A real-time PCR assay for quantifying Plasmodium falciparum infections in the mosquito vector

Andrew Stuart Bell, L. C. Ranford-Cartwright

Research output: Contribution to journalArticle

37 Citations (Scopus)

Abstract

Transmission-blocking vaccines prevent the development of Plasmodium parasite within the mosquito vector, thereby thwarting the spread of malaria through a community. The gold standard for determining the efficacy of a transmission-blocking vaccine is the standard membrane feeding assay. This assay requires the dissection of mosquitoes and microscopic counting of oocysts present on the mosquito mid-gut, typically at 7-10 days p.i. Here we describe a real-time quantitative PCR assay that is rapid, target-specific and robust, with a sensitive detection threshold and which may be employed earlier p.i. than the standard membrane feeding assay and is applicable to preserved material. The real-time PCR assay utilises the LightCycler platform and SYBR Green I detection system to amplify 180 bp of the asexual form of the Plasmodium falciparum rRNA gene. It has a quantitative range of greater than four orders of magnitude and a detection threshold of 10 parasites. Validation experiments using a monoclonal antibody of known blocking activity revealed the real-time PCR assay to give equivalent results to the standard membrane feeding assay. In addition, the PCR assay can establish the effect of such a monoclonal antibody on the parasites' development within the oocyst and on the sporozoite (the transmissible stage) yield, providing a more pertinent assessment of transmission blocking activity than is possible by the standard membrane feeding assay. This assay may also be employed to monitor the sporogonic development of P. falciparum parasites within the mosquito vector.

Original languageEnglish (US)
Pages (from-to)795-802
Number of pages8
JournalInternational Journal for Parasitology
Volume34
Issue number7
DOIs
StatePublished - Jun 1 2004

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Plasmodium falciparum
Malaria
Real-Time Polymerase Chain Reaction
Parasites
Membranes
Oocysts
Culicidae
Vaccines
Monoclonal Antibodies
Sporozoites
Plasmodium
rRNA Genes
Dissection
Mosquito Vectors
Polymerase Chain Reaction

All Science Journal Classification (ASJC) codes

  • Parasitology
  • Infectious Diseases

Cite this

Bell, Andrew Stuart ; Ranford-Cartwright, L. C. / A real-time PCR assay for quantifying Plasmodium falciparum infections in the mosquito vector. In: International Journal for Parasitology. 2004 ; Vol. 34, No. 7. pp. 795-802.
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A real-time PCR assay for quantifying Plasmodium falciparum infections in the mosquito vector. / Bell, Andrew Stuart; Ranford-Cartwright, L. C.

In: International Journal for Parasitology, Vol. 34, No. 7, 01.06.2004, p. 795-802.

Research output: Contribution to journalArticle

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