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        The Developmental Vitamin D (DVD) Model of Schizophrenia

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        It is now widely acknowledged that exposure to adverse environmental factors in utero may not only affect how the brain develops but have long-lasting consequences for later brain function in the adult offspring. This idea has gained particular prominence amongst researchers interested in the etiology of neurodevelopmental disorders such as schizophrenia and autism. Approximately 10 years ago we proposed that developmental vitamin D (DVD) deficiency may explain several epidemiological features of this disease, most noticeably the winter/spring season of birth effect. In 2003 we published results from our first study indicating there were structural changes in how the brain develops in these offspring. Since then we have firmly established that DVD deficiency not only affects brain cell differentiation and gross anatomy but also produces alterations in behavior in these offspring as adults. In this chapter we describe how we came to construct the model we use today. Over the past 7 years the model has proved informative producing both structural brain changes (ventriculomegaly) and behavioral alterations (hyperlocomotion in response to NMDA antagonists) that are thought to be relevant to schizophrenia.
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