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Sequences involved in accurate and efficient transcription of human c-myc genes microinjected into frog oocytes.
Nishikura K
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By microinjecting a series of deletion mutant constructs into Xenopus laevis oocytes, transcriptional control regions, two promoters, of the human c-myc gene were defined. In the case of the first promoter, sequences between -60 and -37 relative to the transcription start site contained an element essential for promoter activity. In the case of the second promoter, sequences between -66 and -56 relative to the initiation site appeared to be involved in accurate and efficient transcription. In both cases, the region identified as the essential promoter element contained GGGCGG or GGCGGG,GC box-like sequences, suggesting that c-myc gene promoter activity may be controlled by transcription factor Sp1 binding in the microinjected oocytes.
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