Summary
Cytosolic retinoic acid-inducible gene I (RIG-I) is an important innate immune RNA sensor and can induce antiviral cytokines, e.g., interferon-β (IFN-β). Innate immune response to hepatitis B virus (HBV) plays a pivotal role in viral clearance and persistence. However, knowledge of the role that RIG-I plays in HBV infection is limited. The woodchuck is a valuable model for studying HBV infection. To characterize the molecular basis of woodchuck RIG-I (wRIG-I), we analyzed the complete coding sequences (CDSs) of wRIG-I, containing 2778 base pairs that encode 925 amino acids. The deduced wRIG-I protein was 106.847 kD with a theoretical isoelectric point (pI) of 6.07, and contained three important functional structures [caspase activation and recruitment domains (CARDs), DExD/H-box helicases, and a repressor domain (RD)]. In woodchuck fibroblastoma cell line (WH12/6), wRIG-I-targeted small interfering RNA (siRNA) down-regulated RIG-I and its downstrean effector–IFN-β transcripts under RIG-I’ ligand, 5’-ppp double stranded RNA (dsRNA) stimulation. We also measured mRNA levels of wRIG-I in different tissues from healthy woodchucks and in the livers from woodchuck hepatitis virus (WHV)-infected woodchucks. The basal expression levels of wRIG-I were abundant in the kidney and liver. Importantly, wRIG-I was significantly up-regulated in acutely infected woodchuck livers, suggesting that RIG-I might be involved in WHV infection. These results may characterize RIG-I in the woodchuck model, providing a strong basis for further study on RIG-I-mediated innate immunity in HBV infection.
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This project was supported by grants from the National Science and Technology Major Project for Infectious Diseases of China (No. 2012ZX10004503), the National Natural Science Foundation of China (No. 81101248, No. 81261120397 and No. 81371828), and the Deutsche Forschungs-gemeinschaft (Transregio TRR60).
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Yan, Q., Liu, Q., Li, Mm. et al. Molecular cloning, characterization and expression analysis of woodchuck retinoic acid-inducible gene I. J. Huazhong Univ. Sci. Technol. [Med. Sci.] 36, 335–343 (2016). https://doi.org/10.1007/s11596-016-1588-5
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DOI: https://doi.org/10.1007/s11596-016-1588-5