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

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.