TITLE

Heredity in sarcoidosis: a registry-based twin study

AUTHOR(S)
Sverrild, A.; Backer, V.; Kyvik, K. O.; Kaprio, J.; Milman, N.; Svendsen, C. B.; Thomsen, S. F.
PUB. DATE
October 2008
SOURCE
Thorax;Oct2008, Vol. 63 Issue 10, p894
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Background: Sarcoidosis is a multiorgan granulomatous inflammatory disease of unknown aetiology. Familial clustering of cases and ethnic variation in the epidemiology suggests a genetic influence on susceptibility to the disease. This paper reports twin concordance and heritability estimates of sarcoidosis in order to assess the overall contribution of genetic factors to the disease susceptibility. Methods: Monozygotic and dizygotic twins enrolled in the Danish and the Finnish population-based national twin cohorts (61 662 pairs in total) were linked to diagnostic information on sarcoidosis obtained from the Danish National Patient Registry or the Social Insurance Institution, Finland registry of reimbursed medication using the 8th and 10th editions of the International Classification of Diseases. The Fisher exact test was used to compare probandwise concordance rates in different zygosity groups. Heritability was estimated based on a multi-factorial threshold liability model. Results: A total of 210 twin pairs with at least one proband with a diagnosis of sarcoidosis were identified. The probandwise concordance rate was higher in monozygotic than in dizygotic twins (0.148 vs 0.012). Compared with the general population there was an 80-fold increased risk of developing sarcoidosis in co-twins of affected monozygotic brothers or sisters. The increased risk in dizygotic twins was only 7-fold. Aetiological model fitting gave a heritability of sarcoidosis of 0.66 (95% Cl 0.45 to 0.80). Conclusions: This study suggests that genetic factors play an important role in the susceptibility to sarcoidosis. This result should encourage the search for molecular genetic markers of susceptibility to the disease.
ACCESSION #
35024640

 

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