RGD Reference Report - Frequent somatic mutations of the APC and p53 genes in sporadic ampullary carcinomas. - Rat Genome Database

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Frequent somatic mutations of the APC and p53 genes in sporadic ampullary carcinomas.

Authors: Imai, Y  Oda, H  Tsurutani, N  Nakatsuru, Y  Inoue, T  Ishikawa, T 
Citation: Imai Y, etal., Jpn J Cancer Res. 1997 Sep;88(9):846-54.
RGD ID: 2317206
Pubmed: PMID:9369932   (View Abstract at PubMed)
PMCID: PMC5921514   (View Article at PubMed Central)

Although a close relation of somatic mutations of the adenomatous polyposis coli gene with ampullary carcinomas in familial adenomatous polyposis patients has been reported, the possible association with sporadic ampullary neoplasms has not been fully examined. We have therefore investigated loss of heterozygosity at the adenomatous polyposis coli locus and the mutational status of a portion of the adenomatous polyposis coli gene, including the mutation cluster region, in 17 ampullary carcinomas of non-familial adenomatous polyposis patients. Alteration of the adenomatous polyposis coli gene was found in 8 of 17 (47.1%) cases, as missense or insertion mutations, with or without loss of heterozygosity. Additional investigation of p53 (exons 5-8) and K-ras (codons 12 and 13) gene mutations revealed a striking mutational pattern of the p53 gene. Nine of the 17 cases demonstrated a total of 12 mutations, 6 clustered at codon 189 and 3 at codon 166. Furthermore, 5 of the 12 mutations were nonsense mutations. Regarding the K-ras gene, 4 of the 17 (23.5%) cases had mutations in codon 12, 3 of the 4 cases being derived from the intraduodenal bile duct. The findings indicate that alterations of the adenomatous polyposis coli and the p53 genes are relatively frequent in sporadic ampullary carcinomas. In particular, the clustering at specific p53 codons might offer an etiological clue to clarify ampullary carcinogenesis. Mutations of the K-ras gene, on the other hand, might be characteristic of intraduodenal bile duct origin.

RGD Manual Disease Annotations    Click to see Annotation Detail View
TermQualifierEvidenceWithReferenceNotesSourceOriginal Reference(s)
Digestive System Neoplasms  IAGP 2317206DNA:missense mutation more ...RGD 
Digestive System Neoplasms  ISOAPC (Homo sapiens)2317206; 2317206DNA:missense mutation more ...RGD 

Objects Annotated

Genes (Rattus norvegicus)
Apc  (APC regulator of WNT signaling pathway)

Genes (Mus musculus)
Apc  (APC, WNT signaling pathway regulator)

Genes (Homo sapiens)
APC  (APC regulator of WNT signaling pathway)


Additional Information