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In order to evaluate the possible role of genetic factors in the pathogenesis of congenital hypothyroidism (CH), we investigated the occurrence of chromosome aberrations in a consecutive series of 47 patients with CH and 208 matched healthy controls. No abnormal karyotype was found in CH patients. In 5 CH patients and in 3 healthy controls a number of heterochromatin variants was detected. Although chromosomal variants are devoid of phenotypic effects, the frequency of these variants was higher in CH patients than in the control group (10.6% vs 1.4%, p less than 0.005). These findings suggest that the association of congenital hypothyroidism with chromosomal variants may reflect more than chance concurrence.
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