title: The human thyroglobulin gene contains two 15-17 kb introns near its 3'-end.
abstract: We have cloned overlapping segments of the human thyroglobulin gene from a genomic cosmid library. Restriction mapping and electron microscopy show that a region of 38 kb at or near the 3'-end of this gene encodes only 850 nucleotides or 10% of the messenger RNA (mRNA) sequence. The region contains five exons of 130-210 nucleotides, split by introns of 1 to 15-17 kb. This represents the lowest ratio of coding to non-coding DNA (2.2%) found thus far in any eukaryotic gene. Blot hybridization under non-stringent conditions shows the presence of only one copy of this gene in the human genome and the absence of other closely related sequences.
mesh_terms: D001482:Base Composition; D001483:Base Sequence; D003001:Cloning, Molecular; D004262:DNA Restriction Enzymes; D005796:Genes; D005815:Genetic Code; D006801:Humans; D008854:Microscopy, Electron; D009690:Nucleic Acid Conformation; D010957:Plasmids; D012333:RNA, Messenger / Q000235:genetics; D013954:Thyroglobulin / Q000235:genetics*
chemical_list: D012333:RNA, Messenger; D013954:Thyroglobulin; D004262:DNA Restriction Enzymes