p27KIP1 deletions in childhood acute lymphoblastic leukemia.

Abstract:

:The p27KIP1 gene, which encodes a cyclin-dependent kinase (CDK) inhibitor, has been assigned to chromosome band 12p12, a region often affected by cytogenetically apparent deletions or translocations in childhood acute lymphoblastic leukemia (ALL). As described here, fluorescence in situ hybridization (FISH) analysis of 35 primary ALL samples with cytogenetic evidence of 12p abnormalities revealed hemizygous deletions of p27KIP1 in 29 cases. Further analysis of 19 of these cases with two additional gene-specific probes from the 12p region (hematopoietic cell phosphatase, HCP and cyclin D2, CCND2) showed that p27KIP1 is located more proximally on the short arm of chromosome 12 and is deleted more frequently than either HCP or CCND2. Of 16 of these cases with hemizygous deletion of p27KIP1, only eight showed loss of HCP or CCND2, whereas loss of either of the latter two loci was uniformly associated with loss of p27KIP1. Missense mutations or mutations leading to premature termination codons were not detected in the coding sequences of the retained p27KIP1 alleles in any of the 16 ALL cases examined, indicating a lack of homozygous inactivation. By Southern blot analysis, one case of primary T-cell ALL had hemizygous loss of a single p27KIP1 allele and a 34.5-kb deletion, including the second coding exon of the other allele. Despite homozygous inactivation of p27KP1 in this case, our data suggest that haploinsufficiency for p27KIP1 is the primary consequence of 12p chromosomal deletions in childhood ALL. The oncogenic role of reduced, but not absent, levels of p27KIP1 is supported by recent studies in murine models and evidence that this protein not only inhibits the activity of complexes containing CDK2 and cyclin E, but also promotes the assembly and catalytic activity of CDK4 or CDK6 in complexes with cyclin D.

journal_name

Neoplasia

authors

Komuro H,Valentine MB,Rubnitz JE,Saito M,Raimondi SC,Carroll AJ,Yi T,Sherr CJ,Look AT

doi

10.1038/sj.neo.7900033

keywords:

subject

Has Abstract

pub_date

1999-08-01 00:00:00

pages

253-61

issue

3

eissn

1522-8002

issn

1476-5586

journal_volume

1

pub_type

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