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Cardiac phenotype in familial partial lipodystrophy.

Abdelwahab Jalal Eldin1, Baris Akinci1,2, Andre Monteiro da Rocha3

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Summary

Familial partial lipodystrophy (FPLD) patients with LMNA variants face higher cardiac risks, particularly arrhythmias. Studying laminopathy in FPLD using patient-derived cells reveals disease mechanisms and informs monitoring strategies.

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Area of Science:

  • Cardiology
  • Genetics
  • Cell Biology

Background:

  • LMNA variants are linked to cardiac issues independently of lipodystrophy.
  • Familial partial lipodystrophy (FPLD) is a condition affecting fat distribution.
  • Understanding the cardiac impact of laminopathy in FPLD is crucial.

Purpose of the Study:

  • To assess the cardiac impact of FPLD.
  • To investigate the role of laminopathy in cardiac manifestations within FPLD patients.
  • To analyze the association between LMNA variants and cardiac events in FPLD.

Main Methods:

  • Retrospective cohort study of 122 FPLD patients.
  • Analysis of clinical data and cardiac events.
  • Proof-of-concept study using LMNA variant patient-derived cardiomyocytes (hiPSC-CMs).

Main Results:

  • Patients with LMNA variants showed a higher prevalence of cardiac events and significantly increased risk of arrhythmias, including atrial fibrillation/flutter.
  • Non-codon 482 LMNA variants were more strongly associated with cardiac events than codon 482 variants.
  • LMNA mutant hiPSC-CMs exhibited abnormal electrical activity, including spontaneous arrhythmias and altered responses to stimulation.

Conclusions:

  • Vigilant cardiac monitoring is essential for FPLD patients, especially those with LMNA variants.
  • LMNA variants significantly increase the risk of cardiac arrhythmias in FPLD.
  • hiPSC-CMs offer a valuable model for elucidating arrhythmia mechanisms in lipodystrophy patients with specific mutations.