Faculty of Infectious and Tropical Diseases, London School of Hygiene and Tropical Medicine, London, UK.
Ministry of Public Health, Bissau, Guinea-Bissau.
Sci Rep. 2023 Apr 18;13(1):6311. doi: 10.1038/s41598-023-33176-1.
Following integrated malaria control interventions, malaria burden on the Bijagós Archipelago has significantly decreased. Understanding the genomic diversity of circulating Plasmodium falciparum malaria parasites can assist infection control, through identifying drug resistance mutations and characterising the complexity of population structure. This study presents the first whole genome sequence data for P. falciparum isolates from the Bijagós Archipelago. Amplified DNA from P. falciparum isolates sourced from dried blood spot samples of 15 asymptomatic malaria cases were sequenced. Using 1.3 million SNPs characterised across 795 African P. falciparum isolates, population structure analyses revealed that isolates from the archipelago cluster with samples from mainland West Africa and appear closely related to mainland populations; without forming a separate phylogenetic cluster. This study characterises SNPs associated with antimalarial drug resistance on the archipelago. We observed fixation of the PfDHFR mutations N51I and S108N, associated with resistance to sulphadoxine-pyrimethamine, and the continued presence of PfCRT K76T, associated with chloroquine resistance. These data have relevance for infection control and drug resistance surveillance; particularly considering expected increases in antimalarial drug use following updated WHO recommendations, and the recent implementation of seasonal malaria chemoprevention and mass drug administration in the region.
随着综合疟疾控制干预措施的实施,比热戈斯群岛的疟疾负担显著下降。了解循环疟原虫疟疾寄生虫的基因组多样性可以通过识别药物抗性突变和描述种群结构的复杂性来协助感染控制。本研究首次提供了来自比热戈斯群岛的疟原虫分离株的全基因组序列数据。从 15 例无症状疟疾病例的干血斑样本中扩增的疟原虫分离株 DNA 进行了测序。利用在 795 株非洲疟原虫分离株中鉴定的 130 万个 SNP,种群结构分析显示,来自群岛的分离株与来自西非大陆的样本聚类,并且与大陆种群密切相关;没有形成单独的系统发育聚类。本研究对群岛上与抗疟药物耐药性相关的 SNPs 进行了特征描述。我们观察到与磺胺多辛-乙胺嘧啶耐药性相关的 PfDHFR 突变 N51I 和 S108N 的固定,以及与氯喹耐药性相关的 PfCRT K76T 的持续存在。这些数据对于感染控制和药物耐药性监测具有重要意义;特别是考虑到在世界卫生组织更新建议后预计会增加抗疟药物的使用,以及该地区最近实施季节性疟疾化学预防和大规模药物治疗。
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