THYROXINE‐BINDING PREALBUMIN GENE POLYMORPHISM: A POPULATION STUDY

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Abstract
SUMMARY: The human thyroxine‐binding prealbumin (TBPA) gene was examined for restriction fragment length polymorphism (RFLP) in normal subjects and a subject with euthyroid hyperthyroxinaemia, due to increased thyroxine binding by TBPA, using 16 restriction enzymes. Only Taq I and Msp I were shown to detect RFLPs. In a male of the normal population and one of his daughters, an additional Taq I site was found in the 3|M′‐flanking region of the TBPA gene. The RFLP in a subject with euthyroid hyperthyroxinaemia was due to the deletion of a MspI site. All three subjects with RFLPs were heterozygous.