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ACTN2 mutations cause "Multiple structured Core Disease" (MsCD).

Xavière Lornage1,2,3,4, Norma B Romero5,6,7, Claire A Grosgogeat8

  • 1Institut de Génétique et de Biologie Moléculaire et Cellulaire (IGBMC), 1, rue Laurent Fries, BP 10142, 67404, Illkirch, France.

Acta Neuropathologica
|February 1, 2019
PubMed

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Summary
This summary is machine-generated.

New genetic mutations in ACTN2 cause a congenital myopathy, a skeletal muscle disorder. This discovery aids in diagnosing myopathies and identifying new therapeutic targets for muscle weakness.

Area of Science:

  • Genetics
  • Molecular Biology
  • Neurology

Background:

  • Identifying genes for myopathies is crucial for diagnosis and therapeutic development.
  • Congenital myopathies are a group of inherited muscle disorders affecting muscle structure and function.

Observation:

  • Two unrelated patients with early-onset muscle weakness and respiratory issues were found to have de novo ACTN2 mutations.
  • Muscle biopsies showed unique structural abnormalities, including small structured cores and jagged Z-lines.

Findings:

  • Exome sequencing identified a missense and a deletion mutation in the ACTN2 gene.
  • Modeling the mutations in zebrafish and mice replicated the patients' muscle dysfunction and structural defects.
  • Mutant alpha-actinin-2 expression led to sarcomeric disorganization, cores, and Z-line defects in murine models.
Keywords:
ACTN2Alpha-actinin-2Congenital myopathyCore myopathyNemaline myopathyZ-line

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Implications:

  • This study identifies ACTN2 mutations as a cause of skeletal myopathy, expanding the known spectrum of ACTN2-related disorders.
  • The findings highlight alpha-actinin-2 as a key regulator of skeletal muscle structure and function.
  • Understanding these mutations provides insights into myopathy pathogenesis and potential therapeutic strategies.