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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Omori, S. A. Wall, R. Malone, C. S. |
| Description | Author Affiliation: Malone CS ( Molecular Biology Institute and Department of Microbiology and Immunology, University of California, Los Angeles, School of Medicine, Los Angeles, CA 90095, USA.); |
| Abstract | The murine B29 (Igbeta) promoter is B cell specific and contains essential SP1, ETS, OCT, and Ikaros motifs. Flanking 5' DNA sequences inhibit B29 promoter activity, suggesting this region contains silencer elements. Two adjacent 5' DNA segments repress transcription by the murine B29 promoter in a position- and orientation-independent manner, analogous to known silencers. Both these 5' segments also inhibit transcription by several heterologous promoters in B cells, including mb-1, c-fos, and human B29. These 5' segments also inhibit transcription by the c-fos promoter in T cells suggesting they are not B cell-specific elements. DNase I footprint analyses show an approximately 70-bp protected region overlapping the boundary between the two negative regulatory DNA segments and corresponding to binding sites for at least two different DNA-binding proteins. Within this footprint, two unrelated 30-bp cis-acting DNA motifs (designated TOAD and FROG) function as position- and orientation-independent silencers when located directly 5' of the murine B29 promoter. These two silencer motifs act cooperatively to restrict the transcriptional activity of the B29 promoter. Neither of these motifs resembles any known silencers. Mutagenesis of the TOAD and FROG motifs in their respective 5' DNA segments eliminates the silencing activity of these upstream regions, indicating these two motifs as the principal B29 silencer elements within these regions. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 23 |
| Volume Number | 94 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 1997-12-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Antigens, CD Genetics B-Lymphocytes Immunology Promoter Regions, Genetic Animals Antigens, CD79 Cell Line Genes, Immunoglobulin Mice Molecular Sequence Data Mutagenesis, Site-Directed T-Lymphocytes Transcription, Genetic Transfection Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, P.H.S. Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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