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Related Experiment Videos

Patterning of the mouse conduction system.

Stacey Rentschler1, Gregory E Morley, Glenn I Fishman

  • 1Mount Sinai School of Medicine, Box 1102, One Gustave L. Levy Place, New York, NY 10029-6754, USA.

Novartis Foundation Symposium
|September 6, 2003
PubMed
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Researchers identified a novel transgenic mouse model to study the cardiac conduction system (CCS). This model aids in understanding CCS development and specialization, crucial for coordinated heartbeats.

Area of Science:

  • Cardiovascular Biology
  • Developmental Biology
  • Genetics

Background:

  • The cardiac conduction system (CCS) is vital for coordinated heart excitation.
  • Murine CCS components, like Purkinje fibers, lack specific molecular markers, hindering identification.
  • Distinguishing CCS cells from cardiomyocytes is challenging due to morphological similarities.

Purpose of the Study:

  • To introduce a novel transgenic mouse model for studying the embryonic cardiac conduction system (CCS).
  • To delineate the complete CCS, including peripheral Purkinje fibers, throughout murine embryonic development.
  • To investigate the functional specialization of the CCS early in embryonic development.

Main Methods:

  • Generation of a transgenic mouse line with lacZ reporter gene expression in the embryonic CCS.

Related Experiment Videos

  • Utilizing lacZ expression to map the extent of the CCS from 8.25 days post-conception onwards.
  • Employing optical mapping of electrical activity in embryonic murine hearts to assess functional specialization.

    • Main Results:

    • The lacZ reporter accurately delineated the entire embryonic CCS, including the distal Purkinje fiber network, across developmental stages.
    • Functional specialization within the CCS was evident as early as 10.5 days post-conception.
    • The CCS-lacZ mice provide a valuable tool for identifying novel factors involved in CCS specialization.

    Conclusions:

    • A novel transgenic mouse model facilitates the comprehensive study of the cardiac conduction system.
    • Early functional specialization of the CCS is demonstrable in embryonic development.
    • This model serves as a platform for discovering molecular factors regulating CCS development and specialization.