The -2549 -2567 del18 Polymorphism in VEGF and Irreversible Bronchoconstriction in Asthmatics

Area of Science:

• Pulmonary Medicine
• Genetics
• Molecular Biology

Background:

• Vascular Endothelial Growth Factor (VEGF) is crucial in diseases like cancer, but its role in asthma and airway remodeling is understudied.
• Genetic variations in VEGF may influence asthma pathogenesis and airway remodeling potential.

Purpose of the Study:

• To investigate the association between VEGF gene polymorphism (del/ins at -2549 -2567) and airway remodeling in asthma.
• To evaluate this genetic factor's role in asthmatics with and without irreversible bronchoconstriction.

Main Methods:

• Genotyping of the VEGF 18-bp deletion/insertion polymorphism using PCR in 82 asthma patients and 40 controls.
• Analysis included patients with irreversible and reversible bronchoconstriction, considering smoking status and disease duration.

Main Results:

• The del/del genotype was more prevalent in asthma patients (74.39%) and those with irreversible bronchoconstriction (80.95%).
• A significant association was found between the del/del genotype and irreversible bronchoconstriction (OR=3.48, P=.012).
• Irreversible bronchoconstriction was also linked to higher smoking rates and longer disease duration.

Conclusions:

• The del18 genotype in the VEGF gene promoter is a risk factor for irreversible bronchoconstriction in asthma.
• Disease duration and smoking status are also significant factors contributing to irreversible airway changes in asthma.