Abstract
MicroRNAs (miRNAs) are small non-coding RNAs with approximately 22 nucleotides (nt) that are encoded by a diverse range of metazoan eukaryotes, plants and viruses. CyHV-3 (cyprinid herpesvirus-3) is a member of the Alloherpesviridae virus family and has caused severe economic losses for the common carp and koi carp fishery industries. In this study, a total of 15,987,652 clean reads were generated from a cDNA library of CyHV-3-infected KCF-1 (koi caudal fin) cells using high-throughput sequencing technology. Following annotation and secondary structure prediction, 28 miRNAs were identified as novel candidate miRNAs encoded by common carp (Cyprinus carpio), and seven miRNAs were shown to be encoded by CyHV-3. Next, 19 host miRNAs and seven viral miRNAs were validated by stem-loop real-time PCR. Northern blot analysis confirmed the presence of 14 host miRNAs and five CyHV-3-encoded novel miRNAs. The results of this study expand the knowledge of common carp and CyHV-3 microRNAs and provide a useful theoretical foundation for further study of CyHV-3.
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