Alelos mutantes asociados a la resistencia a cloroquina y sulfadoxina-pirimetamina en Plasmodium falciparum de las fronteras Ecuador-Perú y Ecuador-Colombia / Mutant alleles associated to chloroquine and sulfadoxine-pyrimethanime resistance in Plasmodium falciparum of the Ecuador-Peru and Ecuador-Colombia borders
Rev. peru. med. exp. salud publica
;
31(2): 282-287, abr.-jun. 2014. ilus
Artigo
em Espanhol
| LILACS, LIPECS
| ID: lil-719506
RESUMEN
Se evaluó la frecuencia de mutaciones en los genes pfCRT y DHFR/DHPS del Plasmodium falciparum asociados a la resistencia a cloroquina y sulfadoxina-pirimetamina en 83 cepas provenientes de los distritos Esmeralda y Machala ubicados en las fronteras entre Ecuador-Perú y Ecuador-Colombia durante el año 2002. Se empleó la reacción en cadena de polimerasa (PCR) convencional y sus variantes. El gen pfCRT presentó más de 90% de muestras mutantes en Esmeralda y Machala. Para el gen DHFR, el 90% de las cepas fueron muestras mutantes en Esmeralda, tres fueron mutaciones dobles y una triple; en Machala se encontró 25% de formas mutantes simples y 75% de formas mixtas (formas silvestres/mutantes). En conclusión, la resistencia a cloroquina se ha fijado en las cepas portadoras de la mutación K76T pfCRT, mientras que la impronta genética a la resistencia a pirimetamina está en evolución, principalmente en el distrito de Esmeralda.
ABSTRACT
The frequency of mutations in pfCRT and DHFR/DHPS genes of Plasmodium falciparum associated with resistance to chloroquine and sulfadoxine-pyrimethamine was evaluated in 83 strains from the districts of Esmeralda and Machala, located on the borders of Ecuador-Peru and Ecuador-Colombia in 2002. Polymerase chain reaction (PCR), conventional and its variants, was used. Mutations in the pfCRT gene were found in more than 90% of the samples from Esmeralda and Machala. For the DHFR gene, 90% of the strains were mutant samples from Esmeralda, 3 were double mutations and 1 was a triple mutation. In Machala, 25% were simple mutant forms and 75% mixed mutant forms (wild forms/mutant). In conclusion, resistance to chloroquine has been fixed in strains carrying K76T pfCRT mutation, whereas genetic imprinting for resistance to pyrimethamine is evolving, particularly in the district of Esmeralda.
Texto completo:
DisponíveL
Índice:
LILACS (Américas)
Assunto principal:
Plasmodium falciparum
/
Pirimetamina
/
Sulfadoxina
/
Cloroquina
/
Alelos
/
Mutação
/
Antimaláricos
Tipo de estudo:
Fatores de risco
Limite:
Humanos
País/Região como assunto:
América do Sul
/
Colômbia
/
Equador
/
Peru
Idioma:
Espanhol
Revista:
Rev. peru. med. exp. salud publica
Ano de publicação:
2014
Tipo de documento:
Artigo
Instituição/País de afiliação:
Instituto Nacional de Salud/PE
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