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Differentially expressed miRNAs and tRNA genes effect host homeostasis during highly pathogenic PRRSV infections in young pigs

posted on 2024-06-11, 07:12 authored by Building 20 Room 2819 Mail Stop 2S-209, Virus and Prion Research Unit, USDA-ARS-National Animal Disease Center
Background: Porcine respiratory and reproductive syndrome virus (PRRSV) is a single stranded RNA virus member that infects pigs and causes losses to the commercial industry reaching upwards of a billion dollars annually in combined direct and indirect costs. The virus can be separated into etiologies that contain multiple heterologous low and highly pathogenic strains. Recently the United States has begun to see an increase in heterologous type 2 PRRSV strains of higher virulence (HP-PRRSV). The high pathogenicity of these strains can drastically alter host immune responses and the ability of the animal to maintain homeostasis. Because the loss of host homeostasis can denote underlying changes in gene and regulatory element expression profiles, the study aimed to examine the effect PRRSV infections has on miRNA and tRNA expression and the roles they play in host tolerance or susceptibility. Results: Using transcriptomic analysis of whole blood taken from control and infected pigs at several timepoints (1, 3, 8 dpi), the analysis returned a total of 149 statistically significant (FDR ⫹ 0.15) miRNAs (n=89) and tRNAs (n=60) that were evaluated for possible pro and anti-viral effects. The tRNA differential expression increased in both magnitude and count as dpi increased, with no statistically significant expression at 1 dpi. The most abundant tRNA amino acid at 3 dpi was alanine , while glycine was the most abundant at 8 dpi. For the miRNAs, focus was put on upregulation that can inhibit gene expression. These results yielded candidates with potential anti and pro-viral actions such as Ssc-miR-125b, which is predicted to limit PRRSV viral levels, and Ssc-miR-145-5p shown to cause alternative macrophage priming. The results also showed that both the tRNA and miRNA displayed expression patterns Conclusions: The results indicated that the HP-PRRSV infection effects host homeostasis at the epigenetic level through changes in miRNA and tRNA expression and their subsequent gene interactions, that target and influence the function of host immune, metabolic, and structural pathways. Overall design: 24 9-week old pigs seperated into 2 treatment groups (HP-PRRSV and control) and 3 timepoints (1,3,8 dpi)


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National Center for Biotechnology Information

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  • Non-geospatial

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  • biota

National Agricultural Library Thesaurus terms

transcriptome; gene expression

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  • Public

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It is recommended to cite the accession numbers that are assigned to data submissions, e.g. the GenBank, WGS or SRA accession numbers. If individual BioProjects need to be referenced, state that "The data have been deposited with links to BioProject accession number PRJNA501878 in the NCBI BioProject database ("

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