Abstract
In a previous report, we described the presence, in pituitary tissue, of an alternatively processed species of bovine growth hormone mRNA from which the last intron (intron D) has not been removed by splicing (R. K. Hampson and F. M. Rottman, Proc. Natl. Acad. Sci. USA 84:2673-2677, 1987). Using transient expression of the bovine growth hormone gene in Cos I cells, we observed that splicing of intron D was affected by sequences within the downstream exon (exon 5). Deletion of a 115-base-pair FspI-PvuII restriction fragment in exon 5 beginning 73 base pairs downstream of the intron 4-exon 5 junction resulted in cytoplasmic bovine growth hormone mRNA, more than 95% of which retained intron D. This contrasted with less than 5% of the growth hormone mRNA retaining intron D observed with expression of the unaltered gene. Insertion of a 10-base-pair inverted repeat sequence, CTTCCGGAAG, which was located in the middle of this deleted segment, partially reversed this pattern, resulting in cytosolic mRNA from which intron D was predominantly removed. More detailed deletion analysis of this region indicated that multiple sequence elements within the exon 5, in addition to the 10-base-pair inverted repeat sequence, are capable of influencing splicing of intron D. The effect of these exon sequences on splicing of bovine growth hormone precursor mRNA appeared to be specific for the growth hormone intron D. Deletions in exon 5 which resulted in marked alterations in splicing of growth hormone intron D had no effect on splicing when exon 5 of bovine growth hormone was placed downstream of the heterologous bovine prolactin intron D. Deletions in exon 5 which resulted in marked alterations in splicing of growth hormone intron D had no effect on splicing when exon 5 of bovine growth hormone was placed downstream of the heterologous bovine prolactin intron D. The results of this study suggest a unique interaction between sequences located near the center of exon 5 and splicing of the adjacent intron D.
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