Recent research reports that there is no significant association between the widely studied genetic variant — rs7216389 in the ORMDL3 gene — and childhood asthma, challenging earlier research from several international populations. This finding, by researchers in Lahore, Pakistan, adds nuance to the global scientific effort to understand the genetic underpinnings of pediatric asthma, the most common chronic childhood disease worldwide.
In the multicenter, case‑control study, researchers analyzed the presence of the ORMDL3 rs7216389 polymorphism — previously linked to asthma in numerous European, Chinese and American studies — to determine its local relevance. The paper, “Association of the rs7216389 Polymorphism in Orosomucoid-Like 3 (ORMDL3) Gene With Childhood Asthma: A Multicenter Case-Control Study,” was published in the journal, Cureus.
The study, which was carried out across CMH Lahore Medical and Dental College, the University of Health Sciences and Children’s Hospital Lahore, evaluated 100 children between March 2021 and May 2022. Half of the participants had clinically confirmed asthma, while the other half served as healthy controls.
Despite expectations based on prior global research, investigators found no statistically significant relationship between the rs7216389 variant and asthma status in the Pakistani pediatric population. The heterozygous T/C genotype appeared most frequently among children with asthma (68%), yet this distribution did not differ significantly from pediatric participants without asthma.
Instead, the study identified environmental triggers — including seasonal changes, dust exposure and animal dander — as significantly associated with asthma symptom flare‑ups. According to the study, 60% of children with asthma reported symptoms worsening with seasonal shifts, highlighting the ongoing importance of environmental management in pediatric asthma care.
The study’s authors noted that the ORMDL3 gene, located on chromosome 17q21, has been a focal point of asthma genetics research for nearly two decades. Several international studies have linked the rs7216389 polymorphism with asthma susceptibility, including investigations in the United States, Europe, China and Jordan, they noted.
However, researchers noted that prior regional research in Pakistan also failed to establish a significant link — findings that this new study reinforces. Researchers suggest that differences in genetic background, population diversity, environmental exposures and sample size may explain why associations observed in other countries do not appear consistently in South Asian populations.
The authors noted several limitations, including:
- A modest sample size limiting statistical power
- Recruitment from a single geographic region
- A case‑control design that cannot establish causation
They recommended larger, geographically diverse cohorts and expanded genomic analyses in future research.
Although the findings challenge the assumption that rs7216389 is a universal genetic predictor of childhood asthma, researchers noted that they also underscore the complex interplay of genes and environment in shaping disease risk. They further emphasized that asthma remains a multifactorial condition, and identifying meaningful genetic contributors will require broader, more diverse datasets.
