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A family with hereditary high serum thyroxine-binding globulin
M Komatsu1, N Hanamura, T Seki
1Department of Surgery, Okaya-enrei Hospital, Japan.
Endocrine Journal
|August 1, 1994
Summary
This study investigates a family with hereditary high thyroxine-binding globulin (TBG). The findings suggest a potential genetic abnormality in TBG synthesis, as other causes were ruled out.
Area of Science:
- Endocrinology
- Human Genetics
Background:
- Thyroxine-binding globulin (TBG) is crucial for thyroid hormone transport.
- Hereditary alterations in TBG levels can impact thyroid hormone dynamics.
Observation:
- A family presented with clinically euthyroid individuals exhibiting high serum TBG, total T4, and total T3.
- Affected members, including the propositus, mother, and sister, had normal free T4, free T3, and TSH levels.
- The father's thyroid function remained within the normal range.
Findings:
- Secondary causes of elevated TBG, such as liver disease, estrogen therapy, or pregnancy, were excluded.
- Isoelectric focusing revealed normal microheterogeneity of TBG, ruling out common variations.
- The study identified a hereditary pattern of high TBG without overt hyperthyroidism.
Implications:
- The observed condition points towards a potential genetic defect in TBG synthesis.
- Further research is needed to elucidate the precise molecular mechanism underlying this hereditary condition.
- Understanding hereditary high TBG is important for accurate interpretation of thyroid function tests.