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Dysferlinopathies: Clinical and genetic variability.

Alisa Ivanova1, Svetlana Smirnikhina1, Alexander Lavrov1

  • 1Research Centre for Medical Genetics, Moscow, Russia.

Clinical Genetics
|August 27, 2022
PubMed
Summary

Dysferlinopathies, caused by DYSF gene mutations, affect muscle membrane integrity. This review explores their varied clinical features and genotype-phenotype links, noting missense mutations may cause more severe disease.

Keywords:
Miyoshi myopathydysferlindysferlinopathiesgenotype-phenotype correlationsgirdle-limb muscular dystrophy type 2B

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Area of Science:

  • Neurology
  • Genetics
  • Molecular Biology

Background:

  • Dysferlinopathies are a group of inherited muscle diseases stemming from mutations in the DYSF gene.
  • The dysferlin protein is crucial for muscle membrane repair and integrity, primarily functioning at the sarcolemma.
  • Known clinical subtypes include Miyoshi myopathy, limb-girdle muscular dystrophy type 2B, distal myopathy with anterior tibial onset, and isolated hyperCKemia.

Purpose of the Study:

  • To review the diverse clinical presentations of dysferlinopathies.
  • To investigate potential genotype-phenotype correlations in these rare genetic muscle disorders.
  • To discuss the impact of specific mutations and potential genetic modifiers on disease development.

Main Methods:

  • Literature review of clinical features associated with DYSF gene mutations.
  • Analysis of reported genotype-phenotype relationships in dysferlinopathy patients.
  • Discussion of mutation types (e.g., missense vs. loss-of-function) and their correlation with disease severity.

Main Results:

  • Dysferlinopathies exhibit significant clinical heterogeneity.
  • Establishing clear genotype-phenotype correlations is challenging due to disease rarity and variability.
  • Preliminary findings suggest missense mutations may lead to more severe phenotypes compared to loss-of-function mutations, a pattern seen in other muscular dystrophies.

Conclusions:

  • Understanding the relationship between DYSF mutations and clinical outcomes is critical for diagnosis and management.
  • Further research into specific mutations and genetic modifiers is needed to elucidate the mechanisms underlying phenotypic variability.
  • This review highlights the complexity of dysferlinopathies and the need for continued investigation into their genetic underpinnings.