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Sarcomere visualized via Troponin I, slow skeletal muscle

4/24/2018

 
Movie. Timelapse movie of sarcomeres in beating cells. Time-lapse movie of live hiPSC-derived cardiomyocytes expressing mEGFP-tagged troponin I. Cells were continuously imaged on a spinning-disk confocal microscope with a 100ms exposure time. Inset shows detail of sarcomeres in myofibrils. Scale bars, 5 µm and 10 µm for inset and larger field respectively. Movie plays in real time.
 
Observations
  • Troponin I, slow skeletal muscle labels the thin filament of sarcomeres (actin-based), the contractile apparatus in muscle cells, and regulates myosin-based contraction. Sarcomeres align end-to-end to form myofibrils, striated filaments that generate force when sarcomeres contract.
  • Troponin I is absent from Z-disks, which results in a striated appearance along a myofibril. The spacing of this striation shortens as the cardiomyocytes beat. Sometimes buckling of the myofibril can be seen during beating.

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  • About
    • What We Do
    • FAQs
    • Videos & Tutorials
    • Site Updates
    • < Forum >
    • < AllenInstitute.org >
  • Animated Cell
    • Educational Resources
    • Visual Guide to Human Cells
    • Visual Guide Tutorial
    • Research Projects >
      • Pathtrace rendering
  • Cells & Biology
    • Cell Catalog
    • About our Cells >
      • hiPS Cell Biology Overview
      • Cell Structure Observations
      • Cell Catalog QuickView
    • Genomics
    • Methods & SOPs >
      • Methods for Cells in the Lab
      • Cell Methods: Videos from the Lab
      • Methods for Microscopy
    • Research Projects >
      • hiPS Cells During Mitosis
      • Drug Perturbation Pilot
      • Differentiation Into Cardiomyocytes
      • Why Endogenous Tagging?
  • Data & Tools
    • Cell Catalog
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