TATA box-independent transcription of the human tissue plasminogen activator gene initiates within a sequence conserved in related genes

• Published in: FEBS letters 1992-09, Vol.309 (2), p.130-134
• Main Authors: Henderson, Beric R, Sleigh, Merilyn J.
• Format: Article
• Language: English
• Subjects: Amino Acid Sequence; base pair; Biological and medical sciences; Blotting, Northern; CAT; cDNA; Cell Line; chloramphenicol acetyl transferase; complementary DNA; DME; Dulbecco's modified Eagle's medium; FCS; fetal calf serum; Fundamental and applied biological sciences. Psychology; GAPDH; Gene Expression Regulation - genetics; Genes. Genome; glyceraldehyde-3-phosphate dehydrogenase; Humans; Molecular and cellular biology; Molecular genetics; Molecular Sequence Data; mRNA; Multigene Family - genetics; phorbol-12-myristate-13-acetate; Plasmids - genetics; PMA; RNA, Messenger - genetics; TATA Box - genetics; TATA-box; Tissue plasminogen activator; Tissue Plasminogen Activator - genetics; tissue-type plasminogen activator; tPA; Transcription; Transcription, Genetic - genetics
• ISSN: 0014-5793; 1873-3468
• DOI: 10.1016/0014-5793(92)81080-6

Transcription of the human tissue-type plasminogen activator (tPA) gene has been reported to initiate from a single site proximal to a TATA box motif (1985, J. Biol. Chem. 260, 11223–11230). In this study, we utilized primer extension analysis to evaluate the tPA mRNA start site in phorbol-12-myristate 13-acetate (PMA) induced WI-38 man lung fibroblast cells. Whilst some tPA mRNA initiated from the predicted TATA-proximal location (+1), a 10-fold greater proportion of tPA mRNA transcripts initiated 110 bases downstream from a sequence conserved and utilized as the TATA-independent transcription start site in the rodent tPA genes. Moreover, the transfection and expression in different cell types of a cosmid containing the entire human tPA gene resulted in utilization of the same downstream (+110) start site. We propose that this, rather than the previously published position, is the major transcriptional initiation point for the human tPA gene. A core sequence (5′-CAGAGCTG-3′) was identified which is common to the TATA-independent mRNA start sites of the human, mouse and rat tPA genes, and which demonstrates only partial similarity to sequences found at the initiation point of other TATA-independent genes.