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- W4230506890 abstract "Abstract Background : Copy number variations (CNVs) of the Plasmodium falciparum multidrug resistance 1 ( pfmdr1 ), P. falciparum pfplasmepsin2 ( pfplasmepsin2 ) and P. falciparum GTP cyclohydrolase 1 ( pfgch1 ) genes are associated with antimalarial drug resistance in P. falciparum malaria. Droplet digital PCR (ddPCR) assays have been developed for accurate assessment of CNVs in several human genes. The aim of the present study was to develop and validate ddPCR assays for detection of the CNVs of P. falciparum genes associated with resistance to antimalarial drugs. Methods : The ddPCR assays were developed to detect the CNVs in the pfmdr1 , pfplasmepsin2 and pfgch1 genes. The gene copy number (GCN) quantification limit, as well as the accuracy and precision of the ddPCR assays were determined and compared to conventional quantitative PCR (qPCR). In addition, the CNVs of genes of field samples collected from Thailand from 2015 to 2019 (n = 84) were assessed by ddPCR and results were compared to qPCR as the reference assay. Results : Based on the obtained gene copy number quantification limit, the accuracy and percent relative standard deviation (%RSD) value of the multiplex ddPCR assay were 95% and 5%, respectively, for detection of the CNV of the pfmdr1 gene, and 91% and 5% for detection of the CNV of the pfplasmepsin2 gene. The accuracy and %RSD value of the duplex ddPCR assay were 94.88% and 3.71, respectively, regarding pfgch1 GCN. In the P. falciparum field samples, pfmdr1 and pfplasmepsin2 GCNs were amplified in 15% and 27% of samples from Ubon Ratchathani, Thailand, while pfgch1 GCN was amplified in 50% of samples from Yala, Thailand. There was 100% agreement between the GCN results obtained from the ddPCR and qPCR assays (κ = 1.00). Conclusions : The developed ddPCR assays are simple, accurate, precise and cost-effective tools for detection of the CNVs in the pfmdr1 , pfplasmepsin2 and pfgch1 genes of P. falciparum . The ddPCR assay is a useful additional tool for the surveillance of antimalarial drug resistance." @default.
- W4230506890 created "2022-05-11" @default.
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- W4230506890 date "2020-11-11" @default.
- W4230506890 modified "2023-09-27" @default.
- W4230506890 title "Measurement of gene amplifications related to drug resistance in Plasmodium falciparum using droplet digital PCR" @default.
- W4230506890 doi "https://doi.org/10.21203/rs.3.rs-103611/v1" @default.
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