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[Laminopathies: one gene, several diseases].

Anne T Bertrand1, Khadija Chikhaoui, Rabah Ben Yaou

  • 1UPMC Université Paris VI, IFR14, 75013 Paris, France. a.bertrand@institut-myologie.org

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Mutations in the LMNA gene cause laminopathies, a group of diseases affecting various tissues. Understanding genotype-phenotype correlations in these laminopathies is crucial for developing targeted therapies.

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Area of Science:

  • Cell Biology
  • Genetics
  • Biochemistry

Context:

  • Lamins A/C, encoded by the LMNA gene, are nuclear proteins essential for nuclear lamina structure and function.
  • LMNA mutations lead to over ten distinct disorders, termed laminopathies, affecting diverse tissues like muscle, adipose tissue, and nerves, as well as systemic conditions like premature aging syndromes.
  • The heterogeneity of LMNA mutations complicates genotype-phenotype relationship establishment.

Purpose:

  • To explore the genotype-phenotype correlations in LMNA-related laminopathies.
  • To elucidate the pathophysiological mechanisms underlying different laminopathies.
  • To highlight the utility of mouse models in studying LMNA mutations and potential treatments.

Summary:

  • LMNA mutations manifest in diverse phenotypes, including premature aging, adipose tissue disorders, and striated muscle myopathies.
  • Specific mutation types correlate with distinct disease manifestations, such as immature protein accumulation in aging syndromes or impaired SREBP-1 interaction in adipose tissue laminopathies.
  • Structural defects in nuclear lamina polymerization due to LMNA mutations contribute to cellular mechanical weakness, particularly in mechanically stressed tissues like striated muscle.

Impact:

  • Establishes critical genotype-phenotype correlations for LMNA mutations, aiding in disease diagnosis and prognosis.
  • Provides insights into the molecular mechanisms of laminopathies, paving the way for targeted therapeutic strategies.
  • Demonstrates the significant role of mouse models in advancing the understanding and treatment of laminopathies.