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PubMed1988

A study on the inheritance of thyroxine-binding globulin (TBG) deficiency from data obtained in 13 families detected by a neonatal screening program.

Thirteen families with thyroxine-binding globulin deficiency, detected through probands screened by the Quebec Network of Genetic Medicine, were investigated. These families were divided into two groups, depending on whether hemizygous males had low or undetectable serum thyroxine-binding globulin levels. Five families belonged to the low (hypo-TBGnemic) type while the remaining 8 families belonged to the absent (a-TBGnemic) type. On pedigree analysis, 10 families satisfied the requirements for an X-linked co-dominant mode of transmission. Three families, 2 a-TBGnemic and 1 hypo-TBGnemic, did not satisfy these requirements and three hypotheses had to be put forward to explain these situations: an autosomal recessive mode of transmission, a spontaneous mutation, or an extreme lyonisation of the defective X. Since the thyroxine-binding globulin gene has been localized to the X-chromosome, the two latter explanations appear to be the most plausible.

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