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Genetic variants in TTN (titin) are common in peripartum cardiomyopathy, similar to dilated cardiomyopathy. These titin variants are linked to reduced heart function in affected women.

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Area of Science:

  • Cardiology
  • Genetics
  • Molecular Biology

Background:

  • Peripartum cardiomyopathy (PPCM) shares clinical similarities with idiopathic dilated cardiomyopathy (DCM).
  • DCM is associated with mutations in over 40 genes, notably TTN, which encodes the sarcomere protein titin.
  • Understanding genetic predispositions in PPCM is crucial for diagnosis and treatment.

Purpose of the Study:

  • To investigate the prevalence and types of genetic variants in PPCM.
  • To compare the genetic landscape of PPCM with DCM and population controls.
  • To identify specific genes and variants associated with PPCM, particularly TTN.

Main Methods:

  • Sequencing of 43 genes associated with DCM in 172 women with PPCM.
  • Comparison of rare truncating variant prevalence in PPCM, DCM cohorts, and a large reference population.
  • Correlation analysis between TTN variants and cardiac function (ejection fraction) in a subset of PPCM patients.

Main Results:

  • 26 distinct rare truncating variants in 8 genes were identified in women with PPCM (15% prevalence).
  • TTN variants accounted for two-thirds of identified truncating variants in PPCM (10% prevalence), significantly higher than controls (1.4%).
  • TTN truncating variants were associated with lower ejection fraction at 1-year follow-up in PPCM patients.

Conclusions:

  • The genetic variant distribution in PPCM closely mirrors that of idiopathic DCM.
  • TTN truncating variants represent the most common genetic predisposition in both PPCM and DCM.
  • Genetic analysis of TTN may aid in understanding and managing PPCM.