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Humanized Dsp ACM Mouse Model Displays Stress-Induced Cardiac Electrical and Structural Phenotypes.

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Summary

Cardiovascular stress triggers arrhythmogenic cardiomyopathy (ACM) in a novel desmoplakin mouse model. This research highlights how genetic predisposition and external factors interact to cause heart disease.

Keywords:
arrhythmiaarrhythmogenic cardiomyopathycardiac stressdesmoplakinintercalated discmouse model

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Area of Science:

  • Cardiovascular Research
  • Genetics
  • Molecular Biology

Background:

  • Arrhythmogenic cardiomyopathy (ACM) is an inherited heart disorder linked to desmosomal gene variants.
  • Incomplete genetic penetrance in ACM complicates understanding disease triggers.
  • External stressors are suspected to influence ACM development, but their precise role remains unclear.

Purpose of the Study:

  • To investigate the combined effects of genetic variants and external stressors on ACM progression.
  • To develop and characterize a novel mouse model of ACM recapitulating a human desmoplakin variant.

Main Methods:

  • Created a mouse model with a humanized desmoplakin (Dsp) R451G variant.
  • Assessed cardiac function, structure, and electrophysiology under baseline and stress conditions (pressure overload, catecholaminergic challenge).
  • Analyzed desmoplakin (DSP) expression, connexin-43 localization, and cardiac histology.

Main Results:

  • Mice homozygous for the Dsp variant exhibited embryonic lethality.
  • Heterozygous Dsp mice showed no baseline phenotypes but developed heart failure with increased afterload.
  • Catecholaminergic challenge induced significant arrhythmias in Dsp mice.
  • Aberrant connexin-43 localization was observed, worsening with cardiac stress.

Conclusions:

  • Cardiovascular stress is a critical factor in unmasking electrical and structural phenotypes in this humanized ACM mouse model.
  • This model provides new insights into the interplay between genetics and environmental factors in ACM pathogenesis.
  • Targeting stress pathways may offer therapeutic strategies for ACM patients with specific genetic variants.