Summary
Over 50% of human conceptions are lost spontaneously. The rate of malformations in the embryo is about 10% and in the newborn, 2–3%. About 70% of malformations are of unknown etiology; about 20% are inherited as Mendelian traits or are associated with chromosomal aneuploidy; about 10% are due to specific agents (chemicals, drugs or viruses).
There are a number of principles of teratology which help in the management of clinical and public health problems. The teratogenic susceptibility of experimental animals and humans is controlled in part by the stage of development at which the developing embryo or fetus is exposed to the agent. Examples in humans include Coumadin and androgennmasculinizing syndromes. Species variation exists in the response to teratogens and some controlling factors will be discussed. The dosage of the teratogen is related to the damage produced; in fact, almost any agent in high enough dose can be shown to be teratogenic in experimental animals, even sodium chloride and sucrose.
There are problems in the interpretation of epidemiologic studies in humans, as is illustrated by the example of birth control pills and caffeine.
Supported in part by the National Institute of Child Health and Human Development (HD00836).
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Shepard, T.H. (1984). Teratogenesis. In: Chu, E.H.Y., Generoso, W.M. (eds) Mutation, Cancer, and Malformation. Environmental Science Research, vol 31. Springer, Boston, MA. https://doi.org/10.1007/978-1-4613-2399-0_24
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