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- W1994592011 abstract "Tuberous sclerosis complex (TSC) is an autosomal dominant disorder with loci on chromosome 9q34.12 (TSC1) and chromosome 16p13.3 (TSC2). Genes for both loci have been isolated and characterized. The promoters of both genes have not been characterized so far and little is known about the regulation of these genes. This study reports the characterization of the human TSC1 promoter region for the first time. We have identified a novel alternative isoform in the 5' untranslated region (UTR) of the TSC1 gene transcript involving exon 1. Alternative isoforms in the 5'UTR of the mouse Tsc1 gene transcript involving exon 1 and exon 2 have also been identified. We have identified three upstream open reading frames (uORFs) in the 5'UTR of the TSC1/Tsc1 gene. A comparative study of the 5'UTR of TSC1/Tsc1 gene has revealed that there is a high degree of similarity not only in the sequence but also in the splicing pattern of both human and mouse TSC1 genes. We have used PCR methodology to isolate approximately 1.6 kb genomic DNA 5' to the TSC1 cDNA. This sequence has directed a high level of expression of luciferase activity in both HeLa and HepG2 cells. Successive 5' and 3' deletion analysis has suggested that a approximately 587 bp region, from position +77 to -510 from the transcription start site (TSS), contains the promoter activity. Interestingly, this region contains no consensus TATA box or CAAT box. However, a 521-bp fragment surrounding the TSS exhibits the characteristics of a CpG island which overlaps with the promoter region. The identification of the TSC1 promoter region will help in designing a suitable strategy to identify mutations in this region in patients who do not show any mutations in the coding regions. It will also help to study the regulation of the TSC1 gene and its role in tumorigenesis." @default.
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- W1994592011 date "2003-11-01" @default.
- W1994592011 modified "2023-09-25" @default.
- W1994592011 title "Identification of a core promoter and a novel isoform of the human TSC1 gene transcript and structural comparison with mouse homolog" @default.
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- W1994592011 doi "https://doi.org/10.1016/s0378-1119(03)00821-7" @default.
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