Evidence map›Paper›PMID 33407529›Full record

ArticleMalaria journal2021

KASP: a genotyping method to rapid identification of resistance in Plasmodium falciparum.

Ana Alvarez-Fernandez, María J Bernal, Isabel Fradejas, Alexandra Martin Ramírez, Noor Azian Md Yusuf, Marta Lanza, Shamilah Hisam, Ana Pérez de Ayala, José M Rubio

Open access · goldAbstract read
In one paragraph

Article in Malaria journal, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 13 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
13citing papers in PubMed, 1 pooled it
4.7field-weighted citation impact, top 5% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

13 citing papers in PubMed, 1 synthesis or guideline pooled it, 29 citations in OpenAlex.

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  7. Association analysis of polymorphisms inFrontiers in genetics · 2024
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4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

9 authors at 3 institutions in 2 countries.

Ana Alvarez-FernandezMalaria & Parasitic Emerging Diseases Laboratory, National Microbiology Center, Instituto de Salud Carlos III, Madrid, Spain.
María J BernalMalaria & Parasitic Emerging Diseases Laboratory, National Microbiology Center, Instituto de Salud Carlos III, Madrid, Spain.
Isabel FradejasDepartment of Clinical Microbiology, Hospital Universitario, 12 de Octubre, Madrid, Spain.
Alexandra Martin RamírezMalaria & Parasitic Emerging Diseases Laboratory, National Microbiology Center, Instituto de Salud Carlos III, Madrid, Spain.
Noor Azian Md YusufParasitology Unit, Infectious Disease Research Centre, Institute for Medical Research, National Institute of Health, Setia Alam, Selangor, Malaysia.
Marta LanzaMalaria & Parasitic Emerging Diseases Laboratory, National Microbiology Center, Instituto de Salud Carlos III, Madrid, Spain.
Shamilah HisamParasitology Unit, Infectious Disease Research Centre, Institute for Medical Research, National Institute of Health, Setia Alam, Selangor, Malaysia.
Ana Pérez de AyalaDepartment of Clinical Microbiology, Hospital Universitario, 12 de Octubre, Madrid, Spain.
José M RubioMalaria & Parasitic Emerging Diseases Laboratory, National Microbiology Center, Instituto de Salud Carlos III, Madrid, Spain. jmrubio@isciii.es.ORCID http://orcid.org/0000-0002-1903-6711
Instituto de Salud Carlos III · ESHospital Universitario 12 De Octubre · ESInstitute for Medical Research · MY

Funding

Instituto de Salud Carlos III CM17CIII/00012Instituto de Salud Carlos III PI17/01791Instituto de Salud Carlos III PI17CIII/00035
6 · The paper itself

Abstract

backgroundThe emergence and spread of anti-malarial resistance continues to hinder malaria control. Plasmodium falciparum, the species that causes most human malaria cases and most deaths, has shown resistance to almost all known anti-malarials. This anti-malarial resistance arises from the development and subsequent expansion of Single Nucleotide Polymorphisms (SNPs) in specific parasite genes. A quick and cheap tool for the detection of drug resistance can be crucial and very useful for use in hospitals and in malaria control programmes. It has been demonstrated in different contexts that genotyping by Kompetitive Allele Specific PCR (KASP), is a simple, fast and economical method that allows a high-precision biallelic characterization of SNPs, hence its possible utility in the study of resistance in P. falciparum.

methodsThree SNPs involved in most cases of resistance to the most widespread anti-malarial treatments have been analysed by PCR plus sequencing and by KASP (C580Y of the Kelch13 gene, Y86N of the Pfmdr1 gene and M133I of the Pfcytb gene). A total of 113 P. falciparum positive samples and 24 negative samples, previously analysed by PCR and sequencing, were selected for this assay. Likewise, the samples were genotyped for the MSP-1 and MSP-2 genes, and the Multiplicity of Infection (MOI) and parasitaemia were measured to observe their possible influence on the KASP method.

resultsThe KASP results showed the same expected mutations and wild type genotypes as the reference method, with few exceptions that correlated with very low parasitaemia samples. In addition, two cases of heterozygotes that had not been detected by sequencing were found. No correlation was found between the MOI or parasitaemia and the KASP values of the sample. The reproducibility of the technique shows no oscillations between repetitions in any of the three SNPs analysed.

conclusionsThe KASP assays developed in this study were efficient and versatile for the determination of the Plasmodium genotypes related to resistance. The method is simple, fast, reproducible with low cost in personnel, material and equipment and scalable, being able to core KASP arrays, including numerous SNPs, to complete the main pattern of mutations associated to P. falciparum resistance.

Indexed as

GenotypePolymorphism, Single NucleotideAntimalarialsDrug ResistanceGenotyping TechniquesPlasmodium falciparumReproducibility of ResultsAntimalarialsCytbK13KASPMDRPlasmodium falciparumResistanceSNPs

Identifiers

PMID33407529
PMCPMC7789257
OpenAlexW3117112677

What OpenQuestion holds

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LicenceCC BY
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Registered trials

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.