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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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Nucleic acid biosynthesis is a fundamental biochemical process that produces the purine and pyrimidine nucleotides essential for DNA and RNA synthesis. This pathway maintains a balanced nucleotide pool, preventing imbalances that could jeopardize genetic integrity and cellular function. Given the crucial role of nucleotides, their synthesis is tightly regulated to ensure proper cellular homeostasis.Purine BiosynthesisThe biosynthesis of purine nucleotides begins with ribose-5-phosphate, a...
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Phenylketonuria and the brain.

Valentina Rovelli1, Nicola Longo2

  • 1Clinical Department of Pediatrics, University of Milan, ASST Santi Paolo e Carlo, San Paolo Hospital, Milan, Italy.

Molecular Genetics and Metabolism
|April 27, 2023
PubMed
Summary
This summary is machine-generated.

Phenylketonuria (PKU) results from phenylalanine hydroxylase deficiency, leading to toxic phenylalanine buildup that damages the developing brain. This review details PKU

Keywords:
BrainHyperphenylalaninemiaNeurocognitive functionNeurologicPsychomotor delayphenylketonuria

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Area of Science:

  • Neuroscience
  • Biochemistry
  • Genetics

Background:

  • Classic phenylketonuria (PKU) stems from phenylalanine hydroxylase (PAH) deficiency, impairing phenylalanine (Phe) to tyrosine conversion.
  • Untreated PKU causes toxic Phe accumulation, impacting brain development and function based on exposure timing and levels.

Purpose of the Study:

  • To review the consequences of high phenylalanine levels in PKU.
  • To examine effects across different brain development stages in patients and animal models.

Main Methods:

  • Literature review of PKU effects on brain development.
  • Analysis of cognitive, behavioral, and neuropsychological outcomes.

Main Results:

  • Prenatal Phe exposure can cause microcephaly and neuronal loss.
  • Early childhood exposure leads to cognitive impairment and epilepsy.
  • Later exposure affects executive function, mood, and myelination.

Conclusions:

  • Phe toxicity impacts brain development and function variably across life stages.
  • Understanding these effects is crucial for managing PKU patients.
  • Further research into Phe-induced brain damage mechanisms is warranted.