Genomic organization, promoter characterization and roles of Sp1 and AP-2 in the basal transcription of mouse PDIP1 gene.

The mouse polymerase delta-interacting protein 1 gene, PDIP1, is mapped to chromosome 7F3 region, spans approximately 16.7kb, and is organized into six exons. The transcription start site (TSS) was determined to be G, corresponding to position of 162-bp upstream of the translation start codon. The promoter region was found to lack TATA box or CCAAT box, instead, a CpG island was detected surrounding TSS. The region from -162 to +114 is required for basal transcriptional regulation of mouse PDIP1 gene, contains two AP-2 and two Sp1 binding sites. The Sp1 site upstream of TSS activates, while the other Sp1 site and two AP-2 sites suppress the transcription activity of mouse PDIP1 gene.

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