Cloning of the cyclin A1 genomic structure and characterization of the promoter region - GC boxes are essential for cell cycle-regulated transcription of the cyclin A1 gene

Cyclin A1 is a recently cloned cyclin with high level expression in meiotic cells in the testis, However, it is also frequently expressed at high leve ls in acute myeloid leukemia. To elucidate the regulation of cyclin A1 gene expression, we cloned and analyzed the genomic structure of cyclin. A1. It consists of 9 exons within 13 kilobase pairs. The TATA-less promoter initi ates transcription from several start sites with the majority of transcript s beginning within a 4-base pair stretch. A construct containing a fragment from -190 to +145 showed the highest transcriptional activity. Transfectio n of cyclin A1 promoter constructs into S2 Drosophila cells demonstrated th at Sp1 is essential for the activity of the promoter. Sp1, as well as Sp3, bound to four GC boxes between nucleotides -130 and -80 as observed by gel shift analysis. Mutations in two or more of the four GC boxes decreased pro moter activity by >80%. The promoter was found to be cell cycle-regulated w ith highest activities found in late S and G(2)/M phase. Further analyses s uggested that cell cycle regulation was accomplished by periodic repression of the GC boxes in G(1) phase. Taken together, our data show that cyclin A 1 promoter activity critically depends on four GC boxes, and members of the Sp1 family appear to be involved in directing expression of cyclin A1 in b oth a tissue- and cell cycle-specific manner.