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X gene and precore region mutations in the hepatitis B virus genome in persons positive for antibody to hepatitis B e antigen: comparison between asymptomatic "healthy" carriers and patients with severe chronic active hepatitis.

Authors
  • Fukuda, R
  • Nguyen, X T
  • Ishimura, N
  • Ishihara, S
  • Chowdhury, A
  • Kohge, N
  • Akagi, S
  • Watanabe, M
  • Fukumoto, S
Type
Published Article
Journal
The Journal of infectious diseases
Publication Date
Nov 01, 1995
Volume
172
Issue
5
Pages
1191–1197
Identifiers
PMID: 7594653
Source
Medline
License
Unknown

Abstract

Hepatitis B virus (HBV) carriers with antibody to hepatitis e antigen comprise asymptomatic carriers (ASCs), who have low replication levels of HBV, and patients with chronic active hepatitis (CAH), who have high levels of viral replication. To investigate whether defects in the X protein might be responsible for this difference in the level of viral replication, nucleotide sequences of X and precore gene regions in serum HBV were analyzed in 19 ASCs and 9 CAH patients. All patients had a point mutation creating a stop codon in the precore region. Seventeen ASCs (87.3%) had identical mutations consisting of 4 noncontiguous 1-bp deletions or an 8-bp deletion, both of which truncate the normal X protein, whereas no CAH patient had an X gene mutation (P < .001). Thus, deletion of the X protein might be responsible for the low levels of viral replication in ASCs.

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