Snail immunity to schistosomes: insights from omics studies

Area of Science:

• * Schistosomiasis research
• * Vector-parasite immunology
• * Genomics and host-pathogen interactions

Background:

• * Schistosomiasis is a major global health issue transmitted by freshwater snails.
• * Intermediate host snail species (Biomphalaria, Bulinus, Oncomelania) exhibit diverse infection outcomes.
• * Understanding snail host resistance mechanisms is crucial for disease control.

Purpose of the Study:

• * To explore the molecular basis of snail host resistance and susceptibility to Schistosoma parasites.
• * To investigate the role of host genotype and early immune responses in infection outcomes.
• * To identify potential molecular markers for surveillance and intervention.

Main Methods:

• * Application of multi-omics approaches, including genomics, transcriptomics, proteomics, and epigenomics.
• * Correlation of host genetic factors and immunological status with infection progression.
• * Analysis of early host-parasite interactions within the first 12-48 hours post-penetration.

Main Results:

• * Host resistance is often primed before parasite exposure, with key divergences occurring early post-penetration.
• * Successful resistance involves rapid hemocyte recruitment and effector deployment, while susceptibility is linked to parasite modulation.
• * Established infections induce complex host adaptations, including immune regulation and metabolic changes.
• * Snail genera possess distinct immunogenomic profiles with lineage-specific gene expansions.

Conclusions:

• * Early host-parasite interactions and parasite-derived modulators are critical determinants of schistosomiasis infection.
• * Molecular compatibility markers and functional genetic tools can enhance disease surveillance and intervention.
• * Integrated multi-omics studies in snail vectors are vital for advancing schistosomiasis control efforts.