Related Experiment Video
Updated: May 18, 2026
06:27
Analysis of Cardiac Chamber Development During Mouse Embryogenesis Using Whole Mount Epifluorescence
Published on: April 17, 2019
A narrow developmental window defines PKN2's essential role in ventricular chamber morphogenesis
Julijus Bogomolovas1, Zengming Zhang1, Christa Trexler1
1Department of Medicine, UCSD, La Jolla, CA, USA.
Communications Biology
|May 16, 2026
Summary
Protein kinase N2 (PKN2) is crucial for early cardiomyocyte proliferation and heart development. Its absence during embryonic development leads to distinct heart shape defects, highlighting a critical window for its function in ventricular morphogenesis.
Area of Science:
- Cardiovascular Biology
- Developmental Biology
- Molecular Cardiology
Background:
- Protein kinase N2 (PKN2) is vital for embryonic development, but its specific role and timing in cardiomyocytes remain unclear.
- Previous studies indicate PKN2's importance in mesodermal and epithelial morphogenesis.
Purpose of the Study:
- To elucidate the precise temporal requirement of PKN2 in cardiomyocytes during heart development.
- To understand the molecular mechanisms underlying PKN2-dependent cardiac morphogenesis.
Main Methods:
- Constitutive and inducible cardiomyocyte-specific PKN2 knockout (cKO) mouse models.
- Quantitative light-sheet microscopy and morphometrics.
- Integrative multi-omics (RNA-seq, proteomics, phosphoproteomics) at embryonic day 10.5 (E10.5).
Main Results:
- PKN2 cKO resulted in postnatal lethality, systolic dysfunction, and a "coin-pouch" ventricular geometry.
- Molecular analysis at E10.5 revealed PKN2 cKO hearts showed induced actin cytoskeleton/motility programs and repressed mitosis modules.
- Reduced cardiomyocyte proliferation and altered ventricular shape trajectories were observed post-PKN2 loss.
- Inducible PKN2 knockout demonstrated a critical dependence window for PKN2 between E7.5 and E10.5 for normal ventricular morphogenesis.
Conclusions:
- Cardiomyocytes require PKN2 during an early proliferative phase for ventricular wall formation, involving cytoskeletal remodeling.
- PKN2 is dispensable for later gross ventricular chamber morphogenesis after this critical window.
- PKN2's function in coordinating cytoskeletal remodeling with tissue expansion is conserved across different organogenesis contexts.
Related Concept Videos
01:27Development 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...
As the embryo undergoes lateral folding, these paired tubes approach each other, merging into a single primitive heart tube by...
03:14Notch Signaling Pathway
The Notch signaling pathway is a major intracellular signaling pathway that is highly conserved over a broad spectrum of metazoan species. It stands unique from other intracellular signaling mechanisms in animals because notch protein itself acts as the receptor as well as the primary signaling molecule.
The Notch gene came into the limelight in 1914 after the discovery that its mutation in Drosophila melanogaster leads to a serrated (or "notched") wing margin phenotype. It was not until 1985...
The Notch gene came into the limelight in 1914 after the discovery that its mutation in Drosophila melanogaster leads to a serrated (or "notched") wing margin phenotype. It was not until 1985...