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Home / Archives for Abecasis AB

Abecasis AB

Limited cross-border infections in patients newly diagnosed with HIV in Europe

  • Autores: Abecasis AB, Albert J, Åsjö B, Balotta C, Beshkov D, Camacho RJ, Clotet B, Coughlan S, De Wit S, Frentz D, Griskevicius A, Grossman Z, Hamouda O, Horban A, Jørgensen LB, Kolupajeva T, Korn K, Kostrikis LG, Kücherer C, Liitsola K, Linka M, Nielsen C, Otelea D, Paraskevis D, Paredes R, Poljak M, Schmit JC, Sönnerborg A, Staneková D, Stanojevic M, Struck D, Vandamme AM, Wensing AMJ
  • Ano de Publicação: 2013
  • Journal: Retrovirology
  • Link: http://www.retrovirology.com/content/10/1/36

International travel plays a role in the spread of HIV-1 across Europe. It is, however, not known whether international travel is more important for spread of the epidemic as compared to endogenous infections within single countries. In this study, phylogenetic associations among HIV of newly diagnosed patients were determined across Europe.
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Short communication: Prevalence of HIV type 1 transmitted drug resistance in Slovenia: 2005-2010

  • Autores: Abecasis AB, Karner P, Lunar MM, Maver PJ, Pecavar B, Poljak M, Seme K, Tomazic J, Vidmar L, Vovko TD, Židovec Lepej S
  • Ano de Publicação: 2013
  • Journal: AIDS Research and Human Retroviruses
  • Link: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3552160/

Slovenia is a small European country with a total of 547 HIV-infected individuals cumulatively reported by the end of 2011. However, the estimated incidence rate of HIV infections increased from 7.0 per million in 2003 to 26.8 per million in 2011. In this study, we assessed the prevalence of transmitted drug resistance (TDR) in the past 6 years (2005–2010) and analyzed the time trend of the proportion of men having sex with men (MSM) and HIV-1 subtype B among newly diagnosed individuals in a 15-year period (1996–2010) in Slovenia.
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InTB – a data integration platform for molecular and clinical epidemiological analysis of tuberculosis

  • Autores: Abecasis AB, Alves RJ, Gomes MGM, Penha-Gonçalves C, Pereira-Leal JB, Soares P
  • Ano de Publicação: 2013
  • Journal: BMC Bioinformatics
  • Link: http://www.biomedcentral.com/1471-2105/14/264

Tuberculosis is currently the second highest cause of death from infectious diseases worldwide. The emergence of multi and extensive drug resistance is threatening to make tuberculosis incurable. There is growing evidence that the genetic diversity of Mycobacterium tuberculosis may have important clinical consequences
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Automated subtyping of HIV-1 genetic sequences for clinical and surveillance purposes: Performance evaluation of the new REGA version 3 and seven other tools

  • Autores: Abecasis AB, Camacho RJ, De Oliveira T, Deforche K, Faria NR, Gomez-Lopez A, Imbrechts S, Libin P, Pineda-Peña AC, Vandamme AM
  • Ano de Publicação: 2013
  • Journal: Infection Genetics and Evolution
  • Link: http://www.ncbi.nlm.nih.gov/pubmed/23660484

To investigate differences in pathogenesis, diagnosis and resistance pathways between HIV-1 subtypes, an accurate subtyping tool for large datasets is needed. We aimed to evaluate the performance of automated subtyping tools to classify the different subtypes and circulating recombinant forms using pol, the most sequenced region in clinical practice. We also present the upgraded version 3 of the Rega HIV subtyping tool (REGAv3).
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Comparative performance of the REGA subtyping tool version 2 versus version 1

  • Autores: Abecasis AB, Camacho RJ, De Oliveira T, Imbrechts S, Libin P, Vandamme AM, Wang Y
  • Ano de Publicação: 2010
  • Journal: Infection Genetics and Evolution
  • Link: http://www.ncbi.nlm.nih.gov/pubmed/?term=Comparative+performance+of+the+REGA+subtyping+tool+version+2+versus+version+1

The REGA HIV-1 subtyping tool is a phylogenetic-based method for subtyping HIV-1 genomic sequences that was published in 2005. The subtyping tool combines phylogenetic approaches with recombination detection methods.
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Origin and Epidemiological History of HIV-1 CRF14_BG

