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Related Experiment Videos

Euthyroid hyperthyroxinemia due to a generalized 5'-deiodinase defect.

N Kleinhaus1, J Faber, L Kahana

  • 1Institute of Endocrinology, Linn Central Clinic, Haifa, Israel.

The Journal of Clinical Endocrinology and Metabolism
|April 1, 1988
PubMed
Summary
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This study identified a rare syndrome of generalized 5-deiodinase deficiency in an 11-year-old girl with asymptomatic hyperthyroxinemia. Her thyroid hormone levels suggest impaired peripheral deiodination pathways.

Area of Science:

  • Endocrinology
  • Molecular Biology
  • Genetics

Background:

  • Thyroid hormone deiodination is crucial for regulating hormone activity.
  • Deficiencies in deiodinase enzymes can lead to thyroid hormone imbalances.

Observation:

  • An 11-year-old girl presented with asymptomatic hyperthyroxinemia and elevated serum free thyroxine (T4).
  • She exhibited low normal serum triiodothyronine (T3) and low 3,5-diiodothyronine (3,5-T2) levels.
  • Markedly elevated reverse triiodothyronine (rT3) and 3',5'-T2 levels were observed, with low 3,3'-T2.
  • The patient had a goiter, exaggerated TSH response to TRH, and elevated thyroid radioiodine uptake.

Findings:

  • Data suggest reduced peripheral 5'-deiodination of both T4 and T3.
  • Evidence points to reduced 5'-deiodination of rT3 and 3',5'-T2, and potentially thyrotroph T4 5'-deiodination.

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  • These findings indicate a generalized 5'-deiodinase deficiency syndrome.

    • Implications:

    • This case may represent a previously unrecognized syndrome.
    • Understanding deiodinase function is vital for diagnosing and managing thyroid disorders.
    • Further research is needed to elucidate the genetic basis and full clinical spectrum of this deficiency.