| First Author | Sunyer T | Year | 1993 |
| Journal | J Neurosci Res | Volume | 36 |
| Issue | 2 | Pages | 224-34 |
| PubMed ID | 8263973 | Mgi Jnum | J:14842 |
| Mgi Id | MGI:63002 | Doi | 10.1002/jnr.490360213 |
| Citation | Sunyer T, et al. (1993) Cell type- and differentiation-dependent expression from the mouse acetylcholine receptor epsilon-subunit promoter. J Neurosci Res 36(2):224-34 |
| abstractText | The nicotinic acetylcholine receptor (AChR) in adult skeletal muscle is composed of alpha-, beta-, epsilon-, and delta-subunits and is localized at the neuromuscular junction; in contrast, the more diffusely distributed fetal form is composed of alpha-, beta-, gamma-, and delta-subunits. To define sequences necessary for the transcriptional regulation of the mouse epsilon-subunit gene, we sequenced and analyzed 1036 bp upstream of the transcription start site. Using deletion analysis of the 5'-flanking region linked to the bacterial chloramphenicol acetyltransferase (CAT) gene and transfection of the resulting constructs into established cell lines, we demonstrate that a 151 bp fragment exhibits cell type- and differentiation-specific promoter activity. This activity was independent of a myogenic factor putative binding site (E-box). However, transactivation experiments with recombinant myoD, myogenin, or MRF4 showed that the E-box was functional and that MRF4 preferentially transactivates the epsilon-promoter. Thus, like other AChR promoters, the proximal region of the epsilon-promoter contains information for cell type-specific and developmental regulation of CAT and can be transactivated by myogenic factors in cultured cell lines. Unlike the other AChR promoters characterized to date, epsilon-promoter function can be partially independent of myogenic factors of the helix-loop-helix class. |
