Navegando por Autor "SOARES, Luana da Silva"

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Análise molecular dos genes VP4, VP7 e NSP4 de rotavírus do tipo G1 circulantes em Belém e Marituba, Pará, Brasil, de 1982 a 2008
(Universidade Federal do Pará, 2011) SOARES, Luana da Silva; MASCARENHAS, Joana D'Arc Pereira; http://lattes.cnpq.br/5156164089432435; LINHARES, Alexandre da Costa; http://lattes.cnpq.br/3316632173870389
Rotaviruses are major viral agents of acute gastroenteritis and responsible for 36% of hospitalization for diarrhea among children less than five years of age, resulting in 453.000 deaths annually, mostly in developing countries. Rotavirus is a member of Reoviridae family, and its genome consists of 11 double-stranded RNA (dsRNA) which encode 12 proteins. G1 rotavirus is commonly detected in epidemiological investigations, occurring under different prevalence rates. The aim of this study was to analyze the VP4, VP7 and NSP4 diversity genetic of G1 rotavirus circulating in Belém and Marituba, Pará, Brazil, from 1982 to 2008. We selected 83 samples previously characterized as G1 type and submitted to RT-PCR. The samples were from seven studies conducted in IEC. It was possible amplification for 63 (75.9%) specimens. Lineages 1 (8/63, 12.7%), 2 (29/63, 46.0%), 3 (18/63, 28.6%) and 9 (8/63, 12.7%) of VP7 gene were detected. The sublineages 2E and 3A were co-predominant detected in 57.1% (36/63) of samples. Three amino acid substitutions (97 [D→E], 147 [S→N] and 218 [I→V]) were observed in VP7 antigenic regions (A, B and C) in samples of 1, 2 and 9 lineages. All samples showed P[8] specificity for VP4 gene and lineages 2 (21/63, 33.3%) and 3 (42/63, 66.7%) were detected. Two substitutions (35 [I→V] and 38 [S→G]) occurred in antigenic region of VP4 of samples analyzed. For NSP4 gene, all samples belonged to E1 type. Phylogenetic analysis of NSP4 gene revealed that occurred changes in nucleotide positions 47 (C→T) and 101 (T→C), resulting in amino acid substitutions at positions 16 (S→P) and 34 (L → P) in all samples and 9 specimens displayed amino acid substitution in NSP4 toxicity residue (aa 131). This study allowed us to broaden our understanding about genetic diversity and circulation of G1 variants and represents the first molecular epidemiology analyze of this genotype in Brazil corroborating the high heterogeneity of this genotype.
Acesso aberto (Open Access)
Caracterização antigênica e molecular de amostras de rotavírus do tipo G1, obtidas de crianças participantes de estudos em gastroenterites virais, no período de 1982 a 2003, em Belém, Pará, Brasil
(Universidade Federal do Pará, 2006-07-03) SOARES, Luana da Silva; MASCARENHAS, Joana D'Arc Pereira; http://lattes.cnpq.br/5156164089432435; LINHARES, Alexandre da Costa; http://lattes.cnpq.br/3316632173870389
Infant mortality remains an important problem of public health worldwide, mainly in developing countries. Of more than the 50 etiologic agents implied in this disease, rotavirus causes 111 million episodes of diarrhoea, resulting in more than 600,000 deaths among children less than five years, of which 82% are notified in the poorest countries of the world. This study aimed at the antigenic and molecular characterization of G1 rotavirus strains among children participanting of viral gastroenteritis studies, carried out from 1982 to 2003, in Belém, Pará, Brazil. One hundred and forty-eight specimens of G1 rotavirus were analyzed in the present investigation. Overall, the prevalence of the G1 type was of 41.3%, being that frequencies of this genotype through studies ranged from 11.0% to 67.6%. Eletropherotypes, G serotypes and P genotypes characterization of G1 rotavirus occurred in frequencies of 78.4%, 89.9% and 87.8%, respectively. Three long eletropherotypes varieties were identified, being that the L1 variety was found frequently (79.3%). The G1, G9 and G1+G4 serotypes were detected in 88.0%, 9.8% and 2.2% of the specimens, respectively. Mixed infection by G1+G4 genotype was detected in one sample. The prevalent binary combination was P[8],G1, being responsible for 72.3% of the cases. Mixed infections circulated in percentage of 20.0%, including genotypes P[4]+P[8],G1, P[6]+P[8],G1, P[4]+P[6],G1, P[4]+P[6]+P[8],G1 and P[6]+P[8],G1+G4. The G1 genotype circulated among 2nd to 35th months of age and a highest number of cases was registered between 6 to 16 months of age. Clinical severity differences among G1 and other genotypes of rotavirus were not verified. The present analysis gathers pioneer findings in Brazil, allowing to extend the knowledge concerning the antigenic and molecular diversity of the infections by G1 rotavirus and these results will allow to understand the genetic complexity of such viral agents.
Acesso aberto (Open Access)
Sapoviruses in children with acute gastroenteritis from Manaus, Amazon region, Brazil, 2010-2011
(Universidade Federal do Pará, 2016-11-03) REYMÃO, Tammy Kathlyn Amaral; HERNANDEZ, Juliana das Merces; COSTA, Samya Thalita Picanço da; SOUSA, Maisa Silva de; OLIVEIRA, Darleise de Souza; SILVA, Luciana Damascena da; BANDEIRA, Renato da Silva; LIMA, Ian Carlos Gomes de; SOARES, Luana da Silva; MASCARENHAS, Joana D'Arc Pereira; GABBAY, Yvone Benchimol
Sapoviruses (SaVs) are responsible for acute gastroenteritis in humans, especially children and the elderly. In Brazil, data on SaVs infections are very limited, especially in Northern Brazil. Here, we investigated the occurrence of SaVs in samples from hospitalized children under ten years old that presented acute gastroenteritis. Positive samples were genotyped and phylogenetic analysis was performed using prototype strains sequences obtained from GenBank database. In total, 156 fecal samples were screened by RT-PCR for SaVs. A positivity rate of 3.8% (6/156) was found in children under three years of age. Four genotypes were detected: GI.I, GI.2 and GII.2?-GII.4?/GII.4, suggesting a possible inter-genotypes recombination. Most infections (83.3%) occurred between August and September. The positivity was similar to that found in other countries and genotyping demonstrated the presence of distinct genotypes. To our knowledge, this is the first study reporting the circulation of SaVs in Manaus, state of Amazonas, Amazon region, Brazil.