11 Statistical analyses Item: Title: 3. Results Children: Item: Title: 3.1 PRRSV infection dynamics in the farm and VTEs Item: Title: 3.2 Phylogenetic and recombination analyses and viral variant characterization Item: Title: 3.3 Serological analyses Item: Title: 3.4 Replication kinetics of variants 1α and 1β in PAM Item: Title: 3.5 Attachment of variants 1α and 1β on PAM Item: Title: 3.6 Inhibition of poly I:C induced IFN-α and TNF-α Item: Title: 4. Discussion Item: Title: Data availability Item: Title: Supplementary data Item: Title: Acknowledgements Item: Title: Funding Item: Title: Conflict of interest: Item: Title: References Info: Title: Selection of viral variants with enhanced transmission and reduced neutralization susceptibility alongside lateral introductions may explain the persistence of porcine reproductive and respiratory syndrome virus in vaccinated breeding herds Author: Hepzibar Clilverd Subject: DOI: https://doi.org/10.1093/ve/veae041 Virus Evolution, 10, 1, xx xx xxxx. Abstract: This study investigates the long-term evolutionary dynamics of porcine reproductive and respiratory syndrome virus (PRRSV-1) in an endemically infected and vaccinated pig herd. Over a one year and a half period, piglets from seven farrowing batches in a 300-sow PRRSV-vaccinated farm were monitored from birth to nine weeks of age by reverse transcription-quantitative polymerase chain reaction (RT-qPCR). Eighty-five PRRSV-positive samples were subjected to whole genome sequencing (Illumina Miseq), and 251 samples to open reading frame 5 (ORF5) sequencing. Farm-specific PRRSV variants’ impact on anti-PRRSV antibodies was evaluated using enzyme-linked immunosorbent and neutralizing antibody assays. The replication kinetics and cytokine inhibition capabilities (IFN-α and TNF-α) of these variants were assessed in porcine alveolar macrophages. The study revealed fluctuating PRRSV-1 incidences in farrowing units and nurseries, attributed to two key evolutionary events: an escape variant emergence and a lateral introduction of a new strain. Initially, strain 1 variant α was swiftly replaced within weeks by variant 1β (99.5 per cent genomic similarity), with twenty-five amino acid mutations, primarily in nsp1α, GP2, GP3, and GP5, including an additional glycosylation site and a deletion downstream the neutralization epitope of GP5. This shift to 1β correlated with increased incidence in nurseries and higher viral loads, with sera from 1α-exposed animals showing reduced neutralization against 1β. Consistently for in vitro assays, variant 1β demonstrated enhanced replication in porcine alveolar macrophages but no difference regarding IFN-α or TNF-α responses. Later, a new strain (strain 2, 83.3 per cent similarity to strain 1) emerged and led to incidence resurgence because of the low cross reactivity with the previous antibodies. The study highlights PRRSV’s rapid adaptability and challenges in controlling its spread, underscoring the necessity for more effective vaccines and eradication approaches. Keywords: PRRSV; endemic; viral evolution; persistence; vaccination. 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False application/pdf veae041_icore_preview.tex Hepzibar Clilverd Yanli Li Gerard Martín-Valls Laia Aguirre Marga Martín Martí Cortey Enric Mateu Selection of viral variants with enhanced transmission and reduced neutralization susceptibility alongside lateral introductions may explain the persistence of porcine reproductive and respiratory syndrome virus in vaccinated breeding herds PRRSV; endemic; viral evolution; persistence; vaccination. Text OUP Publishing DOI: https://doi.org/10.1093/ve/veae041 Virus Evolution, 10, 1, xx xx xxxx. Abstract: This study investigates the long-term evolutionary dynamics of porcine reproductive and respiratory syndrome virus (PRRSV-1) in an endemically infected and vaccinated pig herd. Over a one year and a half period, piglets from seven farrowing batches in a 300-sow PRRSV-vaccinated farm were monitored from birth to nine weeks of age by reverse transcription-quantitative polymerase chain reaction (RT-qPCR). Eighty-five PRRSV-positive samples were subjected to whole genome sequencing (Illumina Miseq), and 251 samples to open reading frame 5 (ORF5) sequencing. Farm-specific PRRSV variants’ impact on anti-PRRSV antibodies was evaluated using enzyme-linked immunosorbent and neutralizing antibody assays. The replication kinetics and cytokine inhibition capabilities (IFN-α and TNF-α) of these variants were assessed in porcine alveolar macrophages. The study revealed fluctuating PRRSV-1 incidences in farrowing units and nurseries, attributed to two key evolutionary events: an escape variant emergence and a lateral introduction of a new strain. Initially, strain 1 variant α was swiftly replaced within weeks by variant 1β (99.5 per cent genomic similarity), with twenty-five amino acid mutations, primarily in nsp1α, GP2, GP3, and GP5, including an additional glycosylation site and a deletion downstream the neutralization epitope of GP5. This shift to 1β correlated with increased incidence in nurseries and higher viral loads, with sera from 1α-exposed animals showing reduced neutralization against 1β. Consistently for in vitro assays, variant 1β demonstrated enhanced replication in porcine alveolar macrophages but no difference regarding IFN-α or TNF-α responses. Later, a new strain (strain 2, 83.3 per cent similarity to strain 1) emerged and led to incidence resurgence because of the low cross reactivity with the previous antibodies. The study highlights PRRSV’s rapid adaptability and challenges in controlling its spread, underscoring the necessity for more effective vaccines and eradication approaches. en-US 2024-05-29T17:29:07+05:30 © The Author(s) 2024. Published by Oxford University Press. 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