Development of a novel real-time polymerase chain reaction assay for the sensitive detection of Schistosoma japonicum in human stool

Elimination and control of Schistosoma japonicum, the most virulent of the schistosomiasis-causing blood flukes, requires the development of sensitive and specific diagnostic tools capable of providing an accurate measurement of the infection prevalence in endemic areas. Typically, detection of S. j...

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Veröffentlicht in:PLoS neglected tropical diseases 2021-10, Vol.15 (10), p.e0009877-e0009877
Hauptverfasser: Halili, Sara, Grant, Jessica R, Pilotte, Nils, Gordon, Catherine A, Williams, Steven A
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container_title PLoS neglected tropical diseases
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creator Halili, Sara
Grant, Jessica R
Pilotte, Nils
Gordon, Catherine A
Williams, Steven A
description Elimination and control of Schistosoma japonicum, the most virulent of the schistosomiasis-causing blood flukes, requires the development of sensitive and specific diagnostic tools capable of providing an accurate measurement of the infection prevalence in endemic areas. Typically, detection of S. japonicum has occurred using the Kato-Katz technique, but this methodology, which requires skilled microscopists, has been shown to radically underestimate levels of infection. With the ever-improving capabilities of next-generation sequencing and bioinformatic analysis tools, identification of satellite sequences and other highly repetitive genomic elements for use as real-time PCR diagnostic targets is becoming increasingly common. Assays developed using these targets have the ability to improve the sensitivity and specificity of results for epidemiological studies that can in turn be used to inform mass drug administration and programmatic decision making. Utilizing Tandem Repeat Analyzer (TAREAN) and RepeatExplorer2, a cluster-based analysis of the S. japonicum genome was performed and a tandemly arranged genomic repeat, which we named SjTR1 (Schistosoma japonicum Tandem Repeat 1), was selected as the target for a real-time PCR diagnostic assay. Based on these analyses, a primer/probe set was designed and the assay was optimized. The resulting real-time PCR test was shown to reliably detect as little as 200 ag of S. japonicum genomic DNA and as little as 1 egg per gram of human stool. Based on these results, the index assay reported in this manuscript is more sensitive than previously published real-time PCR assays for the detection of S. japonicum. The extremely sensitive and specific diagnostic assay described in this manuscript will facilitate the accurate detection of S. japonicum, particularly in regions with low levels of endemicity. This assay will be useful in providing data to inform programmatic decision makers, aiding disease control and elimination efforts.
doi_str_mv 10.1371/journal.pntd.0009877
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source PLoS; MEDLINE; PubMed Central; Directory of Open Access Journals; EZB Electronic Journals Library; PubMed Central Open Access
subjects Animals
Annealing
Assaying
Binding sites
Biochemical assays
Biology and Life Sciences
Decision analysis
Decision making
Deoxyribonucleic acid
Detection
Diagnosis
Disease control
DNA
DNA Primers - genetics
Efficiency
Eggs
Endemism
Epidemiology
Ethics
Feces - parasitology
Female
Genomes
Genomics
Human wastes
Humans
Infections
Male
Methods
Microscopy
Mitochondrial DNA
Molecular diagnostic techniques
Next-generation sequencing
Nucleotide sequence
PCR
Polymerase chain reaction
Real time
Real-Time Polymerase Chain Reaction - methods
Research and Analysis Methods
Schistosoma japonicum
Schistosoma japonicum - genetics
Schistosoma japonicum - isolation & purification
Schistosomiasis
Schistosomiasis japonica - diagnosis
Schistosomiasis japonica - parasitology
Sensitivity and Specificity
Specificity
Tropical diseases
title Development of a novel real-time polymerase chain reaction assay for the sensitive detection of Schistosoma japonicum in human stool
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