Ecological Frameworks of Pathogen-Pathogen and Pathogen-Microbiome Interactions Within the Tick Holobiont

Area of Science:

• Microbiology
• Ecology
• Vector Biology

Background:

• Ticks host diverse microbial communities, including symbionts, commensals, and tick-borne pathogens (TBPs), collectively termed the tick holobiont.
• Tick physiology spatially structures these microbial communities across distinct tissues, creating unique ecological niches that influence microbial assembly and interactions.

Purpose of the Study:

• To integrate ecological theory with tick microbiome research to understand pathogen-microbiome interactions within tissue-structured communities.
• To propose a dual selective pressure framework explaining microbial network configuration and functional outcomes in the tick holobiont.

Main Methods:

• Literature review integrating ecological theory and current tick microbiome research.
• Analysis of how ecological filters (tick species, development, tissue, transmission, environment) shape microbiome assembly.
• Examination of how tick-borne pathogens modify microbial networks and community stability.

Main Results:

• Baseline ecological factors and tick-borne pathogens exert dual selective pressures on tick microbial communities.
• These pressures interact to shape microbial network structure, diversity, modularity, and resilience.
• Interactions within the tick holobiont influence vector competence and disease transmission potential.

Conclusions:

• Tick microbial communities are spatially structured ecological systems influenced by multilevel selective pressures.
• Understanding these interactions provides a framework for studying microbial communities in arthropod vectors.
• This knowledge can inform microbiome-based strategies to mitigate tick-borne diseases.