Early-Life Host-Microbial Interactions and Asthma Development: A Lifelong Impact?

Area of Science:

• Microbiology
• Immunology
• Pediatrics

Background:

• Childhood asthma is multifactorial, with growing evidence linking early-life microbial exposures to disease risk.
• The gut and respiratory tracts host distinct microbial communities that play crucial roles in immune system development.

Purpose of the Study:

• To review the current understanding of the gut, respiratory, skin, and fungal microbiomes' roles in childhood asthma development.
• To emphasize the critical timing of microbial exposures and their influence on the gut-lung axis.

Main Methods:

• Literature review of studies investigating the association between early-life microbial communities and asthma.
• Analysis of findings related to specific microbial taxa, short-chain fatty acids, and environmental exposures.

Main Results:

• Gut microbiota, including Faecalibacterium and Bifidobacterium, is linked to asthma protection via immune tolerance.
• Respiratory microbiota colonization by Streptococcus, Moraxella, and Haemophilus in early life is associated with increased asthma risk.
• Early-life disruptions, such as antibiotic use, can elevate asthma risk, though causality remains debated.

Conclusions:

• Early microbial exposures are critical determinants of childhood asthma pathophysiology.
• Further research is needed to elucidate cross-organ microbial interactions and the causal role of dysbiosis in asthma.