title: Hepatitis D virus infection, replication and cross-talk with the hepatitis B virus.
abstract: Viral hepatitis remains a worldwide public health problem. The hepatitis D virus (HDV) must either coinfect or superinfect with the hepatitis B virus (HBV). HDV contains a small RNA genome (approximately 1.7 kb) with a single open reading frame (ORF) and requires HBV supplying surface antigens (HBsAgs) to assemble a new HDV virion. During HDV replication, two isoforms of a delta antigen, a small delta antigen (SDAg) and a large delta antigen (LDAg), are produced from the same ORF of the HDV genome. The SDAg is required for HDV replication, whereas the interaction of LDAg with HBsAgs is crucial for packaging of HDV RNA. Various clinical outcomes of HBV/HDV dual infection have been reported, but the molecular interaction between HBV and HDV is poorly understood, especially regarding how HBV and HDV compete with HBsAgs for assembling virions. In this paper, we review the role of endoplasmic reticulum stress induced by HBsAgs and the molecular pathway involved in their promotion of LDAg nuclear export. Because the nuclear sublocalization and export of LDAg is regulated by posttranslational modifications (PTMs), including acetylation, phosphorylation, and isoprenylation, we also summarize the relationship among HBsAg-induced endoplasmic reticulum stress signaling, LDAg PTMs, and nuclear export mechanisms in this review.
authors.affiliation: Chi-Ruei Huang, Szecheng John Lo, Institute of Microbiology and Immunology, National Yang-Ming University, Taipei 112, Taiwan.
authors.forename: Chi-Ruei
authors.initials: CR
authors.lastname: Huang
authors.affiliation: Chi-Ruei Huang, Szecheng John Lo, Institute of Microbiology and Immunology, National Yang-Ming University, Taipei 112, Taiwan.
authors.forename: Szecheng John
authors.initials: SJ
authors.lastname: Lo
mesh_terms: D021581:Active Transport, Cell Nucleus; D000818:Animals; D060085:Coinfection; D004279:DNA, Viral / Q000096:biosynthesis; D004721:Endoplasmic Reticulum / Q000378:metabolism / Q000821:virology; D059865:Endoplasmic Reticulum Stress; D006509:Hepatitis B / Q000175:diagnosis / Q000378:metabolism / Q000821:virology*; D006514:Hepatitis B Surface Antigens / Q000378:metabolism; D006515:Hepatitis B virus / Q000378:metabolism / Q000472:pathogenicity*; D003699:Hepatitis D / Q000175:diagnosis / Q000378:metabolism / Q000821:virology*; D003698:Hepatitis Delta Virus / Q000254:growth & development / Q000378:metabolism / Q000472:pathogenicity*; D035923:Hepatitis delta Antigens / Q000378:metabolism; D054884:Host-Pathogen Interactions; D006801:Humans; D011499:Protein Processing, Post-Translational; D012367:RNA, Viral / Q000096:biosynthesis; D015398:Signal Transduction; D015163:Superinfection; D014409:Tumor Necrosis Factor-alpha / Q000378:metabolism; D014779:Virus Replication
chemical_list: D004279:DNA, Viral; D006514:Hepatitis B Surface Antigens; D035923:Hepatitis delta Antigens; D012367:RNA, Viral; D014409:Tumor Necrosis Factor-alpha
keywords: Endoplasmic reticulum stress; Hepatitis B virus; Hepatitis D virus; Nuclear export; Posttranslational modification