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Ookluc: A Plasmodium berghei Line for Identifying Transmission-blocking Compounds.

Janaína T Novais1, Juliana Calit1, Letícia G Morosini1

  • 1Department of Parasitology, Institute of Biomedical Sciences, University of São Paulo.

Journal of Visualized Experiments : Jove
|July 28, 2025
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Summary
This summary is machine-generated.

Researchers developed a new high-throughput screening assay using Plasmodium berghei parasites to identify malaria transmission-blocking compounds. This novel method aids in discovering drugs targeting critical parasite stages for disease control.

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Area of Science:

  • Malariology
  • Parasitology
  • Drug Discovery

Background:

  • Malaria affects millions globally, necessitating effective control strategies.
  • Transmission-blocking (TB) interventions target parasite stages to prevent disease spread.
  • Current tools for screening TB compounds against later sexual stages are limited.

Purpose of the Study:

  • To develop a novel high-throughput screening (HTS) assay for malaria transmission-blocking compounds.
  • To facilitate the discovery of interventions targeting Plasmodium sexual stages.
  • To enable quantitative assessment of gamete to zygote and zygote to ookinete differentiation.

Main Methods:

  • Development of a transgenic Plasmodium berghei parasite (Ookluc) expressing nanoluciferase.
  • Utilized a luminescence-based HTS assay to monitor zygote formation and ookinete development.
  • Screened for compounds affecting gametocyte activation and fertilization in a murine malaria model.

Main Results:

  • The Ookluc parasite enables luminescence detection exclusively after zygote formation.
  • Assay provides a quantitative readout correlating luminescence with ookinete formation.
  • Demonstrated a novel method for screening malaria transmission-blocking compounds.

Conclusions:

  • The developed HTS assay accelerates the discovery of novel malaria transmission-blocking compounds.
  • This tool addresses limitations in studying later sexual stages of the parasite.
  • Facilitates research into effective strategies for malaria transmission interruption.