HBV Mutation Detail Information

Virus Mutation HBV Mutation D144E


Basic Characteristics of Mutations
Mutation Site D144E
Mutation Site Sentence However, multiple HBV vaccine-escape mutations (sS143T + sD144E + sG145R + sE164D + sI195M) have been determined on the HBV overlapping pol/S gene region.
Mutation Level Amino acid level
Mutation Type Nonsynonymous substitution
Gene/Protein/Region S
Standardized Encoding Gene S  
Genotype/Subtype -
Viral Reference -
Functional Impact and Mechanisms
Disease Hepatitis B, Chronic    
Immune -
Target Gene -
Clinical and Epidemiological Correlations
Clinical Information -
Treatment -
Location -
Literature Information
PMID 23971933
Title [HBV vaccine escape mutations in a chronic hepatitis B patient treated with nucleos(t)ide analogues]
Author Sayan M,Bugdaci MS
Journal Mikrobiyoloji bulteni
Journal Info 2013 Jul;47(3):544-9
Abstract The hepatitis B virus (HBV) polymerase (pol) gene completely overlaps with the envelope (S) gene. Nucleos(t)ide analogue (NA) resistance mutations in the pol gene of HBV, either from selection of primary or secondary resistance mutations, typically result in changes in the overlapping hepatitis B surface antigen (HBsAg). Recent studies have conferred a new acronym to these HBV pol/S gene overlap mutants; ADAPVEMs, for antiviral drug-associated potential vaccine-escape mutants. The present report aimed to assess the determined multiple HBV vaccine-escape mutants in a Turkish patient with chronic hepatitis B (CHB), undergoing NAs treatment. The liver biopsy of HBsAg positive, HBeAg negative 53-year old female patient with CHB, revealed a score as histological activity index; 9 and fibrosis; 2 according to Ishak classification. NA treatment backgrounds consisted of 24 months lamivudine, followed by 18 months entacavir and lastly 3 months tenofovir monotherapies. Since HBV DNA load was determined as 7.030.000 IU/ml at the 4th month of tenofovir therapy, entecavir was added as current treatment regimen, and tenofovir + entecavir therapy decreased the HBV DNA load (400 IU/ml). Sequence analysis was performed for HBV pol/S gene and overlapping pol/S gene amino acid substitutions, primary/compensatory NA resistance mutations and antiviral drug-associated potential vaccine-escape mutations (ADAPVEM) were analysed. The patient isolate was identified as genotype D/subgenotype D1 of HBV. Primary drug resistance mutations (rtV173L + rtL180M + rtM204V) to lamivudine and telbivudine and a compensatory mutation (rtQ215H) to lamivudine and adefovir were described in the HBV pol gene sequence. However, multiple HBV vaccine-escape mutations (sS143T + sD144E + sG145R + sE164D + sI195M) have been determined on the HBV overlapping pol/S gene region. Lamivudine and telbivudine which are the frequently preferred drugs for the treatment of CHB in Turkey, have the potential to lead to ADAPVEMs. Thus ADAPVEMs should be monitored in infected and NA treated CHB patients and their public health risks should be assessed.
Sequence Data -
Mutation Information
Note
Basic Characteristics of Mutations
  • Mutation Site: The specific location in a gene or protein sequence where a change occurs.
  • Mutation Level: The level at which a mutation occurs, including the nucleotide or amino acid level.
  • Mutation Type: The nature of the mutation, such as missense mutation, nonsense mutation, synonymous mutation, etc.
  • Gene/Protein/Region: Refers to the specific region of the virus where the mutation occurs. Including viral genes, viral proteins, or a specific viral genome region. If the article does not specifically indicate the relationship between the mutation and its correspondence, the main
  • Gene/Protein/Region studied in the article is marked.
  • Genotype/Subtype: Refers to the viral genotype or subtype where the mutation occurs. If the article does not specifically indicate the relationship between the mutation and its correspondence, the main Genotype/Subtype studied in the article is marked.
  • Viral Reference: Refers to the standard virus strain used to compare and analyze viral sequences.
Functional Impact and Mechanisms
  • Disease: An abnormal physiological state with specific symptoms and signs caused by viral infection.
  • Immune: The article focuses on the study of mutations and immune.
  • Target Gene: Host genes that viral mutations may affect.
Clinical and Epidemiological Correlations
  • Clinical Information: The study is a clinical or epidemiological study and provides basic information about the population.
  • Treatment: The study mentioned a certain treatment method, such as drug resistance caused by mutations. If the study does not specifically indicate the relationship between mutations and their correspondence treatment, the main treatment studied in the article is marked.
  • Location: The source of the research data.
Literature Information
  • Sequence Data: The study provides the data accession number.