Data/hora: 08/06/2024 12:35:18

Provedor de dados: 	55	
País: 	Brazil	
Título: 	Mutations in the S gene and in the overlapping reverse transcriptase region in chronic hepatitis B Chinese patients with coexistence of HBsAg and anti-HBs	
Autores: 	Ding,Feng; Miao,Xi-Li; Li,Yan-Xia; Dai,Jin-Fen; Yu,Hong-Gang.	
Data: 	2016-02-01	
Ano: 	2016	
Palavras-chave: 	Chronic hepatitis B; Coexistence of HBsAg and anti-HBs; S gene; Reverse transcriptase.	
Resumo: 	Abstract  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 aa variability in several key areas of HBV genome. Additional research on these genetic mutants are needed to clarify their biological significance for viral persistence.	
Tipo: 	Info:eu-repo/semantics/article	
Idioma: 	Inglês	
Identificador: 	http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-86702016000100001	
Editor: 	Brazilian Society of Infectious Diseases	
Relação: 	10.1016/j.bjid.2015.08.014	
Formato: 	text/html	
Fonte: 	Brazilian Journal of Infectious Diseases  v.20 n.1 2016	
Fonte: 	info:eu-repo/semantics/openAccess