Genes, guts, and microbes: decoding host-driven microbial regulation using intestine-specific conditional knockouts

Area of Science:

• Microbiology and Genetics
• Host-Microbe Interactions
• Gastroenterology

Background:

• The gut microbiota plays a crucial role in host health.
• Understanding host genetic influence on the gut microbiome is vital.
• Existing models often have systemic effects, limiting specific genetic insights.

Purpose of the Study:

• To review the role of host genetics in regulating gut microbiota composition and function.
• To highlight the utility of intestine-specific conditional knockout (cKO) models.
• To elucidate host-driven mechanisms governing gut microbial ecology.

Main Methods:

• Narrative review of existing literature.
• Analysis of studies utilizing intestine-specific conditional knockout (cKO) models.
• Examination of Cre-loxP technology for precise gene deletion in intestinal cells.

Main Results:

• Host genes actively regulate gut microbiota via barrier integrity, immune defenses, and metabolic signaling.
• Disruption of these host pathways leads to dysbiosis and increased pathobionts.
• Intestine-specific cKO models effectively isolate host genetic effects from systemic influences.

Conclusions:

• Host genetics are central to maintaining gut microbial symbiosis.
• Targeting host pathways offers a promising therapeutic strategy for gut dysbiosis and related disorders.
• The gut functions as an active regulator of the microbiota, not a passive environment.