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Related Experiment Videos

Expression of the helix-loop-helix factor Id during mouse embryonic development

S M Evans1, T X O'Brien

  • 1Department of Medicine, UCSD School of Medicine.

Developmental Biology
|October 1, 1993
PubMed
Summary

The helix-loop-helix (HLH) protein Id is expressed in developing mouse embryos and neonatal hearts, particularly in cardiac cushions and valvular tissue. Its expression patterns suggest a role in regulating cardiac development and differentiation.

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Area of Science:

  • Developmental Biology
  • Molecular Biology
  • Genetics

Background:

  • The helix-loop-helix (HLH) protein Id family are known regulators of cell differentiation and proliferation.
  • Id proteins can inhibit the activity of basic HLH transcription factors, impacting gene expression.
  • Previous studies suggest Id's involvement in cardiac gene expression, hinting at a role in cardiac development.

Purpose of the Study:

  • To investigate the role of Id mRNA expression during cardiac development in mouse embryos.
  • To analyze the spatial and temporal expression patterns of Id mRNA in the developing heart and other embryonic tissues.
  • To correlate Id expression with the differentiation status of various cell populations.

Main Methods:

  • In situ hybridization analysis of Id mRNA.

Related Experiment Videos

  • Examination of developing mouse embryos from embryonic day 7 to 15.5.
  • Analysis of Id mRNA expression in neonatal mouse hearts.

    • Main Results:

    • Id mRNA was detected in proliferating mesenchymal and epithelial tissues, with expression decreasing during differentiation.
    • Id mRNA expression patterns overlapped with developmentally regulated genes like twist and hox 7/7.1.
    • High levels of Id mRNA were observed in developing cardiac cushions, outflow tract ridges, and neonatal valvular tissue.
    • Id mRNA was notably absent in early somite epithelial and myotomal compartments.

    Conclusions:

    • Id mRNA expression is dynamically regulated during embryonic development, correlating with cell proliferation and differentiation.
    • The expression patterns of Id in cardiac tissues suggest a significant role in heart development, particularly in the formation of cardiac cushions and valves.
    • Id is unlikely to inhibit early myogenic precursor differentiation in somites based on observed expression patterns.