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- W2003560925 abstract "The expression of retinoic acid-induced gene 1 (RIG1), a class II tumor suppressor gene, is induced in cells treated with retinoids. RIG1 has been shown to express ubiquitously and the increased expression of this gene appears to suppress cell proliferation. Recent studies also demonstrated that this gene may play an important role in cell differentiation and the progression of cancer. In spite of the remarkable regulatory role of this protein, the molecular mechanism of RIG1 expression induced by retinoids remains to be clarified. The present study was designed to study the molecular mechanism underlying the all-trans retinoic acid (atRA)-mediated induction of RIG1 gene expression. Polymerase chain reaction was used to generate a total of 10 luciferase constructs that contain various fragments of the RIG1 5′-genomic region. These constructs were then transfected into human gastric cancer SC-M1 and breast cancer T47D cells for transactivation analysis. atRA exhibited a significant induction in luciferase activity only through the −4910/−5509 fragment of the 5′-genomic region of RIG1 gene relative to the translation initiation site. Further analysis of this promoter fragment indicated that the primary atRA response region is located in between −5048 and −5403 of the RIG1 gene. Within this region, a direct repeat sequence with five nucleotide spacing, 5′-TGACCTctattTGCCCT-3′ (DR5, −5243/−5259), and an inverted repeat sequence with six nucleotide spacing, 5′-AGGCCAtggtaaTGGCCT-3′ (IR6, −5323/−5340), were identified. Deletion and mutation of the DR5, but not the IR6 element, abolished the atRA-mediated activity. Electrophoretic mobility shift assays with nuclear extract from atRA-treated cells indicated the binding of retinoic acid receptor (RAR) and retinoid X receptor (RXR) heterodimers specifically to this response element. In addition to the functional DR5, the region contains many other potential sequence elements that are required to maximize the atRA-mediated induction. Taken together, we have identified and characterized the functional atRA response element that is responsible for the atRA-mediated induction of RIG1 gene." @default.
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- W2003560925 date "2005-06-01" @default.
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- W2003560925 title "Identification and characterization of the retinoic acid response elements in the human RIG1 gene promoter" @default.
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- W2003560925 doi "https://doi.org/10.1016/j.bbrc.2005.03.214" @default.
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