The Compatibility Between Biomphalaria glabrata Snails and Schistosoma mansoni: An Increasingly Complex Puzzle

Area of Science:

• Malacology
• Parasitology
• Immunology

Background:

• Schistosomiasis is a major human disease caused by the parasitic flatworm Schistosoma mansoni.
• The snail Biomphalaria glabrata is the primary intermediate host for Schistosoma mansoni.
• Host-parasite compatibility between B. glabrata and S. mansoni is a complex trait with significant implications for disease transmission.

Purpose of the Study:

• To reexamine decades of research on the compatibility polymorphism between Biomphalaria glabrata and Schistosoma mansoni.
• To propose an integrated model for host-parasite compatibility, moving beyond single-hypothesis explanations.
• To highlight the need for integrative approaches to control schistosomiasis transmission.

Main Methods:

• Review of existing literature on snail-parasite compatibility.
• Analysis of genetic and molecular data related to snail immune responses and parasite antigens.
• Consideration of environmental factors influencing host-parasite interactions.

Main Results:

• Evidence suggests both snail resistance and a "matching hypothesis" (immune receptor-antigen interaction) contribute to compatibility.
• The compatible/incompatible status likely results from a balance of multiple molecular determinants.
• Co-evolutionary dynamics and environmental factors can modulate these mechanisms, increasing complexity.

Conclusions:

• Host-parasite compatibility in the B. glabrata/S. mansoni system is multifactorial and dynamic.
• Integrative approaches are crucial for understanding and potentially manipulating this complex interaction.
• Identifying novel control targets for schistosomiasis transmission requires a holistic view of compatibility mechanisms.