Uncovering the Roles of miR-214 in Hepatitis E Virus Replication.

Viral pathogenesis is a complex event and its regulation involve dynamic interactions with various host factors, of which microRNAs are the key players. In the current study, we have identified the functional importance of an interplay between hepatitis E virus (HEV) and miR-214. Computational analysis indicated that miR-214 binding site is significantly conserved among HEV and related RNA viruses. Intact miR-214 binding site is imperative for HEV replication. miR-214 is an essential host factor for HEV replication. Herein, we demonstrate that miR-214 interacts directly with HEV RNA to enhance HEV replication and HEV genome translation. Augmented translation results in increased levels of HEV ORF2, which is a factor responsible for upregulation of miR-214. HEV usurps host cellular machinery for improving viral fitness and elevates miR-214 expression for amplifying the expression of proviral host factor intracellular active thrombin. This is because miR-214 represses the expression of the negative regulator of thrombin, i.e., protein C. Another viral factor, HEV ORF3, also contributes to the enhancement of intracellular active thrombin. Furthermore, miR-214 directly targets antiviral host factor 2'-5'-oligoadenylate synthetase. Conclusively, we identified a novel mechanism of positive regulation of HEV replication. miR-214 interacts directly with HEV genome and fine-tunes host factors expression. This results in outweighing the proviral factors on the proviral-antiviral axis probably for generating virus supportive environment.

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