  • Autores: Abecasis AB, Barroso H, Bártolo I, Borrego P, Camacho R, Gomes P, McCutchan F, Taveira N
  • Ano de Publicação: 2011
  • Journal: PLoS One
  • Link: https://apps.webofknowledge.com/full_record.do?product=UA&search_mode=GeneralSearch&qid=26&SID=P2WA5hwy5j35Sqjoq2z&page=1&doc=1

Background: CRF14_BG isolates, originally found in Spain, are characterized by CXCR4 tropism and rapid disease progression. This study aimed to identify the origin of CRF14_BG and reconstruct its epidemiological history based on new isolates from Portugal.
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Superinfection with drug-resistant HIV is rare and does not contribute substantially to therapy failure in a large European cohort

  • Autores: Abecasis AB, Assel M, Bartha I, Luca AD, Müller V, Paredes R, Rosi A, Schülter E, Sloot PMA, Sönner-borg A, Svärd J, Torti C, van de Vijver DC, Van Laethem K, Vandamme AM, Zazzi M
  • Ano de Publicação: 2013
  • Journal: Bmc Infectious Diseases
  • Link: http://www.biomedcentral.com/1471-2334/13/537/

Superinfection with drug resistant HIV strains could potentially contribute to compromised therapy in patients initially infected with drug-sensitive virus and receiving antiretroviral therapy. To investigate the importance of this potential route to drug resistance, we developed a bioinformatics pipeline to detect superinfection from routinely collected genotyping data, and assessed whether superinfection contributed to increased drug resistance in a large European cohort of viremic, drug treated patients.
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HIV-1 subtype is an independent predictor of reverse transcriptase mutation k65r in HIV-1 patients treated with combination antiretroviral therapy including tenofovir

  • Autores: Abecasis AB, Camacho RJ, Clotet B, De Luca A, Grossman Z, Schülter E, Snoeck J, Sönnerborg A, Struck D, Theys K, Torti C, Vandamme AM, Vercauteren J, Zazzi M
  • Ano de Publicação: 2013
  • Journal: Antimicrobial Agents and Chemotherapy
  • Link: http://www.ncbi.nlm.nih.gov/pubmed/23183438

Subtype-dependent selection of HIV-1 reverse transcriptase resistance mutation K65R was previously observed in cell culture and small clinical investigations. We compared K65R prevalence across subtypes A, B, C, F, G, and CRF02_AG separately in a cohort of 3,076 patients on combination therapy including tenofovir. K65R selection was significantly higher in HIV-1 subtype C. This could not be explained by clinical and demographic factors in multivariate analysis, suggesting subtype sequence-specific K65R pathways.
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Decreasing population selection rates of resistance mutation K65R over time in HIV-1 patients receiving com- bination therapy including tenofovir

  • Autores: Abecasis AB, Abreu R, Aguas MJ, Aldir I, Aleixo MJ, Amaro G, Antunes F, Borges F, Botas J, Branco T, Caixas U, Camacho RJ, Diniz A, Doroana M, Duque L, Faria D, Faria N, Faria T, Fonseca P, Germano I, Gomes F, Guerreiro C, Jesus MB, Mansinho K, Mineiro A, Miranda AC, Narciso J, Neves I, Nina J, Pinheiro S, Pinto IV, Proença P, Reis AP, Roxo F, Sá J, Santos C, Snoeck J, Tavares L, Teófilo E, Theys K, Valadas E, Vandamme AM, Ventura F, Vera J, Vercauteren J
  • Ano de Publicação: 2013
  • Journal: Journal of Antimicrobial Chemotherapy
  • Link: http://www.ncbi.nlm.nih.gov/pubmed/23027713

The use of tenofovir is highly associated with the emergence of mutation K65R, which confers broad resistance to nucleoside/nucleotide analogue reverse transcriptase inhibitors (NRTIs), especially when tenofovir is combined with other NRTIs also selecting for K65R. Although recent HIV-1 treatment guidelines discouraging these combinations resulted in reduced K65R selection with tenofovir, updated information on the impact of currently recommended regimens on the population selection rate of K65R is presently lacking.
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HIV-1 drug resistance: Where do polymorphisms fit in?

  • Autores: Abecasis AB, Theys K, Vandamme AM
  • Ano de Publicação: 2013
  • Journal: Future Microbiology
  • Link: http://www.ncbi.nlm.nih.gov/pubmed/23464368

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