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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Distribution of HBV subgenotypes in Ribeirão Preto, Southeastern Brazil: a region with history of intense Italian immigration

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Florencio Chacha, Silvana Gama ; Gomes-Gouvea, Michele Soares ; Malta, Fernanda de Mello ; Ferreira, Sandro da Costa ; Villanova, Marcia Guimaraes ; Souza, Fernanda Fernandes ; Teixeira, Andreza Correa ; da Costa Passosd, Afonso Dinis ; Rebello Pinho, Joao Renato ; Candolo Martinelli, Ana de Lourdes
Total Authors: 10
Document type: Journal article
Source: Brazilian Journal of Infectious Diseases; v. 21, n. 4, p. 424-432, JUL-AUG 2017.
Web of Science Citations: 4

Abstract Hepatitis B virus (HBV) is distributed worldwide, with geographical variations regarding prevalence of the different genotypes. The aim of this study was to determine the HBV genotypes and subgenotypes circulating in Southeast Brazil and compare the genetic sequences found with HBV sequences previously described in the world. Sequences from 166 chronic HBV carriers were analyzed using the fragment constituted by 1306 base pairs comprising surface and polymerase regions of the HBV genome. The sequences obtained were submitted to phylogenetic analysis. HBV subgenotypes A1, A2, D1-D4, F2a, and F4 were found. HBV genotype D was the most frequent, found in 99 patients (58.4%). Within this group, subgenotype D3 was the most prevalent, in 73 patients (42.9%). HBV genotype A was identified in 58 (36%) patients, subgenotype A1, in 48 (29.8%) subjects. Genotype F was identified in 9 (5.4%). According to the phylogenetic analysis, the sequences found were grouped with sequences from Europe, Asia and Middle East (subgenotypes D1, D2, D3) and sequences from Latin America and Africa (subgenotype A1). HBV D3 grouped in different clusters inside D3 clade, several of them with sequences isolated in Italy. We also identified eight families whose relatives were infected with the same HBV subgenotype, most with high similarity between sequences. In conclusion, the distribution of the HBV sequences obtained interweaved with sequences from other continents, corresponding to regions from where many immigrants came to this region, in accordance to the hypothesis that the HBV detected over there were brought during the colonization times. (AU)

FAPESP's process: 08/11472-2 - Study of the role of hepatitis B virus (HBV) genotypes on clinical outcome, severity of liver disease and response to treatment in chronic HBV infection
Grantee:Ana de Lourdes Candolo Martinelli
Support Opportunities: Regular Research Grants