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[Juvenile form of tyrosinemia type I]
1Abteilung Allgemeine Pädiatrie der Universitätskinderklinik Tübingen.
Insights
Juvenile type I tyrosinemia, a rare inherited metabolic disorder, presents with severe liver and kidney issues. Early diagnosis through genetic testing and biochemical markers is crucial for managing this condition.
Area of Science:
- Biochemistry
- Genetics
- Pediatrics
Background:
- Juvenile type I tyrosinemia is a rare, autosomal-recessive inherited metabolic disorder.
- It results from a deficiency in fumarylacetoacetase, an enzyme crucial for tyrosine metabolism.
Observation:
- A 1-year-old Turkish boy with consanguineous parents presented with disorientation, hepatosplenomegaly, and rickets.
- Clinical manifestations included hepatic dysfunction, rickets, and Fanconi's syndrome with acidosis.
Findings:
- Elevated blood tyrosine and methionine levels were observed.
- Pathognomic findings included heavy succinylacetonuria and absent fumarylacetoacetase activity in fibroblasts.
Implications:
- This case highlights the importance of recognizing clinical signs for early diagnosis of tyrosinemia.
- Understanding the etiology, biochemistry, and clinical spectrum aids in differential diagnosis and therapeutic strategies.
Abstract:
A 1-3/12-year-old Turkish boy born of consanguineous parents was hospitalized in poor general condition with disorientation, hepatosplenomegaly, and rickets. Laboratory tests showed pronounced symptoms of hepatic dysfunction, rickets, and Fanconi's syndrome with acidosis. The diagnosis juvenile type I tyrosinemia was based on the anamnesis, hepatorenal symptoms, and elevated tyrosine and methionine blood levels as well as the pathognomic findings of heavy succinylacetonuria and absent fumarylacetoacetase activity in the fibroblasts. Etiology, pathobiochemistry, clinical symptoms, differential diagnosis, and therapy of this rare autosomal-recessive inherited metabolic disease were discussed.