Allergic Rhinitis and Asthma: Genetic Linkage Regions

allergic rhinitis asthma
Allergic rhinitis and asthma are common comorbidities. Like asthma, the presence of a genetic component in allergic rhinitis has been well established. To identify genetic linkage regions unique to allergic rhinitis, as well as those shared by allergic rhinitis and asthma, a genome screen study was conducted. A total of 295 families in the French Epidemiological Study on the Genetics and Environment of Asthma (EGEA) containing 1317 subjects were genotyped for 396 microsatellite markers. The families included had two siblings with DNA available and at least one asthmatic subject. Three definitions of allergic rhinitis were used, two binary and one categorical. To investigate linkages specific to allergic rhinitis (without asthma), linkage analyses were also conducted in 185 families with at most one asthmatic sib. (more…)

Genetics Of Atopy In A Multiethnic European Population Reveals A Major Atopy Locus On Chromosome 3q21.3

atopy genetics

This study examined the genetic basis of sensitization to house dust mite allergy allergens. A genome scan was conducted using 603 microsatellite markers in 82 nuclear families (366 individuals) of German, British and Portuguese origin with at least two affected siblings. Sensitization to Dermatophagoides pteronyssinus was assessed by determining specific IgE antibody levels detected by immunochemiluminometric assay and immunosorbent assay and categorized as positive or negative relative to a predetermined cut-off point. (more…)