Abstract:
:Primary chicken mesenchymal cells from limb buds and vertebral chondrocytes have been used to study the changes that occur in alternative mRNA splicing of fibronectin exon EIIIA during chondrogenesis. The mesenchymal cell phenotype (exon EIIIA included) and chondrocyte phenotype (exon EIIIA excluded) were preserved in culture. Both primary cell types were transfected with an EIIIA minigene and alternative splicing was monitored by S1 protection assay. Differential cell-specific splicing of the reporter was observed. The roles of two regulatory elements, an exon splicing enhancer (ESE) and an exon splicing silencer (ESS) were examined. Both elements were required for EIIIA inclusion into mRNA in mesenchymal cells. Gel mobility shift assays revealed that both chondrocyte- and mesenchymal cell-derived nuclear extracts contained exon EIIIA binding factors, but the RNA binding factors present in the two cell types appeared to be distinct. The ESE and ESS appeared to cooperate in the formation of both cell type-specific complexes. These results suggest a model in which inhibitory factors enriched in chondrocytes compete with positive factors enriched in mesenchymal cells for binding to exon EIIIA, determining whether the exon is included.
journal_name
J Cell Biochemjournal_title
Journal of cellular biochemistryauthors
Uporova TM,Norton PA,Tuan RS,Bennett VDdoi
10.1002/(sici)1097-4644(20000201)76:2<341::aid-jcbsubject
Has Abstractpub_date
1999-12-01 00:00:00pages
341-51issue
2eissn
0730-2312issn
1097-4644pii
10.1002/(SICI)1097-4644(20000201)76:2<341::AID-JCBjournal_volume
76pub_type
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