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Iminopeptiduria, skin ulcerations, and edema in a boy with prolidase deficiency
The Journal of Pediatrics
|October 1, 1977
Insights
A boy with skin ulcers and lymphedema had a rare genetic disorder called prolidase deficiency. This condition caused him to excrete large amounts of specific peptides, impacting his health.
Area of Science:
- Biochemistry
- Genetics
- Pediatrics
Background:
- This study investigates a rare genetic disorder affecting peptide metabolism.
- Focuses on a pediatric case presenting with complex clinical symptoms.
Observation:
- A 12-year-old male exhibited recurrent skin ulceration, chronic generalized lymphedema, and mild intellectual disability.
- Massive excretion of dipeptides, predominantly glycylproline, was detected, with many containing proline or hydroxyproline residues.
Findings:
- Enzyme assays confirmed prolidase deficiency in the patient's red blood cells and fibroblasts.
- Low but detectable prolidase activity was observed in lymphoid cell cultures, similar to controls.
Implications:
- Highlights the critical role of prolidase in dipeptide metabolism and overall health.
- Suggests potential diagnostic markers and therapeutic targets for similar metabolic disorders.
- Underscores the link between specific enzyme deficiencies and multifaceted clinical presentations in children.
Abstract:
A 12-year-old boy with recurrent skin ulceration, chronic generalized lymphedema, and mild mental retardation was found to excrete massive amounts of dipeptides, most (but not all) of which had proline or hydroxyproline as the carboxyl terminal residue. Glycylproline predominated. Prolidase deficiency was demonstrated in red blood cells and in fibroblastic cells. Prolidase activity was present in continuous lymphoid cell cultures at the same low level observed in control cells.