title: Prevalence and type of precore hepatitis B virus mutants in hepatitis D virus superinfection and its clinical implications.
abstract: To study the prevalence and type of the hepatitis B e antigen (HBeAg)-negative mutant in hepatitis D virus (HDV) superinfection, the precore region of hepatitis B virus (HBV) was analyzed by cycle sequencing. Of the 58 samples sequenced, 24 were wild type and 34 carried mutants. The precore stop mutation (TAG) at the 28th codon was found in 32 cases, other mutations were found in 7, and double mutations were found in 5. The absence of HBeAg showed a substantial agreement with the presence of mutants (kappa value, 0.74). Of the acute hepatitis patients, HDV replication and clinical manifestations were not significantly different between those with mutant and wild type virus, except that those with mutant virus were older (mean age, 48 vs. 28 years; P < .002). The absence of HBeAg in these patients is mainly due to HDV superinfection in older HBV carriers who already had precore mutant.
authors.affiliation: Department of Medicine, Veterans General Hospital, National Yang-Ming University School of Medicine, Taipei, Taiwan.
authors.forename: J C
authors.initials: JC
authors.lastname: Wu
authors.forename: C M
authors.initials: CM
authors.lastname: Chen
authors.forename: T Z
authors.initials: TZ
authors.lastname: Chen
authors.forename: S D
authors.initials: SD
authors.lastname: Lee
authors.forename: F S
authors.initials: FS
authors.lastname: Yen
authors.forename: K B
authors.initials: KB
authors.lastname: Choo
mesh_terms: D000208:Acute Disease; D000328:Adult; D001483:Base Sequence; D002908:Chronic Disease; D004279:DNA, Viral / Q000032:analysis; D018963:Hepatitis Antigens / Q000032:analysis; D006509:Hepatitis B / Q000276:immunology / Q000503:physiopathology / Q000821:virology*; D006512:Hepatitis B Core Antigens / Q000032:analysis* / Q000235:genetics; D006513:Hepatitis B e Antigens / Q000235:genetics; D006515:Hepatitis B virus / Q000235:genetics* / Q000276:immunology; D003699:Hepatitis D / Q000276:immunology / Q000503:physiopathology / Q000821:virology*; D003698:Hepatitis Delta Virus / Q000235:genetics* / Q000276:immunology; D035923:Hepatitis delta Antigens; D006801:Humans; D008099:Liver / Q000821:virology; D008875:Middle Aged; D008969:Molecular Sequence Data; D009154:Mutation; D016133:Polymerase Chain Reaction; D015995:Prevalence; D012367:RNA, Viral / Q000032:analysis; D015163:Superinfection / Q000276:immunology / Q000503:physiopathology / Q000821:virology*
chemical_list: D004279:DNA, Viral; D018963:Hepatitis Antigens; D006512:Hepatitis B Core Antigens; D006513:Hepatitis B e Antigens; D035923:Hepatitis delta Antigens; D012367:RNA, Viral; C442244:hepatitis delta virus large antigen