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Nutr Rev. 2011 Oct;69(10):613-24. doi: 10.1111/j.1753-4887.2011.00425.x.

Vitamin A and clefting: putative biological mechanisms.

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1
Department of Orthodontics and Craniofacial Biology, Nijmegen Centre for Molecular Life Sciences, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands.

Abstract

Nutritional factors such as vitamin intake contribute to the etiology of cleft palate. Vitamin A is a regulator of embryonic development. Excess vitamin A can cause congenital malformations such as spina bifida and cleft palate. Therefore, preventive nutritional strategies are required. This review identifies putative biological mechanisms underlying the association between maternal vitamin A intake and cleft palate. Excessive vitamin A may disturb all three stages of palatogenesis: 1) during shelf outgrowth, it may decrease cell proliferation and thus prevent tissue development; 2) it may prevent shelf elevation by affecting extracellular matrix composition and hydration; and 3) during shelf fusion, it may affect epithelial differentiation and apoptosis, which precludes the formation of a continuous palate. In general, high doses of vitamin A affect palatogenesis through interference with cell proliferation and growth factors such as transforming growth factor β and platelet-derived growth factor. The effects of lower doses of vitamin A need to be investigated in greater depth in order to improve public health recommendations.

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