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[Contiguous gene deletion syndrome in Xp21: an unusual form of presentation]

I Sanz-Ruiz1, J R Bretón-Martínez, C Del Castillo-Villaescusa

  • 1Servicio de Pediatría, Hospital Universitario Doctor Peset, Valencia, España.

Revista De Neurologia
|October 28, 2009
PubMed

Insights

This case study highlights contiguous gene deletion syndrome in Xp21, identified in an infant with Duchenne muscular dystrophy and pseudohypertriglyceridemia. Early diagnosis is crucial for managing associated metabolic complications.

Area of Science:

  • Genetics
  • Pediatrics
  • Endocrinology

Background:

  • Duchenne muscular dystrophy (DMD) is a severe genetic disorder.
  • Pseudohypertriglyceridemia can be a presenting symptom in infants.
  • Xp21 contiguous gene deletions are rare but serious genetic conditions.

Observation:

  • A 7-month-old infant presented with psychomotor retardation and axial hypotonia.
  • Elevated creatine phosphokinase (12,829 IU/L) and triglyceride levels were noted.
  • Genetic testing revealed a deletion in the dystrophin gene, consistent with DMD.

Findings:

  • Further investigations showed high glycerol levels, indicating glycerol kinase deficiency.
  • Genetic analysis confirmed a deletion in Xp21 encompassing genes for DMD, glycerol kinase deficiency, congenital adrenal hypoplasia (DAX1), and mental retardation (IL1RAPL1).

Implications:

  • Contiguous gene deletion syndrome in Xp21 should be considered in infants with myopathic compromise, elevated creatine phosphokinase, and pseudohypertriglyceridemia.
  • Early diagnosis is vital for preventing and treating metabolic complications, particularly those related to adrenal hypoplasia.
  • This case underscores the importance of comprehensive genetic evaluation in pediatric patients with complex symptoms.
Abstract

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