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Spontaneous HBsAg loss in Korean patients: relevance of viral genotypes, S gene mutations, and covalently closed circular DNA copy numbers
Clinical and Molecular Hepatology ; : 251-260, 2014.
Artigo em Inglês | WPRIM | ID: wpr-106801
ABSTRACT
BACKGROUND/

AIMS:

Occult HBV infection can persist following HBsAg loss and be transmitted, but the virological features are not well defined.

METHODS:

Here we investigated 25 Korean patients who lost HBsAg during follow up, either spontaneously or subsequent to therapy.

RESULTS:

Whereas subtype adr (genotype C) was found in 96% of HBsAg positive patients, 75 % of patients who lost HBsAg spontaneously were seemed to be infected with the ayw subtype with sequence similar to genotype D. Mutations in the major hydrophilic region (MHR) of HBsAg were found in 7 patients who lost HBsAg spontaneously. The mutations include T123S, M125I/N, C139R, D144E, V177A, L192F, and W196L, some of which have not been reported before. Functional analysis via transfection experiments indicate that the C139R and D144E mutations drastically reduced HBsAg antigenicity, while the Y225del mutation found in one interferon-treated patient impaired HBsAg secretion.

CONCLUSIONS:

Lack of detectable HBsAg in patient serum could be explained by low level of ccc DNA in liver tissue, low antigenicity of the surface protein, or its secretion defect.
Assuntos

Texto completo: DisponíveL Índice: WPRIM (Pacífico Ocidental) Assunto principal: Antivirais / Remissão Espontânea / DNA Circular / Dados de Sequência Molecular / Sorotipagem / Vírus da Hepatite B / Sequência de Aminoácidos / Células Hep G2 / República da Coreia / Genótipo Limite: Adulto / Idoso / Feminino / Humanos / Masculino País/Região como assunto: Ásia Idioma: Inglês Revista: Clinical and Molecular Hepatology Ano de publicação: 2014 Tipo de documento: Artigo

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Texto completo: DisponíveL Índice: WPRIM (Pacífico Ocidental) Assunto principal: Antivirais / Remissão Espontânea / DNA Circular / Dados de Sequência Molecular / Sorotipagem / Vírus da Hepatite B / Sequência de Aminoácidos / Células Hep G2 / República da Coreia / Genótipo Limite: Adulto / Idoso / Feminino / Humanos / Masculino País/Região como assunto: Ásia Idioma: Inglês Revista: Clinical and Molecular Hepatology Ano de publicação: 2014 Tipo de documento: Artigo