ROBERTA MARCATTI DE AZEVEDO

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LIM/46 - Laboratório de Parasitologia Médica, Hospital das Clínicas, Faculdade de Medicina

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  • article 8 Citação(ões) na Scopus
    Genomic constellation of human Rotavirus A strains identified in Northern Brazil: a 6-year follow-up (2010-2016)
    (2020) SILVA-SALES, Marcelle; LEAL, Elcio; MILAGRES, Flavio Augusto de Padua; BRUSTULIN, Rafael; MORAIS, Vanessa dos Santos; MARCATTI, Roberta; ARAUJO, Emerson Luiz Lima; WITKIN, Steven S.; DENG, Xutao; SABINO, Ester Cerdeira; DELWART, Eric; LUCHS, Adriana; COSTA, Antonio Charlys da
    Surveillance of Rotavirus A (RVA) throughout the national territory is important to establish a more complete epidemiological-molecular scenario of this virus circulation in Brazil. The aim of the present study was to investigate the genetic diversity of RVA strains circulating in Tocantins State (Northern Brazil) during six years of post-vaccination followup (2010-2016). A total of 248 stool samples were screened by next generation sequencing and 107 (43.1%) nearly full length RVA genome sequences were obtained; one sample was co-infected with two RVA strains (G2/G8P[4]). Six G and P genotypes combinations were detected: G12P[8] strains (78.6%). as well as the G3P[8] (9.3%) and G1P[8] (0.9%) were associated with a Wa-like genogroup backbone. All G21 3 [4] (5.6%) and G8P[41 (2.8%) strains, including the mixed G2/G81 3 141 infection (0.9%) showed the DS-1-like genetic background. The two G12P[4] strains (1.9%) were associated with distinct genetic backbones: Wa-like and DS-1-like. The phylogenetic analysis revealed the circulation of lineages G1-I, G2-IV, G3-11E, G8-I and G12-111, and P[4]-V and P[8]-Ill of the VP7 and VP4 genes, respectively. Conserved clustering pattern and low genetic diversity were observed regarding VP1-VP3 and VP6, as well as NSP1-5 segments. We identified the same RVA circulation pattern reported in other Brazilian regions in the period of 2010-2016, suggesting that rural and low-income areas may not have a different RVA genotypic distribution compared to other parts of the country. The unique presentation of whole-genome data of RVA strains detected in the Tocantins State provides a baseline for monitoring variations in the genetic composition of RVA in this area.
  • article 5 Citação(ões) na Scopus
    Adaptive Evolution of New Variants of Dengue Virus Serotype 1 Genotype V Circulating in the Brazilian Amazon
    (2021) RIBEIRO, Geovani de Oliveira; GILL, Danielle Elise; RIBEIRO, Edcelha Soares D. Athaide; MONTEIRO, Fred Julio Costa; MORAIS, Vanessa S.; MARCATTI, Roberta; REGO, Marlisson Octavio da S.; ARAUJO, Emerson Luiz Lima; WITKIN, Steven S.; VILLANOVA, Fabiola; DENG, Xutao; SABINO, Ester Cerdeira; DELWART, Eric; LEAL, Elcio; COSTA, Antonio Charlys da
    Dengue virus (DENV) is a mosquito-borne viral pathogen that plagues many tropical-climate nations around the world, including Brazil. Molecular epidemiology is a growing and increasingly invaluable tool for understanding the dispersal, persistence, and diversity of this impactful virus. In this study, plasma samples (n = 824) from individuals with symptoms consistent with an arboviral febrile illness were analyzed to identity the molecular epidemiological dynamics of DENV circulating in the Brazilian state of Amapa. Twelve DENV type 1 (DENV-1) genomes were identified, which were phylogenetically related to the BR4 lineage of genotype V. Phylodynamics analysis suggested that DENV-1 BR-4 was introduced into Amapa around early 2010, possibly from other states in northern Brazil. We also found unique amino acids substitutions in the DENV-1 envelope and NS5 protein sequences in the Amapa isolates. Characterization of the DENV-1 BR-4 sequences highlights the potential of this new lineage to drive outbreaks of dengue in the Amazon region.