[Presence of the double pfmdr1 mutation 86Tyr and 1246 Tyr in clones of a chloroquine-resistant west African isolate of Plasmodium falciparum].
Pinheiro, L;
Franco, S;
Adagu, IS;
Rosa, R;
Rosário, VE;
Warhurst, DC;
(2003)
[Presence of the double pfmdr1 mutation 86Tyr and 1246 Tyr in clones of a chloroquine-resistant west African isolate of Plasmodium falciparum].
Acta medica portuguesa, 16 (4).
pp. 229-233.
ISSN 0870-399X
https://researchonline.lshtm.ac.uk/id/eprint/354889
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Isolates of Plasmodium falciparum from three areas of West Africa were recovered from cryopreservation and their chloroquine-sensitivity were determined in vitro. Of the 90 samples studied, 60 were from Guinea-Bissau (30Resistant/30Sensitive), 15 were from S. Tomé and Príncipe (11Resistant/4Sensitive) and 15 were from Angola (11Resistant/4Sensitive). All the isolates were sensitive to mefloquine. Using the polymerase chain reaction/restriction fragment length polymorphism technique (PCR/RFLP) it was possible to detect two mutations in the pfmdr1 gene, often associated with chloroquine-resistance. 66% of the samples from Guiné-Bissau showed a correlation with chloroquine-resistance while 73% of the samples from São Tomé and Angola altogether had the 86Tyr mutation. The present study on West African isolates and clones showed, for the first time, the presence of a double point mutation in the pfmdr1 gene one being found, up to now, only in South America isolates of Plasmodium falciparum.
