Overview
Childhood asthma is not a single, uniform disease. Some children develop symptoms early in life, while others become symptomatic later. This study looked at whether changes in gene activity in the blood during early childhood could help explain who goes on to develop asthma and which immune pathways are involved over time.
The researchers found a clear shift in immune signaling: at age 1 year, children who later developed asthma showed a gene pattern linked mainly to neutrophilic inflammation and activation of the NLRP3 inflammasome. By 4.5 years of age, this pattern changed to a persistent eosinophil-related signature that remained present through 10.5 years. This suggests that the period between 1 and 4.5 years may be a particularly vulnerable window for the development of asthma biology.