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ALG11-CDG syndrome: Expanding the phenotype.

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ALG11-Congenital Disorder of Glycosylation (ALG11-CDG) is an inherited metabolic disorder. This study expands the clinical and mutational spectrum of ALG11-CDG, detailing two new patients and a novel biomarker.

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Area of Science:

  • Biochemistry
  • Genetics
  • Metabolic Disorders

Background:

  • Congenital Disorders of Glycosylation (CDG) are a group of inherited metabolic diseases.
  • ALG11-CDG, or CDG-Ip, results from defects in the ALG11 gene, crucial for protein and lipid glycosylation.
  • Understanding the full clinical and molecular spectrum of ALG11-CDG is essential for diagnosis and management.

Observation:

  • Two unrelated patients with ALG11-CDG were identified, harboring novel ALG11 gene mutations.
  • Both patients exhibited severe psychomotor disabilities and epilepsy.
  • Fibroblast analysis revealed truncated precursor glycans and hypoglycosylation of the novel biomarker GP130.

Findings:

  • The study expands the known clinical phenotype of ALG11-CDG.
  • A novel biomarker, GP130, was found to be hypoglycosylated in affected individuals.
  • One patient presented with a normal transferrin glycosylation profile, a previously unreported finding in ALG11-CDG.

Implications:

  • These findings broaden the understanding of ALG11-CDG's genetic and clinical variability.
  • The identification of GP130 as a potential biomarker warrants further investigation.
  • The observation of normal transferrin glycosylation in one patient highlights the complexity and potential diagnostic challenges of ALG11-CDG.