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Dev Genet. 1996;18(4):306-15.

Arsenic-induced alterations in embryonic transcription factor gene expression: implications for abnormal neural development.

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Department of Veterinary Anatomy and Public Health, Texas A & M University, College Station 77843-4458, USA.


We examined the morphological and molecular consequences of acute in utero exposure to teratogenic concentrations of arsenate. The treatment produced a dose-related increase in neural tube defects, along with a significant alteration in the pattern of gene expression for several transcription factors (creb, Hox 3.1, Pax3, and Emx-1) that were examined using in situ transcription and antisense RNA amplification procedures. On gestational day 9:0, there was a significant delay in the embryos progression through neural tube closure, accompanied by a significant downregulation of Hox 3.1 expression and a significant upregulation of Pax3, Emx-1, and creb. As both Hox 3.1 and Pax3 serve to regulate N-CAM expression, it is possible that abnormalities associated with N-CAM may compromise neural crest cell migration and normal neural tube closure.

[Indexed for MEDLINE]

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