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Published on: May 6, 2013
Relationship between type 1 diabetes and atopic diseases in a twin population
S F Thomsen1, D L Duffy, K O Kyvik
1Department of Respiratory Medicine, Bispebjerg Hospital, Copenhagen, Denmark. sft@city.dk
Aim:
To study the association between type 1 diabetes and atopic diseases in a twin population.
Methods:
We performed record linkage between questionnaire-defined atopic dermatitis, asthma and hay fever, and hospital discharge diagnoses of type 1 diabetes in 54,530 Danish twins, 3-71 years of age.
Results:
The age- and sex-adjusted risk of atopic dermatitis was decreased in subjects with type 1 diabetes compared with nondiabetic subjects, (2.1%vs 9.9%), odds ratio (OR)= 0.23 (0.07-0.71), P = 0.011, whereas asthma and hay fever were not significantly associated with type 1 diabetes. Within twin pairs discordant for type 1 diabetes, the diabetic twin had a lower risk of atopic dermatitis relative to the nondiabetic co-twin. Genetic factors for atopic dermatitis and type 1 diabetes were negatively correlated (r = -0.30), P = 0.0009.
Conclusions:
These findings substantiate the Th1 vs Th2 cell dichotomy for type 1 diabetes and atopic dermatitis, and indicate an inverse association between genetic factors for these disorders.
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