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Two children with "dropped head" syndrome due to lamin A/C mutations

Jeremy C Chemla1, Ronald J Kanter, Michael P Carboni

  • 1Department of Neurobiology, Duke University Medical Center, Durham, North Carolina, USA.

Muscle & Nerve
|October 2, 2010
PubMed

Insights

LMNA-related congenital muscular dystrophy (L-CMD) is a genetic disorder causing infantile myopathy due to lamin A/C gene mutations. Early molecular diagnosis is crucial for patient care and monitoring cardiac risks.

Area of Science:

  • Genetics
  • Molecular Biology
  • Neurology

Background:

  • LMNA-related congenital muscular dystrophy (L-CMD) is a severe inherited neuromuscular disorder.
  • It stems from mutations in the Lamin A/C (LMNA) gene, affecting muscle structure and function.
  • Early infantile-onset myopathy is a hallmark of this condition.

Observation:

  • This study details the genetic and clinical profiles of two unrelated patients diagnosed with L-CMD.
  • Patient 1 presented with a novel L35P mutation.
  • Patient 2 carried a previously identified R249W mutation.

Findings:

  • Genetic analysis confirmed pathogenic LMNA mutations in both L-CMD patients.
  • The clinical presentation highlighted the characteristic infantile-onset myopathy.
  • Both novel and previously reported mutations were associated with the L-CMD phenotype.

Implications:

  • Recognizing the distinct L-CMD phenotype is vital for accurate diagnosis.
  • Molecular diagnostic testing can prevent unnecessary medical interventions.
  • Prompt identification facilitates monitoring for potentially life-threatening cardiac arrhythmias associated with L-CMD.

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