Multiple K-ras codon 12 mutations in cholangiocarcinomas demonstrated with a sensitive polymerase chain reaction technique. 1991

S Levi, and A Urbano-Ispizua, and R Gill, and D M Thomas, and J Gilbertson, and C Foster, and C J Marshall
Section of Cell and Molecular Biology, Chester Beatty Laboratories, Institute of Cancer Research, London, United Kingdom.

By using a modified polymerase chain reaction strategy, we have devised an approach to detect a K-ras oncogene mutated at codon 12 in the presence of 1000 normal alleles. This is a considerable improvement in sensitivity on previous assays. Application of this assay to 15 cholangiocarcinomas showed that all contained a K-ras mutation to codon 12 and that nine of the tumors contained two or more mutations. In 11 cases, mutations were present in less than 10% of the cells in the sample. In common with pancreatic adenocarcinomas, in which 75 to 95% of cases contain a mutation in K-ras, cholangiocarcinomas show a very high frequency of ras gene mutation, but within a tumor only a fraction of cells contain a ras mutation. The presence of multiple mutations and the low frequency of mutant alleles in the samples argue against K-ras mutations being the initiating genetic lesion in this tumor, but suggest that ras gene mutation is involved in the stepwise progression of neoplastic cells to full malignancy.

UI MeSH Term Description Entries
D008969 Molecular Sequence Data Descriptions of specific amino acid, carbohydrate, or nucleotide sequences which have appeared in the published literature and/or are deposited in and maintained by databanks such as GENBANK, European Molecular Biology Laboratory (EMBL), National Biomedical Research Foundation (NBRF), or other sequence repositories. Sequence Data, Molecular,Molecular Sequencing Data,Data, Molecular Sequence,Data, Molecular Sequencing,Sequencing Data, Molecular
D009154 Mutation Any detectable and heritable change in the genetic material that causes a change in the GENOTYPE and which is transmitted to daughter cells and to succeeding generations. Mutations
D009841 Oligonucleotides Polymers made up of a few (2-20) nucleotides. In molecular genetics, they refer to a short sequence synthesized to match a region where a mutation is known to occur, and then used as a probe (OLIGONUCLEOTIDE PROBES). (Dorland, 28th ed) Oligonucleotide
D011125 Adenomatous Polyposis Coli A polyposis syndrome due to an autosomal dominant mutation of the APC genes (GENES, APC) on CHROMOSOME 5. The syndrome is characterized by the development of hundreds of ADENOMATOUS POLYPS in the COLON and RECTUM of affected individuals by early adulthood. Polyposis Coli, Familial,Polyposis Syndrome, Familial,Adenomatous Polyposis Coli, Familial,Adenomatous Polyposis of the Colon,Familial Adenomatous Polyposis,Familial Adenomatous Polyposis Coli,Familial Adenomatous Polyposis of the Colon,Familial Intestinal Polyposis,Familial Multiple Polyposi,Familial Multiple Polyposis,Familial Multiple Polyposis Syndrome,Familial Polyposis Coli,Familial Polyposis Syndrome,Familial Polyposis of the Colon,Hereditary Polyposis Coli,Myh-Associated Polyposis,Polyposis Coli,Polyposis, Adenomatous Intestinal,Adenomatous Intestinal Polyposes,Adenomatous Intestinal Polyposis,Adenomatous Polyposes, Familial,Adenomatous Polyposis Colus,Adenomatous Polyposis, Familial,Coli, Adenomatous Polyposis,Coli, Familial Polyposis,Coli, Hereditary Polyposis,Coli, Polyposis,Colus, Adenomatous Polyposis,Colus, Familial Polyposis,Colus, Hereditary Polyposis,Colus, Polyposis,Familial Adenomatous Polyposes,Familial Intestinal Polyposes,Familial Multiple Polyposes,Familial Multiple Polyposus,Familial Polyposis Colus,Familial Polyposis Syndromes,Hereditary Polyposis Colus,Intestinal Polyposes, Familial,Intestinal Polyposis, Adenomatous,Intestinal Polyposis, Familial,Multiple Polyposes, Familial,Multiple Polyposi, Familial,Multiple Polyposis, Familial,Multiple Polyposus, Familial,Myh Associated Polyposis,Myh-Associated Polyposes,Polyposes, Familial Adenomatous,Polyposes, Familial Multiple,Polyposes, Myh-Associated,Polyposi, Familial Multiple,Polyposis Coli, Adenomatous,Polyposis Coli, Hereditary,Polyposis Colus,Polyposis Colus, Adenomatous,Polyposis Colus, Familial,Polyposis Colus, Hereditary,Polyposis, Familial Adenomatous,Polyposis, Familial Multiple,Polyposis, Myh-Associated,Polyposus, Familial Multiple
