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Creatine deficiency syndromes.

Andreas Schulze1

  • 1Division of Metabolic and Endocrine Diseases, University Children's Hospital, Heidelberg, Germany. andreas_schulze@med.uni-heidelberg.de

Molecular and Cellular Biochemistry
|April 19, 2003
PubMed
Summary
This summary is machine-generated.

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Three creatine deficiency syndromes, including guanidinoacetate methyltransferase (GAMT) deficiency, were identified. These conditions cause severe developmental and speech impairments due to low brain creatine levels, necessitating early diagnosis and tailored treatments for better outcomes.

Area of Science:

  • Biochemistry
  • Genetics
  • Neurology

Background:

  • Three primary creatine deficiency syndromes (CDS) have been identified: guanidinoacetate methyltransferase (GAMT) deficiency, creatine transporter (CrT1) defect, and arginine:glycine amidinotransferase (AGAT) deficiency.
  • GAMT and AGAT deficiencies are autosomal-recessive, while the CrT1 defect is X-linked.
  • All CDS patients exhibit developmental delay/regression, intellectual disability, and significant speech disturbances.

Observation:

  • A universal characteristic of all CDS is severe depletion of creatine and phosphocreatine in the brain.
  • GAMT deficiency presents with elevated guanidinoacetic acid (GAA) in the brain and body, linked to seizures and movement disorders.
  • Proton magnetic resonance spectroscopy reveals a lack of the creatine/phosphocreatine signal in affected brains, serving as a diagnostic marker.

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Findings:

  • Oral creatine supplementation partially aids GAMT and AGAT deficiencies but is ineffective for the CrT1 defect.
  • Arginine restriction and ornithine substitution effectively reduce GAA levels and improve outcomes in GAMT deficiency.
  • AGAT deficiency shows decreased GAA and normal blood creatine, while CrT1 defect has normal GAA and elevated blood/urine creatine.

Implications:

  • Early diagnosis of CDS is crucial due to the potential for developmental impairments and unfavorable outcomes.
  • Understanding the distinct biochemical profiles (e.g., GAA levels) aids in differential diagnosis.
  • Optimizing treatment strategies, including creatine supplementation and dietary modifications, is essential for improving patient prognoses and understanding creatine's role in neurological function.