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High urinary excretion of N-(pyrrole-2-carboxyl) glycine in type II hyperprolinemia
M Wajner1, C M Wannmacher, P Purkiss
1Departamento de Bioquímica, Instituto de Biociências, UFRGS, Porto Alegre RS, Brasil.
Insights
Type II hyperprolinemia, a rare metabolic disorder, was investigated in a 5-year-old boy with developmental delay and seizures. High urinary levels of a specific N-acylglycine conjugate were identified, suggesting a potential link to clinical symptoms.
Area of Science:
- Biochemistry
- Genetics
- Pediatrics
Background:
- Type II hyperprolinemia is a rare inherited metabolic disorder.
- Recent classifications suggest it may be benign, but symptomatic variants are possible.
- Understanding its biochemical basis is crucial for accurate diagnosis and management.
Observation:
- A 5-year-old boy presented with mild developmental delay, recurrent grand mal seizures, and EEG abnormalities.
- Biochemical investigation focused on the metabolic profile of the patient.
- Urinary analysis revealed high concentrations of N-(pyrrole-2-carboxylic acid)-glycine conjugate.
Findings:
- The case report details the biochemical investigation of type II hyperprolinemia.
- Elevated urinary excretion of N-(pyrrole-2-carboxylic acid)-glycine conjugate was a key finding.
- This specific urinary compound had been reported in only one prior study of this disorder.
Implications:
- This case highlights that type II hyperprolinemia may present with significant clinical symptoms, challenging the notion of it being solely benign.
- The identification of N-(pyrrole-2-carboxylic acid)-glycine conjugate provides further biochemical evidence for this specific variant.
- Further research is warranted to elucidate the full spectrum of clinical manifestations and the precise role of this metabolite in type II hyperprolinemia.
Abstract:
A case report of type II hyperprolinemia in a 5-year-old boy and its biochemical investigation is presented. The child has mild developmental delay, recurrent seizures of the grand mal type and EEG alterations. Although this disorder has been recently considered a benign condition, variants accompanied by characteristic symptomatology cannot be fully ruled out. The urinary excretion of high concentrations of N-(pyrrole-2-carboxylic acid)-glycine conjugate is stressed, since it appears that only one previous report in the literature described this compound in the urine of two patients affected by this disturbance.