[Detection of mutants of the "a" determinant region of hepatitis B surface antigen S gene among Wuhan childhood patients].
Zhonghua Gan Zang Bing Za Zhi
; 13(8): 594-6, 2005 Aug.
Article
em Zh
| MEDLINE
| ID: mdl-16092983
ABSTRACT
OBJECTIVE:
To investigate whether the presence of HBV mutant in vaccinees simply reflects the prevalence of HBV mutant in a specific geographic area or is indeed due to the immune pressure induced by vaccination.METHODS:
HBV S genes were amplified by using polymerase chain reaction (PCR) and DNA sequence analysis of the "a" determinant was performed on sera from 30 childhood patients with immunoprophylaxis and 30 patients without vaccinations.RESULTS:
Mutations of the "a" determinant were detected in 8 of the 60 patients. They were all of the adw subtype. The prevalence of amino acid substitutions as detected by direct sequencing was higher in those fully-vaccinated than of those not vaccinated. In all 8 vaccinated and also with detectable mutants, the mean age was older than the other vaccinated children.CONCLUSION:
The prevalence of mutants is related to HBV subtypes and genotypes. Universal vaccination has accelerated an accumulation of HBsAg "a" determinant mutants with amino acid changes critical for immune escape in vaccinated children who became carriers. This suggests that new vaccination strategies should be considered.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Mutação Puntual
/
Vacinas contra Hepatite B
/
Antígenos de Superfície da Hepatite B
/
Epitopos
Tipo de estudo:
Diagnostic_studies
/
Risk_factors_studies
Limite:
Child
/
Female
/
Humans
/
Male
País/Região como assunto:
Asia
Idioma:
Zh
Revista:
Zhonghua Gan Zang Bing Za Zhi
Assunto da revista:
GASTROENTEROLOGIA
Ano de publicação:
2005
Tipo de documento:
Article
País de afiliação:
China