期刊
VIROLOGY
卷 573, 期 -, 页码 39-49出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.virol.2022.06.004
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资金
- Agriculture and Food Research Initiative competitive grant - USDA National Institute of Food and Agriculture [2015-67015-22969]
- Wellcome Trust [106207, 220814]
- Wellcome Trust
In this study, a newly emerged variant of PRRSV was characterized, and its genomic features and genetic variations contributing to enhanced growth fitness were analyzed. This finding is of significance in understanding the epidemiology of PRRSV and developing vaccines.
In this study, we characterized an emerging porcine reproductive and respiratory syndrome virus (PRRSV) isolate UIL21-0712, which is a lineage 1C variant with ORF5 restriction fragment length polymorphism (RFLP) cutting pattern of 1-4-4. The UIL21-0712 genome sequence has 85.3% nucleotide identity with the prototypic PRRSV-2 strain VR2332. The nsp2 region is the most variable, and the-2/-1 programmed ribosome frameshifting (PRF) signal therein is distinct from historical PRRSV strains. Analysis of PRRSV sequences in GenBank revealed that the majority of the emerging PRRSV variants contain substitutions that disrupt the-1 PRF stop codon to generate a nsp2N protein with a C-terminal extension. Two of the-1 PRF stop codon variant patterns were identified to be predominantly circulating in the field. They demonstrated higher growth kinetics than the other variants, suggesting that the most dominant-1 PRF stop codon variant patterns may provide enhanced growth fitness for the virus.
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