Bacterial lipid structural diversity mediates commensalism and pathogenesis.

Bacterial membrane lipid structural diversity shapes how the human immune system recognizes commensal versus pathogenic bacteria via Toll-like receptor 2, Toll-like receptor 4, and CD1.

• Why it matters: The immune system must distinguish harmful pathogens from abundant symbionts, and lipid recognition is a key driver of downstream innate and adaptive responses.
• What they did: This review synthesizes evidence that host sensing of bacterial lipid structures through Toll-like receptor 2, Toll-like receptor 4, and CD1 lipid antigen presentation mediates immune outcomes.
• The result: Lipid variations in commensals are linked to less stimulatory or more immunomodulatory responses that support homeostatic immunity and gut physiology, while similar modifications in some pathogens enable immune evasion or modulation.

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