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A Reverse Genetic Approach to Test Functional Redundancy During Embryogenesis
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Redundant and dosage sensitive requirements for Fgf3 and Fgf10 in cardiovascular development

Lisa D Urness1, Steven B Bleyl, Tracy J Wright

  • 1Department of Human Genetics, University of Utah, Salt Lake City, UT 84112, USA.

Developmental Biology
|June 14, 2011
PubMed

Insights

Fibroblast growth factors (FGF3) and (FGF10) are crucial for coordinated heart development in mice. Their redundant roles are essential for cardiovascular progenitor development and preventing congenital heart defects.

Area of Science:

  • Developmental Biology
  • Genetics
  • Cardiovascular Research

Background:

  • Heart development involves complex interactions between multiple cell populations, including mesoderm and neural crest.
  • Fibroblast growth factors (FGFs) play dynamic roles in embryonic development.
  • Specific FGFs, like FGF3 and FGF10, are expressed in cardiovascular progenitor regions.

Purpose of the Study:

  • To investigate the roles of FGF3 and FGF10 in early murine cardiovascular development.
  • To determine if FGF3 and FGF10 have redundant or distinct functions.
  • To assess the impact of FGF3 and FGF10 mutations on heart formation.

Main Methods:

  • Generation of Fgf3 and Fgf10 mutant mouse models with varying allelic combinations.
  • Morphological analysis of embryonic cardiovascular structures.
  • Assessment of molecular markers in progenitor cell populations.

Main Results:

  • Fgf3 and Fgf10 exhibit redundant and dosage-sensitive requirements in heart development.
  • Mutant embryos displayed an allelic series of defects, with double mutants dying by embryonic day 11.5.
  • Multiple cardiovascular defects were observed, including outflow tract abnormalities, septal defects, and issues with great arteries.
  • Progenitor populations showed abnormalities, indicating a role in developmental coordination rather than initial specification.
  • FGF3 and FGF10 are essential for the coordinated development of cardiovascular progenitors.

Conclusions:

  • FGF3 and FGF10 are critical for the coordinated development of multiple cardiovascular progenitor populations.
  • Mutations in FGF3 or FGF10 may contribute to human congenital heart defects.
  • These findings highlight the importance of FGF signaling in ensuring proper heart formation.

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