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Home / Archives for Cano J

Cano J

Pyruvate kinase deficiency in sub-Saharan Africa: identification of a highly frequent missense mutation (G829A;Glu277Lys) and association with malaria.

  • Autores: Amorim A, Arez AP, Cano J, Chibute S, Do Rosário VE, Fernandes N, Gomes C, Langa J, Machado P, Manco L, Mendes C, Miranda J, Pinto J, Ribeiro L, Salomé G, Sitoe L
  • Ano de Publicação: 2012
  • Journal: PLoS One
  • Link: http://www.ncbi.nlm.nih.gov/pubmed/?term=Pyruvate+Kinase+Deficiency+in+Sub-Saharan+Africa%3A+Identification+of+a+Highly+Frequent+Missense+Mutation+(G829A%3B+Glu277Lys)+and+Association+with+Malaria

BACKGROUND:
Pyruvate kinase (PK) deficiency, causing hemolytic anemia, has been associated to malaria protection and its prevalence in sub-Saharan Africa is not known so far. This work shows the results of a study undertaken to determine PK deficiency occurrence in some sub-Saharan African countries, as well as finding a prevalent PK variant underlying this deficiency.
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Genetic diversity and signatures of selection of drug resistance in Plasmodium populations from both human and mosquito hosts in continental Equatorial Guinea

  • Autores: Arez AP, Benito A, Berzosa P, Cano J, de Sousa B, Do Rosário VE, Gonzalez V, Mendes C, Salgueiro P
  • Ano de Publicação: 2013
  • Journal: Malaria Journal
  • Link: http://www.malariajournal.com/content/12/1/114

In Plasmodium, the high level of genetic diversity and the interactions established by co-infecting parasite populations within the same host may be a source of selection on pathogen virulence and drug resistance. As different patterns have already been described in humans and mosquitoes, parasite diversity and population structure should be studied in both hosts to properly assess their effects on infection and transmission dynamics. This study aimed to characterize the circulating populations of Plasmodium spp and Plasmodium falciparum from a combined set of human blood and mosquito samples gathered in mainland Equatorial Guinea. Further, the origin and evolution of anti-malarial resistance in this area, where malaria remains a major public health problem were traced.
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Duffy negative antigen is no longer a barrier to Plasmodium vivax–molecular evidences from the African West Coast (Angola and Equatorial Guinea).

  • Autores: Arez AP, Benito A, Berzosa P, Cano J, de Sousa B, Dias F, Do Rosário VE, Figueiredo J, Mendes C, Mora VG
  • Ano de Publicação: 2011
  • Journal: Plos Neglected Tropical Diseases
  • Link: http://www.ncbi.nlm.nih.gov/pubmed/?term=Duffy+negative+antigen+is+no+longer+a+barrier+to+Plasmodium+vivax+%E2%80%93+molecular+evidences+from+the+African+west+coast+(Angola+and+Equatorial+Guinea).

BACKGROUND:
Plasmodium vivax shows a small prevalence in West and Central Africa due to the high prevalence of Duffy negative people. However, Duffy negative individuals infected with P. vivax have been reported in areas of high prevalence of Duffy positive people who may serve as supply of P. vivax strains able to invade Duffy negative erythrocytes. We investigated the presence of P. vivax in two West African countries, using blood samples and mosquitoes collected during two on-going studies.
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Glossina palpalis palpalis populations from Equatorial Guinea belong to distinct allopatric clades

  • Autores: Bart J-M, Benito A, Cano J, Cordon-Obras C, Knapp J, Navarro M, Ndong-Mabale N, Ndongo-Asumu P, Nebreda P, Pinto J, Ricardo Ncogo-Ada P
  • Ano de Publicação: 2014
  • Journal: Parasites & Vectors
  • Link: http://www.parasitesandvectors.com/content/7/1/31

Luba is one of the four historical foci of Human African Trypanosomiasis (HAT) on Bioko Island, in Equatorial Guinea. Although no human cases have been detected since 1995, T. b. gambiense was recently observed in the vector Glossina palpalis palpalis. The existence of cryptic species within this vector taxon has been previously suggested, although no data are available regarding the evolutionary history of tsetse flies populations in Bioko.
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