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MicroRNAs (miRNAs) are a class of non-coding short RNAs with ∼22 nts in length, which play important roles in the regulation of numerous biological processes in animals. In this study, two small RNA libraries from fatty (S01) and normal livers (S02) from Holstein Dairy Cow (HDC) were sequenced through deep sequencing. A total of 12,964,411 and 15,426,289 clean reads were obtained, representing 370 known and 182 novel miRNAs, respectively. The characterization, expression pattern, potential functions and target genes of these miRNAs were investigated. Analysis identified 66 upregulated and seven downregulated differentially expressed miRNAs (DIE-miRNAs). To verify the sequencing results, 10 DIE-miRNAs were selected for qRT-PCR, and the results were confirmed to be consistent with the miRNA sequencing. In addition, a total of 5,578 targets of the 73 DIE-miRNAs were predicted. GO analysis revealed that DIE-miRNAs targets are associated with cellular process, cell part and molecular transducer activity. KEGG pathway analysis showed that Arrhythmogenic right ventricular cardiomyopathy, Axon guidance, Ether lipid metabolism and Cocaine addiction were closely associated with liver metabolism. These findings will provide valuable information for further functional verification of miRNAs between normal and fatty liver, as might exploit new attractive miRNAs biomarkers for diseases detection in HDC.

Identification and analysis of miRNAs in the normal and fatty liver from the Holstein dairy cow