| First Author | Leung E | Year | 1998 |
| Journal | Biochem Biophys Res Commun | Volume | 243 |
| Issue | 1 | Pages | 317-25 |
| PubMed ID | 9473524 | Mgi Jnum | J:45664 |
| Mgi Id | MGI:1195819 | Doi | 10.1006/bbrc.1998.8092 |
| Citation | Leung E, et al. (1998) A novel extracellular domain variant of the human integrin alpha 7 subunit generated by alternative intron splicing. Biochem Biophys Res Commun 243(1):317-25 |
| abstractText | The integrin alpha 7 beta 1 laminin receptor, which is expressed on replicating myoblasts, and upregulated during myogenic differentiation, is involved in cell adhesion and communication between muscle cells and the extracellular matrix. It is a major cell-surface substrate in skeletal muscle cells for the cell-surface, argininespecific, ADP-ribosyltransferase. Both the extracellular and cytoplasmic domains of the mouse alpha 7 subunit undergo alternative splicing during development, generating differentially expressed variants with presumably unique ligand-binding and signalling properties. Here human cDNA clones isolated from a fetal heart lambda gt10 cDNA library encoded the complete sequence of the alpha 7 subunit and hybridised to a single major 4.4 kb alpha 7 subunit transcript abundantly expressed in human skeletal muscle, moderately expressed in heart, and weakly expressed in most other tissues. One clone out of four contained a novel 225-nucleotide in-frame deletion corresponding to 75 amino acids in the C-terminal region of the extracellular domain. The variant, whose expression appears to be tissue-specific, is created by alternative splicing at sites flanking an intron in the alpha 7 gene. A related mouse form was identified in P19 embryonal carcinoma cells. Deletion of the spliced region, which either contains or is in very close proximity to the major ADP-ribosylation site of the alpha 7 subunit, may serve to modulate the effects of ADP- ribosylation, or alternatively molecular associations, and receptor-ligand affinity. |
