Genetic markers of atopy in infancy: results from the German Multicenter Allergy Study

Genetic studies of atopy-associated traits require unambiguous phenotypes t o avoid both type 1 and 2 errors. The German Multicenter Allergy Study has provided a birth cohort with longitudinally well defined and stable phenoty pes. We summarize data on candidate gene studies on chromosomes 12q, 5q, an d 13q using high total IgE and atopic dermatitis (AD) as the most common at opy associated phenotypes in early childhood. We also present data on a fun ctional RANTES promoter polymorphism that we recently identified. A signifi cantly higher frequency of the mutant allele was seen in individuals of Afr ican descent compared to Caucasian subjects. In addition, an association of the polymorphism with AD could be demonstrated in the MAS cohort. Although the statistical approaches are limited, the MAS cohort has provided a valu able population for candidate gene studies in atopy.