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- W1516308718 endingPage "308" @default.
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- W1516308718 abstract "Glutamine synthetase, the enzyme that catalyzes the ATP-dependent conversion of glutamate and ammonia into glutamine, is expressed in a tissue-specific and developmentally controlled manner. The first part of this review focuses on its spatiotemporal pattern of expression, the factors that regulate its levels under (patho)physiological conditions, and its role in glutamine, glutamate, and ammonia metabolism in mammals. Glutamine synthetase protein stability is more than 10-fold reduced by its product glutamine and by covalent modifications. During late fetal development, translational efficiency increases more than 10-fold. Glutamine synthetase mRNA stability is negatively affected by cAMP, whereas glucocorticoids, growth hormone, insulin (all positive), and cAMP (negative) regulate its rate of transcription. The signal transduction pathways by which these factors may regulate the expression of glutamine synthetase are briefly discussed. The second part of the review focuses on the evolution, structure, and transcriptional regulation of the glutamine synthetase gene in rat and chicken. Two enhancers (at -6.5 and -2.5 kb) were identified in the upstream region and two enhancers (between +156 and +857 bp) in the first intron of the rat glutamine synthetase gene. In addition, sequence analysis suggests a regulatory role for regions in the 3' untranslated region of the gene. The immediate-upstream region of the chicken glutamine synthetase gene is responsible for its cell-specific expression, whereas the glucocorticoid-induced developmental appearance in the neural retina is governed by its far-upstream region." @default.
- W1516308718 created "2016-06-24" @default.
- W1516308718 creator A5002005916 @default.
- W1516308718 creator A5014377544 @default.
- W1516308718 creator A5052827329 @default.
- W1516308718 creator A5085934045 @default.
- W1516308718 creator A5087560272 @default.
- W1516308718 date "1998-01-01" @default.
- W1516308718 modified "2023-10-05" @default.
- W1516308718 title "Regulation of the Spatiotemporal Pattern of Expression of the Glutamine Synthetase Gene" @default.
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