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Phenylketonuria (PKU) is a protein metabolism disorder characterized by high blood levels of the amino acid phenylalanine. This results from a mutation in the gene responsible for phenylalanine hydroxylase, an enzyme that converts phenylalanine into tyrosine. When this enzyme is deficient, phenylalanine builds up in the blood, leading to symptoms such as vomiting, rashes, seizures, growth deficiency, and severe mental retardation. An early diagnosis and a diet restricting phenylalanine intake...
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The kidneys are intricate organs with millions of working units known as nephrons. Each nephron features two major structures: the renal corpuscle, which facilitates blood plasma filtration, and the renal tubule, which handles the glomerular filtrate. Blood supply is directly linked to the nephrons. The renal corpuscle consists of the glomerulus, a capillary network, and the Bowman's capsule, a double-walled epithelial structure that encases the glomerulus. The filtering of blood plasma...
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Drug binding to proteins is a complex phenomenon influenced by various drug-related factors, each playing a significant role in the interaction between drugs and proteins within the body.
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Updated: Jul 6, 2025

Use of Ultra-high Field MRI in Small Rodent Models of Polycystic Kidney Disease for In Vivo Phenotyping and Drug Monitoring
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[Type I Hyperprolinemia - What about the Kidney?]

Manuela Rizzo1, Maria Amicone1, Maria Luigia Sellitti1

  • 1Dipartimento di Sanità Pubblica, Università degli Studi di Napoli "Federico II", Napoli, Italia.

Giornale Italiano Di Nefrologia : Organo Ufficiale Della Societa Italiana Di Nefrologia
|December 29, 2023
PubMed
Summary
This summary is machine-generated.

Type I Hyperprolinemia (HPI), a rare genetic disorder, is typically linked to neuropsychiatric issues. This study highlights HPI diagnosis in an adult due to kidney impairment, suggesting broader diagnostic considerations.

Keywords:
genetic nephropathyhyperprolinemiamalformative urinary diseasetype I hyperprolinemia

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Area of Science:

  • Genetics
  • Metabolic Disorders
  • Nephrology

Background:

  • Type I Hyperprolinemia (HPI) is a rare genetic disorder affecting the proline metabolic pathway, typically diagnosed in children with neuropsychiatric symptoms.
  • While malformative urinary disease is associated with HPI, diagnosis solely based on kidney impairment is not documented.

Observation:

  • A case report of an adult diagnosed with HPI secondary to chronic kidney disease from obstructive nephropathy.
  • Family study revealed the father had a 22q11.21 deletion and elevated blood proline levels without clinical anomalies.

Findings:

  • This case demonstrates HPI can be diagnosed in adulthood due to kidney impairment, challenging the pediatric-centric diagnostic paradigm.
  • Identified a 22q11.21 deletion in the patient and father, linking genetic factors to HPI and kidney issues.

Implications:

  • Suggests considering HPI in adults with congenital urinary malformations and kidney disease, even with subtle neurological symptoms.
  • Recommends evaluating rare genetic alterations like 22q11.21 deletion and PRODH mutations in patients with unexplained urinary tract abnormalities.
  • Highlights the importance of a broader differential diagnosis for HPI, extending beyond typical neuropsychiatric presentations.