Objective: To report a family of familial dysalbuminaemic hyperthyroxinaemia(FDH).
Methods: Four members, including the female proband, mother, daughter and brother, went through the measurement of thyroid hormone and thyroid-stimulating hormone (TSH). Electrophoretic analysis of the patient's serum proteins was carried out after the patient's serum being incubated with fluorescein isothiocyanate (FITC) labeled thyroxine(T4), The point mutation of Alb gene was determined in all members.
Results: The measurements of thyroid hormane and TSH showed that in three members (the proband, her mother and her daughter), the total thyroxine(TT4) serum level was high, the total triiodothyronine(TT3), FT4, FT3 and TSH serum levels were normal. And the enhanced albumin binding of fluorescenced T4 by electrophoresis showed a mutation transition 653 G-->A on DNA coding region of albumin. But in the proband's brother, the thyroid function and the results of electrophoresis of thyroxine-binding protein and determination of albumin gene were normal.
Conclusion: A family with FDH in China is firstly reported here, a mutation at albumin gene DNA coding region 653G-->A causing enhanced albumin binding of T4 results in high T4 level.
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