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Abstract
The 5′-upstream region (1.3 kb) of the gene encoding the POU domain transcription factor Oct-1 was cloned and sequenced. CAT reporter gene analysis of this region has detected a functionally active promoter. This region contains 24 TAAT-core sites, arranged in five clusters (four to six sites in one cluster); two octamer sites (ATGCAAAT) are located in the first and second clusters; in the second one the CCAAT-box adjacent to the octamer overlaps with the TAAT-core site. As shown by gel retardation assay, Oct-1, Oct-2, and some unknown proteins from myeloma cell line NS/0 interact with the TAAT-core sites of these clusters. The results suggest autoregulation of Oct-1 gene expression that may also be controlled by other POU proteins, homeodomain proteins and CCAAT trans-action factors.
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