期刊
BRAZILIAN JOURNAL OF INFECTIOUS DISEASES
卷 20, 期 1, 页码 1-7出版社
ELSEVIER BRAZIL
DOI: 10.1016/j.bjid.2015.08.014
关键词
Chronic hepatitis B; Coexistence of HBsAg and anti-HBs; S gene; Reverse transcriptase
资金
- National Natural Science Foundation of China [81272693]
Background: The mechanism underlying the coexistence of hepatitis B surface antigen and antibodies to HBsAg in chronic hepatitis B patients remains unknown. Aims: This research aimed to determine the clinical and virological features of the rare pattern. Methods: A total of 32 chronic hepatitis B patients infected by HBV genotype C were included: 15 carrying both HBsAg and anti-HBs (group I) and 17 solely positive for HBsAg (group II). S gene and reverse transcriptase region sequences were amplified, sequenced and compared with the reference sequences. Results: The amino acid variability within major hydrophilic region, especially the a determinant region, and within reverse transcriptase for regions overlapping the major hydrophilic region in group I is significantly higher than those in group II. Mutation sI126S/T within the a determinant was the most frequent change, and only patients from group I had the sQ129R, sG130N, sF134I, sG145R amino acid changes, which are known to alter immunogenicity. Conclusions: In chronic patients, the concurrent HBsAg/anti-HBs serological profile is associated with an increased as variability in several key areas of HBV genome. Additional research on these genetic mutants are needed to clarify their biological significance for viral persistence. (C) 2015 Elsevier Editora Ltda. All rights reserved.
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