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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Cloning and characterization of mefloquine-resistant Plasmodium falciparum from Thailand.

Resistance to mefloquine in Plasmodium falciparum has begun to occur along the border of Thailand and Kampuchea. As a means of assessing the natural occurrence of mefloquine resistance, the admission and post-treatment parasite isolates from a mefloquine treatment failure were cloned and characterized. Clones from the admission isolate were susceptible to mefloquine in vitro (ID50 of 3.4 [2-5], G [95% CI] ng/ml) and showed a mixture of isozyme types for glucose phosphate isomerase ( GPI types I and II). The post-treatment clones were resistant to mefloquine in vitro (ID50 of 17.3 [13-23] ng/ml) with only one isozyme ( GPI type I) detected. These observations suggest that under mefloquine pressure a resistant parasite population was selected in the patient, indicating that the potential for mefloquine resistance already exists in the indigenous P. falciparum gene pool. In addition, the mefloquine-resistant clones showed decreased susceptibility in vitro to halofantrine suggesting possible cross-resistance to this new antimalarial drug currently under development.[1]


  1. Cloning and characterization of mefloquine-resistant Plasmodium falciparum from Thailand. Webster, H.K., Thaithong, S., Pavanand, K., Yongvanitchit, K., Pinswasdi, C., Boudreau, E.F. Am. J. Trop. Med. Hyg. (1985) [Pubmed]
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