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Related Concept Videos

Development of the Heart01:27

Development of the Heart

The development of the human heart, a crucial organ, commences from the mesoderm on the 18th or 19th day after fertilization. This process initiates in the cardiogenic area, a group of mesodermal cells at the embryo's head end, which evolves into elongated strands known as cardiogenic cords. These cords undergo a transformation to form hollow-centered endocardial tubes.
As the embryo undergoes lateral folding, these paired tubes approach each other, merging into a single primitive heart tube by...
Cardiomyopathy I: Introduction and Classification01:25

Cardiomyopathy I: Introduction and Classification

Cardiomyopathy, or CMP, is a group of diseases affecting the myocardial structure, impairing its ability to pump blood effectively. This condition can lead to arrhythmias, heart failure, or sudden cardiac death.Cardiomyopathies are classified into primary and secondary categories:Primary Cardiomyopathy refers to conditions involving only the heart muscle that are often idiopathic (of unknown cause) or genetic. They primarily affect the myocardium without the involvement of other systemic...
Cardiomyopathy II: Dilated Cardiomyopathy01:30

Cardiomyopathy II: Dilated Cardiomyopathy

Dilated cardiomyopathy, or DCM, is a progressive myocardial disorder characterized by ventricular chamber dilation and contractile dysfunction.EtiologyVarious factors can cause DCM, including hypertension and heavy alcohol intake, which contribute to the weakening and enlargement of the heart muscle. Viral infections, such as Coxsackievirus B, adenoviruses, and influenza, can lead to DCM by causing inflammation and damage to heart tissue. Certain chemotherapeutic agents, including daunorubicin,...
Cardiomyopathy III: Hypertrophic Cardiomyopathy01:29

Cardiomyopathy III: Hypertrophic Cardiomyopathy

Hypertrophic cardiomyopathy, or HCM, is an autosomal dominant genetic disorder characterized by asymmetric left ventricular hypertrophy without ventricular dilation. It is more common in men and is typically diagnosed in young, athletic adults.EtiologyHCM is primarily genetic and is caused by mutations in genes encoding sarcomeric proteins. Researchers have identified over 1400 mutations across at least 11 different genes. Among these, the most frequently occurring mutations are found in the...
Cardiomyopathy IV: Restrictive Cardiomyopathy01:29

Cardiomyopathy IV: Restrictive Cardiomyopathy

Restrictive cardiomyopathy (RCM) is a rare heart muscle disease characterized by impaired ventricular filling due to stiffened ventricular walls, leading to significant diastolic dysfunction.EtiologyRestrictive cardiomyopathy can arise from both inherited and acquired diseases, many of which are systemic. It is categorized into four main types: infiltrative, storage, non-infiltrative, and endomyocardial diseases.Infiltrative diseases, such as amyloidosis, lead to RCM by depositing amyloid...

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Related Experiment Video

Updated: Jun 23, 2026

Simultaneous Assessment of Cardiomyocyte DNA Synthesis and Ploidy: A Method to Assist Quantification of Cardiomyocyte Regeneration and Turnover
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Simultaneous Assessment of Cardiomyocyte DNA Synthesis and Ploidy: A Method to Assist Quantification of Cardiomyocyte Regeneration and Turnover

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The PIDDosome controls cardiomyocyte polyploidization during postnatal heart development.

M Leone1, N Kinz2, F Eichin2

  • 1Biocenter, Institute for Developmental Immunology, Medical University of Innsbruck, Innsbruck, Austria. macileo@hotmail.com.

Cell Death and Differentiation
|January 12, 2026
PubMed
Summary
This summary is machine-generated.

The PIDDosome complex restricts polyploidy in heart cells during development. Loss of PIDDosome function increases cell ploidy, potentially impacting cardiac function in aged mice.

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Area of Science:

  • Cardiology
  • Cell Biology
  • Developmental Biology

Background:

  • Adult mammalian cardiomyocytes (CMs) are post-mitotic and polyploid.
  • Understanding CM cell cycle exit and polyploidy is crucial for heart regeneration therapies.

Purpose of the Study:

  • To investigate the role of the PIDDosome complex in regulating cardiomyocyte (CM) polyploidy during postnatal heart development.
  • To determine the impact of PIDDosome-mediated polyploidy control on cardiac structure and function.

Main Methods:

  • DNA content analysis to assess cardiomyocyte ploidy.
  • Investigating PIDDosome activation mechanisms involving ANKRD26 and PIDD1.
  • Utilizing nuclear RNA sequencing and genetic deletion experiments.
  • Assessing cardiac structure and function in mice with altered PIDDosome activity.

Main Results:

  • Cell-autonomous PIDDosome loss leads to increased CM nuclear and cellular ploidy.
  • PIDDosome-imposed polyploidy control occurs between postnatal day 7 and P14.
  • PIDDosome activation requires ANKRD26 and targets PIDD1 to mother centrioles.
  • Increased ploidy due to PIDDosome loss affects cardiac function in aged mice.
  • PIDDosome limits CM polyploidization independently of p53 but requires p21/Cdkn1a induction.

Conclusions:

  • The PIDDosome complex plays a key role in implementing a CM-specific differentiation program that limits polyploidy during postnatal heart development.
  • PIDDosome-mediated control of CM polyploidy is essential for maintaining cardiac function, particularly in aging.
  • These findings offer new insights into restricting polyploid CM proliferation and have implications for heart regenerative therapies.