miRNA-seq of lung in two kinds of pig breeds after PCV2 injection

Postweaning multisystemic wasting syndrome in pigs has devastated the swine industry since the 1990s. Porcine circovirus type 2 (PCV2) is the primary cause of this disease. MicroRNAs (miRNAs) are small noncoding RNAs that play important roles in regulating gene expression, especially at the post-transcription level. The expression profiles of miRNAs have been reported in porcine reproductive and respiratory syndrome, porcine parvovirus, and other pig diseases; however, the miRNA expression profiles in pigs infected with PCV2 have not been reported so far. The Laiwu pig (a Chinese indigenous pig breed) has different meat quality, adipogenesis, and disease-resistance from western commercial pig breeds. In this study, four small RNA libraries were constructed from the lung tissue of uninfected and infected Laiwu and Yorkshire/Landrace crossbred (YL) pigs. High-throughput sequencing and bioinformatics were used to determine the abundance and differential expression of miRNAs in the four libraries Overall design: miRNA-seq of four groups as PCV2 infected Laiwu pig (Lw-i), uninfected Laiwu pig (Lw-un), infected western commercial (YL-i) and uninfected western commercial pigs (YL-un)