23 research outputs found

    Artesunate-Amodiaquine and Artemether-Lumefantrine Therapies and Selection of <i>Pfcrt</i> and <i>Pfmdr1</i> Alleles in Nanoro, Burkina Faso

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    <div><p>The adoption of Artemisinin based combination therapies (ACT) constitutes a basic strategy for malaria control in sub-Saharan Africa. Moreover, since cases of ACT resistance have been reported in South-East Asia, the need to understand <i>P</i>. <i>falciparum</i> resistance mechanism to ACT has become a global research goal. The selective pressure of ACT and the possibility that some specific <i>Pfcrt</i> and <i>Pfmdr1</i> alleles are associated with treatment failures was assessed in a clinical trial comparing ASAQ to AL in Nanoro. Dried blood spots collected on Day 0 and on the day of recurrent parasitaemia during the 28-day follow-up were analyzed using the restriction fragments length polymorphism (PCR-RFLP) method to detect single nucleotide polymorphisms (<i>SNPs</i>) in <i>Pfcrt</i> (codon76) and <i>Pfmdr1</i> (codons 86, 184, 1034, 1042, and 1246) genes. Multivariate analysis of the relationship between the presence of <i>Pfcrt</i> and <i>Pfmdr1</i> alleles and treatment outcome was performed. AL and ASAQ exerted opposite trends in selecting <i>Pfcrt K76T</i> and <i>Pfmdr1-N86Y</i> alleles, raising the potential beneficial effect of using diverse ACT at the same time as first line treatments to reduce the selective pressure by each treatment regimen. No clear association between the presence of <i>Pfcrt</i> and <i>Pfmdr1</i> alleles carried at baseline and treatment failure was observed.</p></div

    Trial profile.

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    <p>The figure shows the number of isolates analyzed at day 0 and on the Day of recurrent parasitaemia (recrudescence and new infections) by treatment group (AL and ASAQ) and the number of successful PCR-RFLP amplification.</p
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