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Related Concept Videos

Inborn Errors of Metabolism01:20

Inborn Errors of Metabolism

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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In pediatric care, understanding the nuances of hepatic drug metabolism is crucial, as it significantly differs from that of adults. This divergence is primarily due to the developmental stage of drug-metabolizing enzymes, which affects how medications are processed in the body. In neonates, for instance, the activity of Phase I enzymes—critical for the initial breakdown of drugs—is markedly reduced, functioning at just 20–40% of the levels seen in adults. This reduction poses a challenge in...
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Phase II biotransformation reactions are essential for detoxifying and eliminating xenobiotics, including many pharmaceutical compounds. These reactions typically involve conjugation, the covalent attachment of polar endogenous groups such as glucuronic acid, sulfate, methyl, or acetyl moieties to functional groups introduced during Phase I metabolism. The resulting conjugates are more water-soluble, enabling efficient renal or biliary excretion.The major classes of Phase II enzymes include...
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A Treatment Package without Escape Extinction to Address Food Selectivity
04:23

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Published on: August 21, 2015

[Phenylketonuria: new treatments].

F Feillet1, C Bonnemains

  • 1Centre de référence des maladies héréditaires du métabolisme de Nancy, hôpital d'enfants, CHU de Brabois, 54500 Vandœuvre-les-Nancy, France.

Archives De Pediatrie : Organe Officiel De La Societe Francaise De Pediatrie
|August 6, 2013
PubMed
Summary

Phenylketonuria (PKU) management relies on a low phenylalanine diet, but compliance wanes. New treatments like sapropterin and others under investigation offer improved therapeutic options for PKU patients.

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Area of Science:

  • Biochemistry
  • Metabolic Disorders
  • Genetics

Context:

  • Phenylketonuria (PKU) is a rare genetic disorder.
  • The primary treatment for PKU has been a lifelong low phenylalanine diet for over 50 years.
  • Dietary compliance, particularly post-adolescence, presents a significant challenge for PKU patients.

Purpose:

  • To review current and emerging therapeutic strategies for phenylketonuria (PKU).
  • To highlight the limitations of traditional dietary management and the need for alternative treatments.
  • To provide an overview of pharmacological and investigational PKU therapies.

Summary:

  • The low phenylalanine diet is the cornerstone of PKU management but faces compliance issues.
  • Sapropterin dihydrochloride (Kuvan®) is an approved medication that benefits a subset of PKU patients.
  • Emerging treatments include glycomacropeptides, large neutral amino acids, phenylalanine ammonia lyase, chaperones, and gene therapy.

Impact:

  • Advances in PKU treatment offer improved patient outcomes and quality of life.
  • Expanding therapeutic options addresses the unmet needs of PKU patients with poor dietary adherence.
  • Future research in PKU therapies holds promise for more effective and personalized management strategies.