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The FASEB Journal, Vol 10, 961-968, Copyright © 1996 by The Federation of American Societies for Experimental Biology
REVIEWS |
GM Morriss-Kay and N Sokolova
Department of Human Anatomy, Oxford, United Kingdom.
During embryogenesis, information encoded in the genome is translated into cell proliferation, morphogenesis, and early stages of differentiation. Embryonic pattern arises from the spatial and temporal regulation and coordination of these events. The vitamin A (retinol) derivative retinoic acid (RA) is essential for normal development. Mammalian embryos are protected against vitamin A deficiency by maternal retinoid homeostasis until stored retinoids fall to very low levels. Retinol binding protein, which is synthesized in the yolk sac placenta of rodent embryos and in the syncytiotrophoblast of the human placenta, is essential for access of retinol to the embryo. Synthesis and metabolism of RA may involve cytoplasmic binding proteins, but the observation that mutants lacking these proteins are normal or near- normal suggests that they are not essential. Severe congenital vitamin A deficiency results in a spectrum of malformations including defects of the eye, lungs, cardiovascular system, and urogenital system. Extreme deficiency results as well in forelimb abnormalities and cleft face, but the embryos are not viable. Similar abnormalities are observed in embryos lacking two retinoid receptors, but loss of one receptor results in either normal development or mild abnormalities. Two single-receptor null mutants, RARgamma-/- and RXRalpha-/-, show regional pattern-specific resistance to teratogenic levels of RA. Mutations leading to abnormality of the structure or regulation of RA signaling pathway genes may be an important cause of human congenital abnormality.
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