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Related Experiment Video

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Atypical phenotype in two patients with LAMA2 mutations.

Joana Marques1, Sofia T Duarte2, Sónia Costa3

  • 1Serviço de Neurologia, Instituto Português de Oncologia de Lisboa, Francisco Gentil, Rua Professor Lima Basto, 1099-023 Lisboa, Portugal.

Neuromuscular Disorders : NMD
|February 19, 2014
PubMed
Summary

Mutations in the LAMA2 gene cause congenital muscular dystrophy type 1A. This study details two patients with partial laminin-α2 deficiency and unique symptoms, highlighting LAMA2 gene variants and diagnostic challenges.

Keywords:
CardiomyopathyCongenital muscular dystrophy 1AEpilepsyLaminin α2-chainMerosin

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Area of Science:

  • Genetics
  • Neurology
  • Cardiology

Background:

  • Congenital muscular dystrophy type 1A (MDC1A) is primarily caused by mutations in the LAMA2 gene, encoding laminin subunit alpha-2.
  • Laminin-α2 is crucial for muscle basement membrane integrity and neuromuscular junction stability.

Observation:

  • Two patients presented with partial laminin-α2 deficiency and atypical phenotypes.
  • Patient 1 exhibited predominantly central nervous system involvement (cognitive impairment, epilepsy) with normal muscle function.
  • Patient 2 displayed significant cardiac dysfunction, rigid spine syndrome, and limb-girdle weakness.

Findings:

  • Both patients carried heterozygous LAMA2 variants, including a shared missense mutation (c.2461A>C; p.Thr821Pro) in exon 18.
  • Brain MRI proved essential for diagnosis, especially in Patient 1 with initially normal motor skills.
  • Phenotypic variability may stem from the distinct combinations of LAMA2 mutations (two missense vs. one missense and one truncating).

Implications:

  • This expands the known phenotypic spectrum of LAMA2-related muscular dystrophies.
  • Highlights the importance of comprehensive genetic and imaging evaluations for diagnosing atypical presentations.
  • Suggests that specific LAMA2 variant combinations influence disease manifestation and severity.