Drug-Resistant Polymorphisms and Copy Numbers in Plasmodium falciparum, Mozambique, 2015.

Drug-Resistant Polymorphisms and Copy Numbers in Plasmodium falciparum, Mozambique, 2015.
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DOI:
10.3201/eid2401.170864
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发表时间:
2018-01
影响因子:
11.8
通讯作者:
Mayor A
Mayor A
中科院分区:
医学2区
文献类型:
--
作者:
Gupta H;Macete E;Bulo H;Salvador C;Warsame M;Carvalho E;Ménard D;Ringwald P;Bassat Q;Enosse S;Mayor A

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控制疟疾的基本步骤之一是使用抗疟药物。抗疟治疗的成功可能会受到恶性疟原虫耐药群体的影响。为了评估耐药性,我们使用分子方法检查了从莫桑比克 4 个哨点站点收集的 351 株恶性疟原虫分离株的 K13、pfmdr1、pfcrt 和 pfdhps 多态性以及plasmepsin2 (pfpm2) 和 pfmdr1 拷贝数。我们在 1.1% 的分离株中发现了 pfpm2 的多个拷贝。除 4 个新多态性(Leu619Leu、Phe656Ile、Val666Val、Gly690Gly)外,所有分离株均携带 K13 野生型等位基因(3D7 样)。带有 pfcrt 突变体 (K76T) 等位基因的分离株的流行率较低 (2.3%)。带有 pfdhps 突变等位基因(A437G 和 K540E)的分离株的流行率 >80%,表明磺胺多辛/乙胺嘧啶耐药性持续存在;然而,青蒿素标记物不存在,哌喹耐药性标记物也很低。随着双氢青蒿素/哌喹药物压力的增加,哌喹耐药菌株可能在莫桑比克传播。
One of the fundamental steps toward malaria control is the use of antimalarial drugs. The success of antimalarial treatment can be affected by the presence of drug-resistant populations of Plasmodium falciparum. To assess resistance, we used molecular methods to examine 351 P. falciparum isolates collected from 4 sentinel sites in Mozambique for K13, pfmdr1, pfcrt, and pfdhps polymorphisms and for plasmepsin2 (pfpm2) and pfmdr1 copy numbers. We found multiple copies of pfpm2 in 1.1% of isolates. All isolates carried K13 wild-type alleles (3D7-like), except 4 novel polymorphisms (Leu619Leu, Phe656Ile, Val666Val, Gly690Gly). Prevalence of isolates with pfcrt mutant (K76T) allele was low (2.3%). Prevalence of isolates with pfdhps mutant alleles (A437G and K540E) was >80%, indicating persistence of sulfadoxine/pyrimethamine resistance; however, markers of artemisinin were absent, and markers of piperaquine resistance were low. Piperaquine resistance isolates may spread in Mozambique as dihydroartemisinin/piperaquine drug pressure increases.
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