Deletions of the cyclin-dependent kinase-4 inhibitor gene in multiple human cancers.
Cytogenetic abnormalities of chromosome 9p21 are characteristic of malignant melanomas, gliomas, lung cancers and leukaemias. From a panel of 46 human malignant cell lines, we localized by positional cloning the most frequently deleted region on 9p21. Sequence analysis of the isolated fragment reveals two open reading frames identical to the recently described complementary DNA for the inhibitor of cyclin-dependent kinase 4 (CDK4). Polymerase chain reaction and Southern blot analysis confirmed the frequent deletion or rearrangement of the CDK4-inhibitor gene in melanomas, gliomas, lung cancers and leukaemias, and the absence of detectable gene transcripts. One carcinoma had a deletion entirely within the CDK4-inhibitor gene. The CDK4-inhibitor gene from a patient with dysplastic nevus syndrome had a germ-line nonsense mutation. The CDK4 inhibitor is thought to be a physiological suppressor of proliferation. Cells unable to produce the inhibitor may be prone to neoplastic transformation.
Nobori
T
T
Department of Medicine, University of California, San Diego, La Jolla 92093-0663.
Miura
K
K
Wu
D J
DJ
Lois
A
A
Takabayashi
K
K
Carson
D A
DA
D001483:Base Sequence; D002352:Carrier Proteins / Q000235:genetics*; D002874:Chromosome Mapping; D002899:Chromosomes, Human, Pair 9; D051358:Cyclin-Dependent Kinase 4; D019941:Cyclin-Dependent Kinase Inhibitor p16; D018844:Cyclin-Dependent Kinases; D016213:Cyclins / Q000502:physiology; D004247:DNA; D017353:Gene Deletion; D016147:Genes, Tumor Suppressor; D006801:Humans; D008969:Molecular Sequence Data; D009369:Neoplasms / Q000201:enzymology / Q000235:genetics*; D047428:Protein Kinase Inhibitors; D011518:Proto-Oncogene Proteins; D011683:Purine-Nucleoside Phosphorylase / Q000235:genetics; D014407:Tumor Cells, Cultured
D002352:Carrier Proteins; D019941:Cyclin-Dependent Kinase Inhibitor p16; D016213:Cyclins; D047428:Protein Kinase Inhibitors; D011518:Proto-Oncogene Proteins; D004247:DNA; D011683:Purine-Nucleoside Phosphorylase; C021784:5'-methylthioadenosine phosphorylase; C495900:CDK4 protein, human; D051358:Cyclin-Dependent Kinase 4; D018844:Cyclin-Dependent Kinases