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The Rowett Research Institute, Greenburn Road, Bucksburn, Aberdeen, AB21 9SB, Scotland
4To whom correspondence should be addressed.
Mammalian cells mount an active response to nutrient limitation by overexpressing the growth arrest specific (GAS) and the growth arrest and DNA damage (GADD) genes. During embryogenesis in rats, there are quantitative and temporal differences in GAS and GADD gene expression during the development of the placenta, heart and kidney. Genes associated with the inhibition of DNA synthesis (p53 and GAS1) were predominantly expressed during the early stages of development, whereas those genes associated with inhibition of protein synthesis [GADD153 (also known as CHOP-10 or Ddit3) and C/EBP-ß] were more highly expressed during the later stages. The GADD45 gene was expressed throughout development. There were distinct periods of GAS3 and GAS6 gene expression during the development of the placenta, heart and kidneys, which is consistent with the proposed roles of these genes in cell interactions. These results show that there is a change in the expression of genes associated with the negative regulation of growth as the fetus develops.
KEY WORDS: • rats • pregnancy • fetal growth • growth arrest • apoptosis
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