title: Concurrent amplification of cyclin E and CDK2 genes in colorectal carcinomas.
abstract: The genetic changes of cyclin A, DI, E and CDK2 were examined in human colorectal carcinomas by Southern-blot analysis. Gene amplification of cyclin E was detected in 5 of 53 (9.4%) primary colorectal carcinoma tissues. Interestingly, in 3 of 5 tumors showing cyclin E gene amplification, the CDK2 gene was amplified simultaneously with rearrangements. No obvious correlation was detected between gene amplification and clinicopathological features of colorectal carcinomas. Out of 7 colon carcinoma cell lines, 2 showed gene amplification of cyclin E without gene amplification of CDK2. No amplification of cyclin A or DI gene was found in any of the colorectal carcinoma tissues or colon carcinoma cell lines. Our results suggest that the concurrent amplification of cyclin E and CDK2 genes may play a role in colorectal carcinogenesis.
authors.affiliation: First Department of Pathology, Hiroshima University School of Medicine, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Kitahara
authors.forename: W
authors.initials: W
authors.lastname: Yasui
authors.forename: H
authors.initials: H
authors.lastname: Kuniyasu
authors.forename: H
authors.initials: H
authors.lastname: Yokozaki
authors.forename: Y
authors.initials: Y
authors.lastname: Akama
authors.forename: S
authors.initials: S
authors.lastname: Yunotani
authors.forename: T
authors.initials: T
authors.lastname: Hisatsugu
authors.forename: E
authors.initials: E
authors.lastname: Tahara
mesh_terms: D000368:Aged; D042846:CDC2-CDC28 Kinases; D015179:Colorectal Neoplasms / Q000235:genetics*; D051357:Cyclin-Dependent Kinase 2; D018844:Cyclin-Dependent Kinases / Q000235:genetics*; D016213:Cyclins / Q000235:genetics*; D005260:Female; D005784:Gene Amplification; D006801:Humans; D008297:Male; D017346:Protein Serine-Threonine Kinases / Q000235:genetics*; D014407:Tumor Cells, Cultured
chemical_list: D016213:Cyclins; D017346:Protein Serine-Threonine Kinases; D042846:CDC2-CDC28 Kinases; C495894:CDK2 protein, human; D051357:Cyclin-Dependent Kinase 2; D018844:Cyclin-Dependent Kinases