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Thyroid autoimmunity is one of the most common immune disorders in females, and its polygenic background remains to be elucidated. The human leukocyte antigen (HLA) DQ region of chromosome 6 has been shown to confer susceptibility to thyroid autoimmune disease. The aim of our present investigation was to determine whether the transmission of high risk HLA DQ to patients with thyroid autoimmunity differs when transmission is from fathers as opposed to when transmission is from mothers. We studied 91 juvenile patients with chronic lymphocytic thyroiditis (68 females and 23 males; mean age, 10.5 +/- 3.9 yr), 12 patients with Graves' disease (all females; mean age, 8.8 +/- 4.0 yr), 53 healthy siblings, and their parents for thyroid function, antibodies, ultrasound, and DNA typing for HLA DQ susceptibility alleles. We observed an increased rate of transmission for the DQA1*0501-DQB1*0201 (DQ2) haplotype [35 of 53 transmitted (66%); P = 0.02]. This allele was preferentially transmitted by fathers [21 of 27 (78%); P &lt; 0.004], whereas the maternal DQ2 haplotypes were not transmitted more often than expected. Subsequently, families were stratified as follows according to the parental thyroid peroxidase antibody (TPOAb) status: no parent, only mothers, only fathers, and both parents positive. There was no significant maternal transmission disequilibrium in any subset, but the paternal HLA DQ2 was preferentially transmitted [11 of 14 cases (79%); P = 0.03] in the group of TPOAb-positive mothers, and we observed a similar trend in the group of TPOAb- positive fathers (P = 0.08). Also, the portion of offspring affected by Graves' disease was significantly higher in TPOAb-positive than in TPOAb-negative fathers (P &lt; 0.02). In conclusion, our findings demonstrate a significant effect of paternal HLA DQ alleles as well as antibody status on susceptibility to thyroid autoimmune disease in juvenile patients.

the journal of clinical endocrinology and metabolism/journal of clinical endocrinology and metabolism

Familial Clustering of Juvenile Thyroid Autoimmunity: Higher Risk Is Conferred by Human Leukocyte Antigen DR3-DQ2 and Thyroid Peroxidase Antibody Status in Fathers