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Related Experiment Videos

Embryonic development and pattern formation

G M Morriss-Kay1, N Sokolova

  • 1Department of Human Anatomy, Oxford, United Kingdom.

FASEB Journal : Official Publication of the Federation of American Societies for Experimental Biology
|July 1, 1996
PubMed
Summary
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Nature reviews. Genetics·2001

Retinoic acid (RA), a vitamin A derivative, is crucial for embryonic development. Its deficiency or signaling pathway disruptions cause severe congenital malformations, highlighting RA

Area of Science:

  • Developmental Biology
  • Molecular Biology
  • Genetics

Background:

  • Embryonic development relies on precise spatial and temporal regulation of cell proliferation, morphogenesis, and differentiation.
  • Vitamin A (retinol) and its derivative retinoic acid (RA) are essential for normal mammalian embryonic development.
  • Maternal retinoid homeostasis protects embryos, but severe deficiency leads to congenital malformations.

Purpose of the Study:

  • To investigate the essential role of retinoic acid (RA) in embryonic development.
  • To understand the consequences of vitamin A deficiency and RA signaling pathway disruptions.
  • To identify potential causes of human congenital abnormalities related to RA signaling.

Main Methods:

  • Analysis of embryos with severe congenital vitamin A deficiency.

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  • Examination of mutant embryos lacking specific retinoid receptors (RARgamma-/- and RXRalpha-/-).
  • Assessment of the impact of RA signaling pathway gene mutations on development.

    • Main Results:

    • Severe vitamin A deficiency causes malformations in eyes, lungs, cardiovascular, and urogenital systems, as well as forelimb and facial defects.
    • Embryos lacking two retinoid receptors exhibit similar abnormalities, while single-receptor loss causes mild or no defects.
    • Specific receptor null mutants (RARgamma-/- and RXRalpha-/-) show resistance to RA teratogenicity.

    Conclusions:

    • Retinoic acid (RA) signaling is indispensable for normal embryonic development.
    • Disruptions in RA homeostasis or signaling pathways can lead to a spectrum of congenital malformations.
    • Mutations in RA signaling pathway genes are a potential cause of human congenital abnormalities.