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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...
Overview of Protein Metabolism01:21

Overview of Protein Metabolism

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.
Amino acids play various roles in the body once they are absorbed into cells. They are restructured...
Pharmacokinetics in Pediatric Patients: Drug Metabolism01:24

Pharmacokinetics in Pediatric Patients: Drug Metabolism

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...
Pharmacogenetics of Phase II Enzymes: N-acetyltransferase, Thiopurine S-methyltransferase, UDP-glucuronosyltransferase01:27

Pharmacogenetics of Phase II Enzymes: N-acetyltransferase, Thiopurine S-methyltransferase, UDP-glucuronosyltransferase

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...
Diabetic Ketoacidosis l: Introduction01:25

Diabetic Ketoacidosis l: Introduction

DefinitionDiabetic ketoacidosis (DKA) is an acute, life-threatening complication of diabetes mellitus, characterized by a triad of hyperglycemia (blood glucose >250 mg/dL), ketonemia or ketonuria, and metabolic acidosis (arterial pH <7.30 and serum bicarbonate <18 mEq/L). It results from insulin deficiency combined with elevated levels of counterregulatory hormones—glucagon, catecholamines, cortisol, and growth hormone—leading to increased lipolysis, hepatic ketone production, and...
Pharmacokinetics in Pediatric Patients: Overview and Drug Absorption01:23

Pharmacokinetics in Pediatric Patients: Overview and Drug Absorption

Understanding the physiological differences in the pediatric population is crucial for effective pharmacotherapy. Neonates, infants, and children exhibit significant variations in gastric pH, gastric emptying time, intestinal transit time, and biliary function. These variations profoundly affect oral drug absorption, necessitating a nuanced approach to pediatric dosing.Neonates present with a unique physiological profile, having a gastric pH greater than 4 and faster and more irregular gastric...

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Related Experiment Video

Updated: Jun 21, 2026

Functional Complementation Analysis (FCA): A Laboratory Exercise Designed and Implemented to Supplement the Teaching of Biochemical Pathways
09:27

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[Phenylketonuria].

Harri Niinikoski1, Jaana Heikkilä, Kirsti Näntö-Salonen

  • 1TYKS:n lastenklinikka, Kiinamyllynkatu 4-8, 20520 Turku.

Duodecim; Laaketieteellinen Aikakauskirja
|July 10, 2009
PubMed
Summary
This summary is machine-generated.

Phenylketonuria (PKU) is a rare genetic disorder in Finland but increasing immigration may raise its incidence. Early diagnosis and a low-phenylalanine diet are crucial to prevent severe intellectual disability in affected newborns.

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Area of Science:

  • Medical genetics
  • Metabolic disorders
  • Biochemistry

Context:

  • Phenylketonuria (PKU) is a rare genetic disorder in Finland due to specific population genetics.
  • Immigration from regions with higher PKU incidence is projected to increase its prevalence in Finland.
  • The disorder results from a deficiency in phenylalanine hydroxylase, impairing phenylalanine metabolism.

Purpose:

  • To highlight the changing epidemiology of phenylketonuria in Finland.
  • To emphasize the critical role of early detection and management of PKU.
  • To underscore the importance of dietary phenylalanine restriction for preventing neurological damage.

Summary:

  • Phenylketonuria (PKU) is an inherited metabolic disorder where the enzyme phenylalanine hydroxylase is deficient.
  • This deficiency leads to toxic accumulation of phenylalanine in the body, severely affecting the central nervous system.
  • Newborns with PKU are asymptomatic but require immediate dietary intervention to prevent irreversible intellectual disability.

Impact:

  • Increased awareness of PKU's potential rise in Finland due to demographic shifts.
  • Reinforces the necessity of timely diagnosis and lifelong management strategies for PKU patients.
  • Promotes understanding of the metabolic pathway disruption and its severe neurological consequences in untreated PKU.