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Inborn Errors of Metabolism01:20

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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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Proteins are broken down into amino acids during digestion. Unlike fats and carbohydrates, which are stored for later use, proteins are not. Instead, amino acids are either used to produce ATP through oxidation or contribute to the creation of new proteins for the growth and repair of the body. Any surplus amino acids from the diet are converted into glucose or triglycerides rather than excreted.
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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...
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Drug distribution in the pediatric population exhibits unique challenges and considerations due to the physiological differences between children, particularly neonates and infants, and adults. A crucial aspect of pediatric pharmacology is understanding how these differences impact the pharmacokinetics of various drugs, necessitating age-specific dosing strategies to ensure efficacy and safety.Neonates and infants have a higher total body water content, ~75%–90% of their body weight,...
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Related Experiment Video

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One-step Metabolomics: Carbohydrates, Organic and Amino Acids Quantified in a Single Procedure
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Micronutrient status in phenylketonuria.

M Robert1, J C Rocha, M van Rijn

  • 1Nutrition and Metabolism Unit, Hôpital Universitaire des Enfants Reine Fabiola, Brussels, Belgium.

Molecular Genetics and Metabolism
|October 12, 2013
PubMed
Summary

Patients with phenylketonuria (PKU) require careful micronutrient monitoring due to dietary restrictions. This review highlights common deficiencies in zinc, selenium, iron, vitamin B12, and folate, emphasizing complex factors beyond intake.

Keywords:
IronMicronutrientsPKUSeleniumVitamin B(12)Zinc

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Area of Science:

  • Nutritional Science
  • Biochemistry
  • Pediatrics

Background:

  • Phenylketonuria (PKU) patients face unique challenges in maintaining optimal nutrient status.
  • Dietary management of PKU often involves significant intake from non-natural sources, increasing risk for micronutrient imbalances.

Purpose of the Study:

  • To review the prevalence of vitamin and mineral deficiencies in patients with PKU.
  • To identify factors influencing micronutrient status in PKU patients undergoing dietary treatment.

Main Methods:

  • Literature review of studies published since 1990.
  • Analysis of deficiency prevalence concerning age of treatment initiation, treatment type, dietary compliance, and practices.

Main Results:

  • Biological micronutrient inadequacies are frequently reported for zinc, selenium, iron, vitamin B12, and folate.
  • Deficiencies are influenced by age of treatment commencement, treatment type, and dietary compliance.

Conclusions:

  • Micronutrient supplementation is essential for PKU patients on dietary treatment.
  • Nutritional status in PKU is complex, influenced by multiple interrelated factors beyond simple dietary intake.