title: Full-length hepatitis B virus sequences from naïve patients with fluctuation of viral load during ADV monotherapy.
abstract: The reasons for adefovir dipivoxil (ADV) treatment failures appear diverse. Few studies have reported full-length hepatitis B virus (HBV) genome in patients with ADV treatment failures. The patients were from a phase III clinical trial that investigated the antiviral response to ADV in China. Seven patients had increase in HBV-DNA (>1 log(10) copies/ml above on-treatment nadir) at week 52. The serum HBV-DNA levels were above 10(4)copies/ml at week 92 in four of them. Sixteen full-length HBV genomes from the four patients at four time points were sequenced using cloning sequencing method. The frequency of substitutions at week 52 was higher than at weeks 28(16 wt) and 92(80). HBV-DNA reduction was correlated negatively with the frequency of substitutions at the three time points. No published ADV-resistant mutations were detected. The mutations, including substitutions in immunogenic epitopes and conserved sites of the polymerase gene, were frequent during ADV treatment. Amino acid deletions in X gene and basal core promoter/pre-core mutations appeared before or during ADV treatment. The substitutions in immunogenic epitopes (mainly of the surface gene) and conserved sites of the polymerase gene other than ADV-resistant mutations may have influenced antiviral efficacy in the study. More potent antiviral drugs may be important to rescue individual patients and for public health safety. It is needed to study how these substitutions influence HBV replication, disease progression, and antiviral treatment efficacy.
authors.affiliation: Department of Infectious Diseases, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, China.
authors.forename: Yongwei
authors.initials: Y
authors.lastname: Li
authors.forename: Mingfen
authors.initials: M
authors.lastname: Zhu
authors.forename: Yunwei
authors.initials: Y
authors.lastname: Guo
authors.forename: Wei
authors.initials: W
authors.lastname: Chen
authors.forename: Gang
authors.initials: G
authors.lastname: Li
mesh_terms: D000225:Adenine / Q000031:analogs & derivatives* / Q000627:therapeutic use; D000328:Adult; D019943:Amino Acid Substitution; D000998:Antiviral Agents / Q000627:therapeutic use*; D002681:China; D004279:DNA, Viral / Q000097:blood / Q000737:chemistry / Q000235:genetics*; D005260:Female; D016679:Genome, Viral; D006515:Hepatitis B virus / Q000235:genetics* / Q000302:isolation & purification*; D019694:Hepatitis B, Chronic / Q000188:drug therapy* / Q000821:virology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D020125:Mutation, Missense; D063065:Organophosphonates / Q000627:therapeutic use*; D017422:Sequence Analysis, DNA; D017384:Sequence Deletion; D017211:Treatment Failure; D019562:Viral Load; D014764:Viral Proteins / Q000235:genetics; D055815:Young Adult
chemical_list: D000998:Antiviral Agents; D004279:DNA, Viral; D063065:Organophosphonates; D014764:Viral Proteins; D000225:Adenine; C106812:adefovir dipivoxil