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Detection of the Malaria causing Plasmodium Parasite in Saliva from Infected Patients using Topoisomerase I Activity as a Biomarker.

Abstract：

:Malaria is among the major threats to global health with the main burden of disease being in rural areas of developing countries where accurate diagnosis based on non-invasive samples is in high demand. We here present a novel molecular assay for detection of malaria parasites based on technology that may be adapted for low-resource settings. Moreover, we demonstrate the exploitation of this assay for detection of malaria in saliva. The setup relies on pump-free microfluidics enabled extraction combined with a DNA sensor substrate that is converted to a single-stranded DNA circle specifically by topoisomerase I expressed by the malaria causing Plasmodium parasite. Subsequent rolling circle amplification of the generated DNA circle in the presence of biotin conjugated deoxynucleotides resulted in long tandem repeat products that was visualized colorimetrically upon binding of horse radish peroxidase (HRP) and addition of 3,3',5,5'-Tetramethylbenzidine that was converted to a blue colored product by HRP. The assay was directly quantitative, specific for Plasmodium parasites, and allowed detection of Plasmodium infection in a single drop of saliva from 35 out of 35 infected individuals tested. The results could be determined directly by the naked eye and documented by quantifying the color intensity using a standard paper scanner.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Hede MS,Fjelstrup S,Lötsch F,Zoleko RM,Klicpera A,Groger M,Mischlinger J,Endame L,Veletzky L,Neher R,Simonsen AKW,Petersen E,Mombo-Ngoma G,Stougaard M,Ho YP,Labouriau R,Ramharter M,Knudsen BR

doi

10.1038/s41598-018-22378-7

subject

Has Abstract

pub_date

2018-03-07 00:00:00

pages

4122

issue

1

issn

2045-2322

pii

10.1038/s41598-018-22378-7

journal_volume

8

pub_type

杂志文章

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