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A comprehensive analysis of the CDKN2A gene in childhood acute lymphoblastic leukemia reveals genomic deletion, copy number neutral loss of heterozygosity, and association with specific cytogenetic subgroups

Lookup NU author(s): Sarina Sulong, Professor Anthony Moorman, Professor Julie Irving, Marian Case, Professor Simon Bailey, Dr Nicholas Bown, Dr Andrew Hall, Professor Christine Harrison

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Abstract

Inactivation of the tumor suppressor gene, CDKN2A, can occur by deletion, methylation, or mutation. We assessed the principal mode of inactivation in childhood acute lymphoblastic leukemia (ALL) and frequency in biologically relevant subgroups. Mutation or methylation was rare, whereas genomic deletion occurred in 21% of B-cell precursor ALL and 50% of T-ALL patients. Single nucleotide polymorphism arrays revealed copy number neutral (CNN) loss of heterozygosity (LOH) in 8% of patients. Array-based comparative genomic hybridization demonstrated that the mean size of deletions was 14.8 Mb and biallelic deletions composed a large and small deletion (mean sizes, 23.3 Mb and 1.4 Mb). Among 86 patients, only 2 small deletions were below the resolution of detection by fluorescence in situ hybridization. Patients with high hyperdiploidy, ETV6-RUNX1, or 11q23/MLL rearrangements had low rates of deletion (11%, 15%, 13%), whereas patients with t(9;22), t(1;19), TLX3, or TLX1 rearrangements had higher frequencies (61%, 42%, 78%, and 89%). In conclusion, CDKN2A deletion is a significant secondary abnormality in childhood ALL strongly correlated with phenotype and genotype. The variation in the incidence of CDKN2A deletions by cytogenetic subgroup may explain its inconsistent association with outcome. CNN LOH without apparent CDKN2A inactivation suggests the presence of other relevant genes in this region.


Publication metadata

Author(s): Sulong S, Moorman AV, Irving JAE, Strefford JC, Konn ZJ, Case MC, Minto L, Barber KE, Parker H, Wright SL, Stewart ARM, Bailey S, Bown NP, Hall AG, Harrison CJ

Publication type: Article

Publication status: Published

Journal: Blood

Year: 2009

Volume: 113

Issue: 1

Pages: 100-107

Date deposited: 26/04/2010

ISSN (print): 0006-4971

ISSN (electronic): 1528-0020

Publisher: American Society of Hematology

URL: http://dx.doi.org/10.1182/blood-2008-07-166801

DOI: 10.1182/blood-2008-07-166801


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