The adriamycin-induced rat model of the VATER association has provided a means of studying the morphogenesis of a variety of major congenital structural abnormalities similar to those seen in humans with the VATER association. Most interest has been centered on the foregut, where the model has clarified some aspects of the development of esophageal atresia (EA), tracheal agenesis, and other communicating bronchopulmonary foregut malformations. It has demonstrated aberrations in the nerve supply to the esophagus in EA and allowed the study of tracheomalacia. A relationship between an abnormal notochord, foregut abnormalities, and vertebral defects has been shown, and the model has reignited interest in the role of the notochord as a regional organizer of axial development. The normal temporospatial characteristics of apoptosis during fore- and hindgut development is disturbed in this model, resulting in abnormal morphology. The indications are that this model will continue to clarify the processes that lead to many of the structural congenital abnormalities that are seen in infants born with the VATER association.
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