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Home / Archives for Abecasis A

Abecasis A

Characterization of an insect-specific flavivirus (OCFVPT) co-isolated from Ochlerotatus caspius collected in southern Portugal along with a putative new Negev-like virus

  • Autores: Abecasis A, de Almeida APG, de Matos AP, Esteves A, Lopes A, Parreira R, Piedade J
  • Ano de Publicação: 2013
  • Journal: Virus Genes
  • Link: http://www.ncbi.nlm.nih.gov/pubmed/23877720

We describe the isolation and characterization of an insect-specific flavivirus (ISF) from Ochlerotatus caspius (Pallas, 1771) mosquitoes collected in southern Portugal. The RNA genome of this virus, tentatively designated OCFVPT, for O. caspius flavivirus from Portugal, encodes a polyprotein showing all the features expected for a flavivirus. As frequently observed for ISF, the viral genomes seems to encode a putative Fairly Interesting Flavivirus ORF (FIFO)-like product, the synthesis of which would occur as a result of a -1 translation frameshift event. OCFVPT was isolated in the C6/36 Stegomyia albopicta (= Aedes albopictus) cell line where it replicates rapidly, but failed to replicate in Vero cells in common with other ISFs.
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Phylodynamics of the HIV-1 CRF02_AG clade in Cameroon.

  • Autores: Abecasis A, Bonfim I, Camacho RJ, Faria NR, Lemey P, Ndembi N, Sousa JD, Suchard MA, Vandamme AM
  • Ano de Publicação: 2012
  • Journal: Infection Genetics and Evolution
  • Link: http://www.ncbi.nlm.nih.gov/pubmed/?term=Phylodynamics+of+the+HIV-1+CRF02_AG+clade+in+Cameroon

Evolutionary analyses have revealed an origin of pandemic HIV-1 group M in the Congo River basin in the first part of the XX century, but the patterns of historical viral spread in or around its epicentre remain largely unexplored. Here, we combine epidemiologic and molecular sequence data to investigate the spatiotemporal patterns of the CRF02_AG clade.
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Discordant predictions of residual activity could impact dolutegravir prescription upon raltegravir failure

  • Autores: Abecasis A, Cabanas J, Camacho RJ, Gomes P, Libin P, Theys K, Van Laethem K
  • Ano de Publicação: 2015
  • Journal: Journal of Clinical Virology
  • Link: http://www.ncbi.nlm.nih.gov/pubmed/26305833

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Negeviruses found in multiple species of mosquitoes from southern Portugal: Isolation, genetic diversity, and replication in insect cell culture

  • Autores: Abecasis A, Carapeta S, de Almeida APG, de Matos AP, do Bem B, Esteves A, Lopes A, McGuinness J, Parreira R, Piedade J
  • Ano de Publicação: 2015
  • Journal: Virology
  • Link: http://www.ncbi.nlm.nih.gov/pubmed/26057025

In this report, an RT-PCR approach based on the use of degenerate primers allowed the identification of negeviruses in four different species of mosquitoes (Ochlerotatus caspius, Culex pipiens, Cx. theileri and Cx. univittatus) collected in southern Portugal. The genomes of two of these viruses, sequenced to full completion, were shown to encode all the proteins encoded by previously described negeviruses
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Patterns of Transmitted HIV drug resistance in Europe vary by risk group

  • Autores: Abecasis A, Albert J, Åsjö B, Balotta C, Bergin C, Beshkov D, Boucher C, Camacho R, Clotet B, Frentz D, Griskevicius A, Grossman Z, Hamouda O, Horban A, Jørgensen L, Kolupajeva T, Korn K, Kostrikis L, Kücherer C, Linka KL, Nielsen C, Otelea D, Paraskevis D, Paredes R, Poljak M, Programme AW, Puchhammer-Stöckl E, Schmit JC, Sönnerborg A, Staneková D, Stanojevic M, Struck D, van de Vijver D, Vandamme AM, Vercauteren J
  • Ano de Publicação: 2014
  • Journal: PLoS One
  • Link: http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0094495

In Europe, a continuous programme (SPREAD) has been in place for ten years to study transmission of drug resistant HIV. We analysed time trends of transmitted drug resistance mutations (TDRM) in relation to the risk behaviour reported.
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HIV-2 Integrase Polymorphisms and Longitudinal Genotypic Analysis of HIV-2 Infected Patients Failing a Raltegravir-Containing Regimen

  • Autores: Abecasis A, Aguas MJ, Almeida I, Camacho RJ, Cavaco-Silva J, Cunha C, Diniz A, Germano I, Gomes P, Gonçalves Mde F, Maltez F, Miranda AC, Narciso J, Poças J
  • Ano de Publicação: 2014
  • Journal: PLoS One
  • Link: http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0092747

To characterize the HIV-2 integrase gene polymorphisms and the pathways to resistance of HIV-2 patients failing a raltegravir-containing regimen, we studied 63 integrase strand transfer inhibitors (INSTI)-naïve patients, and 10 heavily pretreated patients exhibiting virological failure while receiving a salvage raltegravir-containing regimen.
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