Document Detail

The relative importance of genetic and environmental factors in the aetiology of thyroid nodularity: a study of healthy Danish twins.
MedLine Citation:
PMID:  15730424     Owner:  NLM     Status:  MEDLINE    
BACKGROUND: A large proportion of healthy, euthyroid, nongoitrous individuals have thyroid nodules. The aetiology of these ultrasonographically detected morphological abnormalities is largely unknown. Factors such as age, gender, iodine intake, smoking and parity are associated with nodularity of the thyroid. Whether there is a genetic susceptibility is unclear. AIM: To gain insight into the aetiology of thyroid nodularity by investigating a large cohort of healthy euthyroid monozygotic and dizygotic twins. DESIGN: A cross-sectional twin study. PARTICIPANTS: A representative sample of self-reported healthy twin pairs was identified through the Danish Twin Registry. A total of 520 individuals divided into 104 monozygotic (MZ), 107 dizygotic same sex (DZ) and 49 opposite sex (OS) twin pairs were investigated. MEASUREMENTS: Probandwise concordance and tetrachoric correlations. Quantitative genetic modelling was used to elucidate the relative importance of genetic and environmental effects for the variation in the liability of nodularity. RESULTS: A higher concordance rate for thyroid nodularity was found in MZ twins [0.57 (95% CI 0.36-0.76)] than in DZ twins [0.36 (95% CI 0.17-0.56, P = 0.074)]. The same was true for tetrachoric correlations: 0.67 (95% CI 0.34-0.87) in MZ twins and 0.17 (CI - 0.28-0.56, P = 0.053) in DZ twins. The difference, although not significant, was more pronounced for multiple nodules than for solitary nodules. Controlling for covariates (age, gender and smoking habits), it was calculated that genetic factors accounted for 67% (95% CI 35-87%) and environmental factors for 33% (95% CI 13-65%) of the individual differences in the liability to thyroid nodularity. CONCLUSIONS: This study suggests that genetic factors are of aetiological importance for thyroid nodularity in clinically healthy and euthyroid individuals, and indicates a difference in the aetiology of solitary and multiple thyroid nodules.
Pia Skov Hansen; Thomas Heiberg Brix; Finn Noe Bennedbaek; Steen Joop Bonnema; Ivan Iachine; Kirsten Ohm Kyvik; Laszlo Hegedüs
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Twin Study    
Journal Detail:
Title:  Clinical endocrinology     Volume:  62     ISSN:  0300-0664     ISO Abbreviation:  Clin. Endocrinol. (Oxf)     Publication Date:  2005 Mar 
Date Detail:
Created Date:  2005-02-25     Completed Date:  2005-06-16     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0346653     Medline TA:  Clin Endocrinol (Oxf)     Country:  England    
Other Details:
Languages:  eng     Pagination:  380-6     Citation Subset:  IM    
Department of Endocrinology M, Odense University Hospital, Odense C, Denmark.
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MeSH Terms
Cross-Sectional Studies
Diseases in Twins / etiology,  genetics*
Genetic Predisposition to Disease*
Middle Aged
Regression Analysis
Risk Factors
Thyroid Nodule / etiology,  genetics*
Twins, Dizygotic
Twins, Monozygotic

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