Towards Key Principles of Host-Associated Microbiome Assembly

Area of Science:

• Microbial ecology
• Systems biology
• Ecological modeling

Background:

• Symbiotic relationships involve complex microbial communities crucial for host health and ecological dynamics.
• Community structure is influenced by individual-level mechanisms like dispersal, host selection, and microbe-resource interactions.
• Understanding the interplay of these mechanisms in microbiome assembly remains a challenge.

Purpose of the Study:

• To present a mechanistic model explaining how distinct microbial community structures arise.
• To bridge mechanistic modeling with empirical microbiome data.
• To explore the generalizability of microbiome assembly mechanisms across different host systems.

Main Methods:

• Developed a model to describe microbiome assembly from individual-level processes.
• Simulated microbiome data from marine sponges to validate the model.
• Applied the model to human microbiome data for cross-system relevance.

Main Results:

• The model successfully links individual microbial processes to community-level patterns.
• Simulations with marine sponge data demonstrated the model's ability to replicate empirical patterns.
• Application to human data suggests a core set of mechanisms govern diverse microbiome structures.

Conclusions:

• Individual-level microbial processes are key drivers of community-scale microbiome assembly.
• A unified set of ecological mechanisms may explain microbiome patterns across diverse hosts.
• This work advances ecological theory by connecting micro- and macro-level processes in symbiosis.