NEJM:恶性疟原虫K13-螺旋桨多态性的世界地图

2016-06-27 MedSci MedSci原创

近期在减少全球疟疾负担的过程中遇到了恶性疟原虫对青蒿素耐药性的难题。而决定这种耐药性的主要因素是部分恶性疟原虫基因编码kelch(K13)-螺旋桨域的突变,这一发现为监测全球这种耐药性提供了机会。 研究共纳入了59个疟疾流行的国家的14037个样本以分析K13-螺旋桨序列多态性。84.5%的样本取自用于接受抗疟药物耐药性全国监测点治疗的患者。通过邻近位点的单体型分析研究人员评估了突变的出现和传播。

近期在减少全球疟疾负担的过程中遇到了恶性疟原虫对青蒿素耐药性的难题。而决定这种耐药性的主要因素是部分恶性疟原虫基因编码kelch(K13)-螺旋桨域的突变,这一发现为监测全球这种耐药性提供了机会。

研究共纳入了59个疟疾流行的国家的14037个样本以分析K13-螺旋桨序列多态性。84.5%的样本取自用于接受抗疟药物耐药性全国监测点治疗的患者。通过邻近位点的单体型分析研究人员评估了突变的出现和传播。

结果研究人员共确定了108个非同义K13突变,其频率和分布存在地理差异。在亚洲,36.5%的K13的基因突变分布在两个领域,其中一个位于柬埔寨、越南、老挝、泰国西部、缅甸和中国,而并没有重叠。在非洲,研究人员发现一系列罕见的非同义突变,与寄生虫延迟清除无关。环状体时期生存率分析中发现,表达最为常见的非洲等位基因的存在A578S突变的基因编辑Dd2转基因株系对青蒿素敏感。

总而言之,研究发现东南亚和中国之外并没有证据表明疟疾对青蒿素的耐药性。常见的非洲A578S等位基因与临床或体外青蒿素耐药性无关,且许多非洲突变似乎是中立的。

原始出处:

Didier Ménard, Nimol Khim,et al., A Worldwide Map of Plasmodium falciparum K13-Propeller Polymorphisms. N Engl J Med 2016; 374:2453-2464June 23, 2016DOI: 10.1056/NEJMoa1513137.


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    2016-06-29 xzw120
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    2016-06-28 吴教授

    周边还未见疟疾患者

    0

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