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Arsenic-induced alterations in embryonic transcription factor gene expression: implications for abnormal neural
B Wlodraczyk1, G D Bennett, J A Calvin
1Department of Veterinary Anatomy and Public Health, Texas A & M University, College Station 77843-4458, USA.
Developmental Genetics
|January 1, 1996
Summary
Arsenate exposure during pregnancy causes neural tube defects in embryos. This teratogen alters gene expression critical for neural tube closure and cell migration.
Area of Science:
- Developmental biology
- Toxicology
- Neuroscience
Background:
- Arsenate is a known teratogen.
- Neural tube defects (NTDs) are common birth defects with significant morbidity.
- Understanding molecular mechanisms underlying teratogen-induced NTDs is crucial for prevention.
Purpose of the Study:
- To investigate the morphological and molecular effects of arsenate exposure on embryonic development.
- To identify specific gene expression changes associated with arsenate-induced neural tube defects.
Main Methods:
- In utero exposure of embryos to varying concentrations of arsenate.
- Assessment of morphological abnormalities, specifically neural tube defects.
- Analysis of gene expression patterns using in situ transcription and antisense RNA amplification for transcription factors (creb, Hox 3.1, Pax3, Emx-1).
Main Results:
- Arsenate exposure caused a dose-dependent increase in neural tube defects.
- A significant delay in neural tube closure was observed on gestational day 9.0.
- Downregulation of Hox 3.1 and upregulation of Pax3, Emx-1, and creb gene expression were noted.
Conclusions:
- Arsenate exposure disrupts embryonic development, leading to neural tube defects.
- Altered expression of transcription factors like Hox 3.1 and Pax3 may contribute to impaired neural crest cell migration and closure.
- These findings highlight the molecular pathways affected by arsenate teratogenicity.