| First Author | MacCarthy-Morrogh L | Year | 2000 |
| Journal | Oncogene | Volume | 19 |
| Issue | 48 | Pages | 5534-8 |
| PubMed ID | 11114731 | Mgi Jnum | J:65984 |
| Mgi Id | MGI:1927694 | Doi | 10.1038/sj.onc.1203949 |
| Citation | MacCarthy-Morrogh L, et al. (2000) Identification of a novel human BCL-X promoter and exon. Oncogene 19(48):5534-8 |
| abstractText | BCL-XL is a key anti-apoptotic BCL-2 family protein that is widely expressed in human cancer cells and is induced in response to diverse survival signals. The translation initiation codon for BCL-XL is located in BCL-X exon II and previous analyses have indicated that BCL-XL RNAs initiate close to the start of exon II or additionally contain a non-coding first exon (exon IA) spliced to exon II. Using 5' RACE we have now identified a novel BCL-X non-coding exon (exon IB) which is spliced directly to exon II in place of exon IA. Exon IB-containing RNAs encoded BCL-XL and were detected in non-malignant lymphocytes and lymphoma cells from lymph node biopsies and were expressed at significant levels in cell lines derived from ovarian, colon and breast cancers. We identified two TATA-box sequences upstream of exon IB and demonstrated that surrounding genomic sequences contained strong promoter activity in lymphoma cells (approximately 300-fold active relative to controls). We have therefore identified a powerful new BCL-X promoter and a novel exon that contributes to BCL-XL expression. |
