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Combined deficiency of alpha and epsilon sarcoglycan disrupts the cardiac dystrophin complex

Alessio Lancioni1, Ida Luisa Rotundo, Yvonne Monique Kobayashi

  • 1Telethon Institute of Genetics and Medicine, Via Pietro Castellino 111, Napoli 80131, Italy.

Human Molecular Genetics
|September 6, 2011
PubMed

Insights

Epsilon-sarcoglycan (ε-SG) may prevent heart disease in patients with alpha-sarcoglycan (α-SG) deficiency. Mice lacking both α-SG and ε-SG developed severe cardiomyopathy, suggesting ε-SG

Area of Science:

  • Muscle biology
  • Genetics
  • Cardiology

Background:

  • Mutations in sarcoglycan (SG) genes cause skeletal muscle pathology.
  • Cardiomyopathy is a rare complication in patients with α-SG gene mutations.
  • Epsilon-sarcoglycan (ε-SG) is hypothesized to compensate for α-SG deficiency in the heart.

Purpose of the Study:

  • To investigate the function of ε-SG in striated muscle.
  • To determine if ε-SG compensates for α-SG deficiency in the heart.
  • To understand the role of ε-SG in preventing cardiomyopathy.

Main Methods:

  • Generated Sgce-null mice (lacking ε-SG).
  • Generated Sgca-;Sgce-null mice (lacking both α-SG and ε-SG).
  • Phenotypic analysis of generated mouse models.

Main Results:

  • Sgce-null mice exhibited a wild-type phenotype without muscular dystrophy or heart disease.
  • Sgca-;Sgce-null mice developed progressive muscular dystrophy and severe cardiomyopathy.
  • Sgca-;Sgce-null mice showed a complete loss of residual SGs and reduced dystrophin and dystroglycan.

Conclusions:

  • Epsilon-sarcoglycan (ε-SG) plays a crucial role in preventing cardiomyopathy associated with α-SG deficiency.
  • ε-SG is important for maintaining cardiac function in the context of α-SG loss.
  • This study highlights ε-SG as a potential therapeutic target for certain muscular dystrophies.

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