D011905 Genes, ras Family of retrovirus-associated DNA sequences (ras) originally isolated from Harvey (H-ras, Ha-ras, rasH) and Kirsten (K-ras, Ki-ras, rasK) murine sarcoma viruses. Ras genes are widely conserved among animal species and sequences corresponding to both H-ras and K-ras genes have been detected in human, avian, murine, and non-vertebrate genomes. The closely related N-ras gene has been detected in human neuroblastoma and sarcoma cell lines. All genes of the family have a similar exon-intron structure and each encodes a p21 protein. Ha-ras Genes,Ki-ras Genes,N-ras Genes,c-Ha-ras Genes,c-Ki-ras Genes,c-N-ras Genes,ras Genes,v-Ha-ras Genes,v-Ki-ras Genes,H-ras Genes,H-ras Oncogenes,Ha-ras Oncogenes,K-ras Genes,K-ras Oncogenes,Ki-ras Oncogenes,N-ras Oncogenes,c-H-ras Genes,c-H-ras Proto-Oncogenes,c-Ha-ras Proto-Oncogenes,c-K-ras Genes,c-K-ras Proto-Oncogenes,c-Ki-ras Proto-Oncogenes,c-N-ras Proto-Oncogenes,ras Oncogene,v-H-ras Genes,v-H-ras Oncogenes,v-Ha-ras Oncogenes,v-K-ras Genes,v-K-ras Oncogenes,v-Ki-ras Oncogenes,Gene, Ha-ras,Gene, Ki-ras,Gene, v-Ha-ras,Gene, v-Ki-ras,Genes, Ha-ras,Genes, Ki-ras,Genes, N-ras,Genes, v-Ha-ras,Genes, v-Ki-ras,H ras Genes,H ras Oncogenes,H-ras Gene,H-ras Oncogene,Ha ras Genes,Ha ras Oncogenes,Ha-ras Gene,Ha-ras Oncogene,K ras Genes,K ras Oncogenes,K-ras Gene,K-ras Oncogene,Ki ras Genes,Ki ras Oncogenes,Ki-ras Gene,Ki-ras Oncogene,N ras Genes,N ras Oncogenes,N-ras Gene,N-ras Oncogene,c H ras Genes,c H ras Proto Oncogenes,c Ha ras Genes,c Ha ras Proto Oncogenes,c K ras Genes,c K ras Proto Oncogenes,c Ki ras Genes,c Ki ras Proto Oncogenes,c N ras Genes,c N ras Proto Oncogenes,c-H-ras Gene,c-H-ras Proto-Oncogene,c-Ha-ras Gene,c-Ha-ras Proto-Oncogene,c-K-ras Gene,c-K-ras Proto-Oncogene,c-Ki-ras Gene,c-Ki-ras Proto-Oncogene,c-N-ras Gene,c-N-ras Proto-Oncogene,ras Gene,ras Oncogenes,v H ras Genes,v H ras Oncogenes,v Ha ras Genes,v Ha ras Oncogenes,v K ras Genes,v K ras Oncogenes,v Ki ras Genes,v Ki ras Oncogenes,v-H-ras Gene,v-H-ras Oncogene,v-Ha-ras Gene,v-Ha-ras Oncogene,v-K-ras Gene,v-K-ras Oncogene,v-Ki-ras Gene,v-Ki-ras Oncogene
D012150 Polymorphism, Restriction Fragment Length Variation occurring within a species in the presence or length of DNA fragment generated by a specific endonuclease at a specific site in the genome. Such variations are generated by mutations that create or abolish recognition sites for these enzymes or change the length of the fragment. RFLP,Restriction Fragment Length Polymorphism,RFLPs,Restriction Fragment Length Polymorphisms
D002759 Adenoma, Bile Duct A benign tumor of the intrahepatic bile ducts. Cholangioma,Adenomas, Bile Duct,Bile Duct Adenoma,Bile Duct Adenomas,Cholangiomas
D003062 Codon A set of three nucleotides in a protein coding sequence that specifies individual amino acids or a termination signal (CODON, TERMINATOR). Most codons are universal, but some organisms do not produce the transfer RNAs (RNA, TRANSFER) complementary to all codons. These codons are referred to as unassigned codons (CODONS, NONSENSE). Codon, Sense,Sense Codon,Codons,Codons, Sense,Sense Codons
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D001483 Base Sequence The sequence of PURINES and PYRIMIDINES in nucleic acids and polynucleotides. It is also called nucleotide sequence. DNA Sequence,Nucleotide Sequence,RNA Sequence,DNA Sequences,Base Sequences,Nucleotide Sequences,RNA Sequences,Sequence, Base,Sequence, DNA,Sequence, Nucleotide,Sequence, RNA,Sequences, Base,Sequences, DNA,Sequences, Nucleotide,Sequences, RNA

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