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• W1908800320 endingPage "352" @default.
• W1908800320 startingPage "341" @default.
• W1908800320 abstract "The transcriptional enhancer of a chicken U1 small nuclear RNA gene has been shown to extend over approximately 50 base pairs of DNA sequence located 180 to 230 base pairs upstream of the U1 transcription initiation site. It is composed of multiple functional motifs, including a GC box, an octamer motif, and a novel SPH motif. The contributions of these three distinct sequence motifs to enhancer function were studied with an oocyte expression assay. Under noncompetitive conditions in oocytes, the SPH motif is capable of stimulating U1 RNA transcription in the absence of the other functional motifs, whereas the octamer motif by itself lacks this ability. However, to form a transcription complex that is stable to challenge by a second competing small nuclear RNA transcription unit, both the octamer and SPH motifs are required. The GC box, although required for full enhancer activity, is not essential for stable complex formation in oocytes. Site-directed mutagenesis was used to study the DNA sequence requirements of the SPH motif. Functional activity of the SPH motif is spread throughout a 24-base-pair region 3' of the octamer but is particularly dependent upon sequences near an SphI restriction site located at the center of the SPH motif. Using embryonic chicken tissue as a source material, we identified and partially purified a factor, termed SBF, that binds sequence specifically to the SPH motif of the U1 enhancer. The ability of this factor to recognize and bind to mutant enhancer DNA fragments in vitro correlates with the functional activity of the corresponding enhancer sequences in vivo." @default.
• W1908800320 created "2016-06-24" @default.
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• W1908800320 date "1990-01-01" @default.
• W1908800320 modified "2023-09-27" @default.
• W1908800320 title "Octamer and SPH motifs in the U1 enhancer cooperate to activate U1 RNA gene expression." @default.
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• W1908800320 doi "https://doi.org/10.1128/mcb.10.1.341" @default.
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• W1908800320 hasPublicationYear "1990" @default.
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