title: Absence of p18 mutations or deletions in lymphoid malignancies.
abstract: p18 is a recently described cyclin-dependent kinase inhibitor (CDK-I) wih homology to p16 and p15. The latter two CDK-Is have been implicated as possible tumor suppressor genes in a wide variety of human tumors, including hematological malignancies. Because of p18's structural and functional homology to p16 and p15, we hypothesized that it may also function as a tumor suppressor gene in some lymphoid malignancies. To explore this possibility we examined 81 primary lymphoid tumors for deletion and mutation p18. The primary tumors included 40 T cell malignancies and 41 B cell malignancies. None of the lymphoid tumors studied possessed deletions of p18, including a group of lymphoblastic lymphomas which we previously reported to have deletions of p16 and p15. PCR-SSCP analysis of the p18 gene identified a single polymorphism of codon 114, but failed to demonstrate mutations in any of the lymphoid tumors. These results do not support a role for p18 in the pathogenesis of the lymphoid neoplasms studied.
authors.affiliation: Hematopathology Section, Laboratory of Pathology, National Cancer Institute, National Institutes of Health, Bethesda, MD, USA.
authors.forename: T
authors.initials: T
authors.lastname: Otsuki
authors.forename: E S
authors.initials: ES
authors.lastname: Jaffe
authors.forename: A
authors.initials: A
authors.lastname: Wellmann
authors.forename: S
authors.initials: S
authors.lastname: Kumar
authors.forename: K S
authors.initials: KS
authors.lastname: Condron
authors.forename: M
authors.initials: M
authors.lastname: Raffeld
mesh_terms: D001483:Base Sequence; D002352:Carrier Proteins / Q000235:genetics; D002878:Chromosomes, Human, Pair 1; D019941:Cyclin-Dependent Kinase Inhibitor p16; D018844:Cyclin-Dependent Kinases / Q000037:antagonists & inhibitors; D017353:Gene Deletion; D016147:Genes, Tumor Suppressor / Q000235:genetics*; D006801:Humans; D007945:Leukemia, Lymphoid / Q000235:genetics* / Q000378:metabolism; D008223:Lymphoma / Q000235:genetics* / Q000378:metabolism; D008969:Molecular Sequence Data; D009154:Mutation; D009363:Neoplasm Proteins / Q000235:genetics; D016133:Polymerase Chain Reaction; D018807:Polymorphism, Single-Stranded Conformational; D012689:Sequence Homology, Nucleic Acid
chemical_list: D002352:Carrier Proteins; D019941:Cyclin-Dependent Kinase Inhibitor p16; D009363:Neoplasm Proteins; D018844:Cyclin-Dependent Kinases