Constitutive nitric oxide synthase gene polymorphisms and house dust mite respiratory allergy in an Algerian patient group
Genetic polymorphisms in neuronal nitric oxide synthase (NOS1) and calmodulin-dependent endothelial NOS (NOS3) genes are known to influence the course of allergic respiratory disorders. We investigated the role of NOS1 −84 G→A and NOS3 −786 T→C, 894 G→T and 27 base pair (bp) repeat polymorphisms in 125 patients suffering from asthma and/or rhinitis and monosensitized against Dermatophagoides pteronyssinus(Dpter) and 111 controls from Algeria. We found a higher frequency of the −786 C NOS3 allele in patients than in controls [corrected P value (Pc) = 0.04], especially in female cases (Pc = 0.02) and that the ‘ab’ genotype of the 27-bp polymorphism was significantly associated with specific immunoglobulin E production against Dpter(P = 0.006). This study brings further support for the participation of NOS3 gene polymorphism in the pathogenesis of respiratory allergic disorders.