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Japanese Journal of Cancer Research : Gann logoLink to Japanese Journal of Cancer Research : Gann
. 2001 Oct;92(10):1048–1056. doi: 10.1111/j.1349-7006.2001.tb01059.x

Molecular Analysis of Tumor Suppressor Genes, Rb, p53,pl6INK4A, pl5INK4B and p14ARF in Natural Killer Cell Neoplasms

Sakura Sakajiri 1, Norihiko Kawamata 1,✉, Motoki Egashira 1, Kiyoshi Mori 1, Kazuo Oshimi 1
PMCID: PMC5926606  PMID: 11676855

Abstract

Natural killer (NK) cell neoplasms, which are derived from mature or precursor NK cells, are rare diseases and are observed predominantly in Asian countries. We analyzed the status of the Rb, p53, p15INK4B, p16INK4A and p14ARF genes in these diseases by Southern blot, polymerase chain reaction–single strand conformational polymorphism (PCR–SSCP) and western blot analysis. We used 31 NK cell neoplasms, including four cell lines derived from NK cell neoplasms, 3 myeloid/ NK cell precursor acute leukemias, 4 blastic NK cell lymphoma/leukemias, 4 aggressive NK cell leukemia/lymphomas, 4 nasal NK cell lymphomas, and 12 chronic NK lymphocytosis. We found gene amplification of the p53 gene in one nasal NK cell lymphoma, and point mutations of the p53 gene in one blastic NK cell lymphoma/leukemia and one chronic NK lymphocytosis. In addition, homozygous deletions ofpl5,p16 andp14 genes in 5 out of 31 samples were detected; 3 were from nasal NK cell lymphoma and 2 from blastic NK cell lymphoma/leukemia. Also hemizygous deletion of the Kb gene in one blastic NK cell lymphoma was detected. Rb proteins were highly expressed in one cell line as well as two myeloid/NK cell precursor acute leukemias. In other cell lines, complete loss and an aberrant migration pattern of Rb protein expression were observed. Comparative genomic hybridization suggested that the homozygous deletions of the p15, p16 and p14 were subtle chromosomal deletions and could not be identified by standard karyotyping in some cases. Although the number of cases we analyzed was not large, alterations identified in the Rb, p53, p16, p15 and p14 genes are of significance and might be associated with tumorigenesis in NK cell neoplasms

Keywords: Homozygous deletion, Point mutation, PCR, SSCP, Comparative genomic hybridization

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