Abstract
During the cloning of the bovine thyroglobulin cDNA, the restriction map of one of the recombinant plasmids was in disagreement with that of the full-length double-stranded thyroglobulin cDNA. When compared to the bovine Tg mRNA sequence, this cDNA clone exhibits a 333-nucleotide deletion which corresponds precisely to 2 exons of the Tg gene. It is thus likely that alternative processing of the premessenger RNA is at the origin of the deletion. The presence of giant introns in the vicinity of the dispensable exons may also reflect some error level in the splicing mechanism. Together with previous results the alternative splicing described in this study indicates that alternative processing of the Tg transcripts may be at the origin of thyroglobulin isoforms.
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