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The molecular genetics of retinoic acid receptors: cardiovascular and limb development
1Department of Cell and Neurobiology, University of Southern California School of Medicine, Los Angeles 90033, USA.
Abstract:
The vitamin A metabolite retinoic acid (RA) is utilized as a signalling molecule in wide variety of developmental processes, defined by defects which occur after nutritional vitamin A deficiency or after exposure to excess vitamin A. We have initiated a genetic analysis of RA function through the establishment of lines of mice which carry germline mutations in the genes which encode retinoid receptors. Defects which result from developmental RA deficiency or excess have been recovered in embryos which are deficient in various combinations of retinoid receptors. In this chapter, our current understanding of the role of RA and retinoid receptors in cardiovascular and limb development are described, as for these our level of understanding is most advanced.
Insights
Retinoic acid (RA) is vital for development. Genetic analysis of retinoid receptors in mice reveals defects in cardiovascular and limb development due to RA imbalances.
Area of Science:
- Developmental Biology
- Molecular Genetics
- Nutritional Science
Background:
- Retinoic acid (RA), a vitamin A metabolite, acts as a crucial signaling molecule in numerous developmental processes.
- Developmental abnormalities arise from both vitamin A deficiency and excess, highlighting RA's critical role.
- Understanding RA's function is key to addressing developmental defects.
Purpose of the Study:
- To genetically analyze the function of retinoic acid (RA) by studying mice with mutations in retinoid receptor genes.
- To identify developmental defects resulting from altered RA signaling during embryogenesis.
- To elucidate the roles of RA and its receptors in cardiovascular and limb development.
Main Methods:
- Generation of mouse lines with germline mutations in genes encoding retinoid receptors.
- Analysis of embryonic development in mice with deficiencies in various combinations of retinoid receptors.
- Phenotypic characterization of developmental defects related to RA signaling pathways.
Main Results:
- Specific combinations of retinoid receptor deficiencies lead to distinct developmental defects.
- Embryos lacking certain retinoid receptors exhibit abnormalities in cardiovascular and limb development.
- These findings confirm the essential roles of RA signaling in these complex developmental processes.
Conclusions:
- Retinoid receptors are essential for normal cardiovascular and limb development.
- Genetic disruptions in retinoid receptor function lead to identifiable developmental abnormalities.
- Further research into RA signaling pathways can inform strategies for preventing or treating developmental disorders.