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The Journal of Clinical Endocrinology & Metabolism Vol. 85, No. 2 536-539
Copyright © 2000 by The Endocrine Society

Original Studies

A Population-Based Study of Chronic Autoimmune Hypothyroidism in Danish Twins1

Thomas Heiberg Brix, Kirsten Ohm Kyvik and Laszlo Hegedüs

Department of Endocrinology M, Odense University Hospital (T.H.B., L.H.), and the Danish Twin Register, Odense University (T.H.B., K.O.K.), DK-5000 Odense C, Denmark

Address all correspondence and requests for reprints to: Dr. Thomas Heiberg Brix, The Danish Twin Register, Odense University, Winsløwparken 15 st., DK 5000 Odense C, Denmark. E-mail: tBRIX{at}HEALTH SDU.OK.

Hashimoto’s thyroiditis (HT), atrophic thyroiditis (AT), and Graves’ disease are autoimmune thyroid diseases in which genetic factors are suspected to play an important role in disease susceptibility. In a recent population-based twin study we rendered it probable that a substantial part of the susceptibility to Graves’ disease is attributable to genetic factors. At present there are no population-based twin studies supporting such a genetic influence in the etiology of HT/AT.

To elucidate whether there is a genetic influence in the etiology of HT/AT, we studied the distribution of HT/AT in a population-based sample of 2945 Danish female-female twin pairs (5890 individuals) born between 1953 and 1972. Information on hypothyroidism was obtained from a nationwide questionnaire survey in 1994. Information from hospitals, out-patient clinics, general practitioners, and specialists was sought to verify the diagnosis.

The overall prevalence of autoimmune hypothyroidism was 0.41% (24 of 5890). The prevalence did not differ between monozygotic and dizygotic twins (0.42% and 0.40%, respectively). The crude probandwise concordance rates were significantly higher for monozygotic compared to dizygotic twin pairs: 0.55 (95% confidence interval, 0.23–0.83) vs. 0.0 (95% confidence interval, 0.0–0.25; P = 0.01). All of the healthy cotwins (n = 15) of twins with clinically overt autoimmune hypothyroidism were biochemically euthyroid. Overall, regardless of zygosity 53% (8 of 15) of the healthy cotwins were positive for antithyroid antibodies. The prevalence of autoantibodies among the monozygotic cotwins was 80% (4 of 5) and 40% (4 of 10) among dizygotic cotwins (P = 0.36).

In conclusion, the higher concordance rate in monozygotic compared to dizygotic pairs indicates that genetic factors play a role in the etiology of HT/AT among Caucasian women living in areas with borderline iodine deficiency. However, the fact that the concordance rate among MZ twins was below 1 suggests that environmental factors also are of etiological importance.




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