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[Thyroxine-binding proteins--familial euthyroid hyperthyroxinemia due to point mutations of transthyretin].

Some of the point mutations in transthyretin (TTR) exhibit increased affinity for thyroxine (T4) and result in euthyroid hyperthyroxinemia in affected individuals. TTR, also known as thyroxine binding prealbumin, is a homotetrameric plasma protein of MW 55,000 that transports 15% of serum T4. The known point mutations that cause euthyroid hyperthyroxinemia are Ala109 (ACC) to Thr (GCC) and Gly6 (GGT) to Ser (AGT). These mutations are transmitted by autosomal dominant inheritance. The laboratory findings are an elevated total T4, an increased free T4 index, a normal free T4, and normal levels of total and free triiodothyronine. The Thr109 mutation abolishes Fnu4HI restriction site, and the Ser6 mutation eliminates the Msp I restriction site.

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