title: Obvious mRNA and protein expression but absence of mutations of the RET proto-oncogene in parathyroid tumors.
abstract: The study on the expression of the RET proto-oncogene in parathyroid tumors disclosed obvious mRNA expression by the reverse transcription (RT)-polymerase chain reaction (PCR) method and protein expression by Western blotting. To find out whether mutations in the cysteine-rich regions or tyrosine kinase domain of the RET proto-oncogene are etiological for parathyroid tumorigenesis, sporadic parathyroid adenomas and carcinomas, parathyroid tumors from multiple endocrine neoplasia 1, familial isolated hyperparathyroidism or hereditary hyperparathyroidism-jaw tumor syndrome were screened by PCR-single strand conformation polymorphism and PCR restriction fragment length polymorphism. Missense mutations in the cysteine-rich region, or codons 768 or 918 in the tyrosine kinase domain of the RET proto-oncogene, were not detected in any of the examined cases of parathyroid tumors. These results suggest that mutations of the RET proto-oncogene do not represent a frequent mechanism of tumorigenesis for parathyroid tumors.
authors.affiliation: First Department of Internal Medicine, School of Medicine, The University of Tokushima, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Kimura
authors.forename: K
authors.initials: K
authors.lastname: Yoshimoto
authors.forename: C
authors.initials: C
authors.lastname: Tanaka
authors.forename: T
authors.initials: T
authors.lastname: Ohkura
authors.forename: H
authors.initials: H
authors.lastname: Iwahana
authors.forename: A
authors.initials: A
authors.lastname: Miyauchi
authors.forename: T
authors.initials: T
authors.lastname: Sano
authors.forename: M
authors.initials: M
authors.lastname: Itakura
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001483:Base Sequence; D015153:Blotting, Western; D029721:Drosophila Proteins; D005260:Female; D015972:Gene Expression Regulation, Neoplastic; D005820:Genetic Testing; D006801:Humans; D008297:Male; D008875:Middle Aged; D015335:Molecular Probes / Q000235:genetics; D008969:Molecular Sequence Data; D009154:Mutation; D010282:Parathyroid Neoplasms / Q000235:genetics* / Q000378:metabolism*; D016133:Polymerase Chain Reaction; D000090063:Proto-Oncogene Mas; D011518:Proto-Oncogene Proteins / Q000235:genetics* / Q000378:metabolism*; D051096:Proto-Oncogene Proteins c-ret; D012333:RNA, Messenger / Q000378:metabolism*; D020794:Receptor Protein-Tyrosine Kinases / Q000235:genetics* / Q000378:metabolism*; D014158:Transcription, Genetic
chemical_list: D029721:Drosophila Proteins; C000715470:MAS1 protein, human; D015335:Molecular Probes; D000090063:Proto-Oncogene Mas; D011518:Proto-Oncogene Proteins; D012333:RNA, Messenger; D051096:Proto-Oncogene Proteins c-ret; D020794:Receptor Protein-Tyrosine Kinases; C416649:Ret protein, Drosophila