title: Isolation of a novel cDNA clone for human tyrosine hydroxylase: alternative RNA splicing produces four kinds of mRNA from a single gene.
abstract: Human tyrosine hydroxylase (TH) cDNA was isolated by molecular cloning. Lambda gt 11 cDNA library constructed from human pheochromocytoma was screened with a synthetic 23-mer oligonucleotide complementary to rat TH mRNA. We found a novel type of cDNA clone whose N-terminal sequence is similar to but clearly distinct from each of the three types (type 1, 2 and 3) of TH cDNA reported by Grima et al. [Nature (1987) 326, 707-711]. It contains both the 12-bp insert characteristic of type 2 cDNA and the 81-bp sequence of type 3. This novel cDNA clone was designated as type 4. Southern blot analysis of human genomic DNA indicated that TH is encoded by a single gene. This suggests that the four different forms of TH mRNA are produced by alternative RNA splicing from a single primary transcript.
mesh_terms: D000310:Adrenal Gland Neoplasms / Q000201:enzymology; D000595:Amino Acid Sequence; D001483:Base Sequence; D003001:Cloning, Molecular; D004247:DNA / Q000378:metabolism*; D004262:DNA Restriction Enzymes; D005796:Genes; D006801:Humans; D010673:Pheochromocytoma / Q000201:enzymology; D012326:RNA Splicing; D012333:RNA, Messenger / Q000235:genetics*; D014446:Tyrosine 3-Monooxygenase / Q000235:genetics*
chemical_list: D012333:RNA, Messenger; D004247:DNA; D014446:Tyrosine 3-Monooxygenase; D004262:DNA Restriction Enzymes