The Pathogenesis of African Trypanosomiasis

Area of Science:

• Parasitology
• Immunology
• Genetics

Background:

• African trypanosomes are protozoan parasites causing sleeping sickness in humans and mammals.
• Parasites evade host immune responses for long-term infection and transmission.
• Pathology includes anemia, brain dysfunction, and impaired antibody responses.

Purpose of the Study:

• To investigate the role of apolipoprotein L1 (APOL1) in human resistance to African trypanosomiasis.
• To understand how parasite resistance factors interact with human APOL1.
• To explore the implications of APOL1 variants in disease susceptibility and vaccination.

Main Methods:

• Analysis of host-parasite interactions.
• Study of immune evasion strategies employed by trypanosomes.
• Examination of APOL1 genetic variants and their functional consequences.

Main Results:

• Human serum contains APOL1, a trypanolytic factor.
• Human-infective trypanosomes possess resistance factors inhibiting APOL1.
• Certain human APOL1 variants confer resistance to sleeping sickness by counteracting parasite factors.

Conclusions:

• APOL1 plays a critical role in innate immunity against African trypanosomiasis.
• APOL1 variants offer protection against sleeping sickness but are associated with kidney disease, particularly in inflammatory conditions like COVID-19.
• Understanding these interactions is crucial for developing therapeutic and vaccination strategies.