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• W2010045478 abstract "The aldolase C gene product is a glycolytic isoenzyme specifically detected in brain. We have previously defined a short 115-base pair promoter fragment able to confer on a reporter chloramphenicol acetyltransferase (CAT) gene a specific expression in brain of transgenic mice. In this promoter fragment, two GC-rich regions (A/A‘ and B boxes) were detected by in vitro DNase1 footprinting experiments with brain, fibroblast, or liver nuclear extracts. Both A/A‘ and B boxes, sharing structural homology, are able to interact with Sp1, Krox20/Krox24 factors and with other proteins (Thomas, M., Makeh, I., Briand, P., Kahn, A., and Skala, H.(1993) Eur. J. Biochem. 218, 143-151). In this paper, we describe a new ubiquitous factor termed Ub able to bind the A/A‘ box. We also delimit a third element (box C) binding a hepatocyte-enriched protein displaced by a hepatocyte nuclear factor 3-specific oligonucleotide. The functional involvement of each binding site in brain-specific transcription of the aldolase C gene has been tested in transgenic mice carrying different mutant promoters cloned in front of the CAT gene. A promoter containing only box C was totally inactive, suggesting an essential role of the region containing A/A‘ and B boxes. However, mutations or deletions of either the A/A‘ or the B box have no significant effect on the CAT gene expression. We therefore hypothesize that the A/A‘ and B sites may be functionally redundant. Indeed, constructs harboring only one of these two boxes (A/A‘ or B) linked to the C box displayed a brain-specific CAT activity similar to that obtained with the wild-type promoter. Furthermore, a transgene with disruption of the C box, keeping intact the A/A‘ and B boxes, was totally inactive, suggesting a crucial role of the hepatocyte nuclear factor 3 binding site in activation of the aldolase C gene. The aldolase C gene product is a glycolytic isoenzyme specifically detected in brain. We have previously defined a short 115-base pair promoter fragment able to confer on a reporter chloramphenicol acetyltransferase (CAT) gene a specific expression in brain of transgenic mice. In this promoter fragment, two GC-rich regions (A/A‘ and B boxes) were detected by in vitro DNase1 footprinting experiments with brain, fibroblast, or liver nuclear extracts. Both A/A‘ and B boxes, sharing structural homology, are able to interact with Sp1, Krox20/Krox24 factors and with other proteins (Thomas, M., Makeh, I., Briand, P., Kahn, A., and Skala, H.(1993) Eur. J. Biochem. 218, 143-151). In this paper, we describe a new ubiquitous factor termed Ub able to bind the A/A‘ box. We also delimit a third element (box C) binding a hepatocyte-enriched protein displaced by a hepatocyte nuclear factor 3-specific oligonucleotide. The functional involvement of each binding site in brain-specific transcription of the aldolase C gene has been tested in transgenic mice carrying different mutant promoters cloned in front of the CAT gene. A promoter containing only box C was totally inactive, suggesting an essential role of the region containing A/A‘ and B boxes. However, mutations or deletions of either the A/A‘ or the B box have no significant effect on the CAT gene expression. We therefore hypothesize that the A/A‘ and B sites may be functionally redundant. Indeed, constructs harboring only one of these two boxes (A/A‘ or B) linked to the C box displayed a brain-specific CAT activity similar to that obtained with the wild-type promoter. Furthermore, a transgene with disruption of the C box, keeping intact the A/A‘ and B boxes, was totally inactive, suggesting a crucial role of the hepatocyte nuclear factor 3 binding site in activation of the aldolase C gene." @default.
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• W2010045478 date "1995-09-01" @default.
• W2010045478 modified "2023-10-13" @default.
• W2010045478 title "Functional Dissection of the Brain-specific Rat Aldolase C Gene Promoter in Transgenic Mice" @default.
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• W2010045478 doi "https://doi.org/10.1074/jbc.270.35.20316" @default.
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