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. 1989 Apr;8(4):1079–1085. doi: 10.1002/j.1460-2075.1989.tb03476.x

Cell type specific trans-acting factors are involved in alternative splicing of human fibronectin pre-mRNA.

M V Barone 1, C Henchcliffe 1, F E Baralle 1, G Paolella 1
PMCID: PMC400917  PMID: 2545440

Abstract

ED-A and ED-B are facultative type III homologies of fibronectin, encoded by alternatively spliced exons, described in man and in rat. A hybrid alpha-globin-fibronectin minigene containing the ED-B region from the human gene has been transfected in human cell lines derived from various tissues, in order to study the processing of the generated precursor RNA in the different cell environments. In most tested lines the pre-RNA is alternatively spliced and produces two mature RNAs, with and without the ED-B exon, in different ratios that closely resemble the corresponding endogenous fibronectin RNAs. In a hepatoma cell line, Hep 3B, only one RNA is produced, in which the ED-B exon is absent; the same pattern of splicing is observed in liver. The data show that all the information required to produce accurate and regulated alternative splicing of the ED-B exon is contained in the fragment used and cell specific factors are necessary for the pre-RNA to be differentially spliced in the various cell lines. In contrast, expression in Hep 3B of a similar gene containing the ED-A area failed to reproduce the liver specific splicing pattern. Therefore regulation of ED-A processing is likely to involve different mechanisms to those responsible for control of ED-B splicing.

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