Submicroscopic deletions at 7q region are associated with recurrent chromosome abnormalities in acute leukemia.

Abstract:

BACKGROUND AND OBJECTIVES:Loss of heterozygosity (LOH) on the long arm of chromosome 7 (7q) has been frequently reported in several types of human cancer including hematologic malignancies. Moreover, monosomy of chromosome 7 and 7q deletions have been associated in acute myeloid leukemia (AML) with aggressive disease and poor prognosis. DESIGN AND METHODS:Using a panel of 11 polymorphic microsatellite markers at bands 7q21-q36, we investigated fifty patients (acute myeloid leukemia [AML], n=33 and acute lymphoid leukemia [ALL], n=17) for LOH, a hallmark of possible involvement of tumor suppressor genes. In parallel, the same acute leukemia (AL) cases were studied by conventional cytogenetics. RESULTS:A total of 48 spots of allelic loss were observed in 16 (32%) out of 50 patients (AML, n=11 and ALL, n=5). Among LOH+ve cases 3 showed chromosome 7 monosomies, whereas no cytogenetically detectable abnormalities were observed in chromosome 7 in the remaining 13. INTERPRETATION AND CONCLUSIONS:Comparison with karyotypic results indicated that presence of LOH at 7q21-q36 was significantly associated with other chromosomal aberrations. In fact, an altered karyotype was detectable in 87% of LOH+ve and in 52% of LOH(-ve) AL cases (p=0.024). In addition, LOH at 7q was prevalently associated with unfavorable cytogenetic lesions (p=0.013). Our study represents the first report of a significant association between LOH and recurrent chromosomal abnormalities in AL patients suggesting that the 7q21-q36, region may be an unstable area prone to chromosome breakage in patients with an abnormal karyotype.

journal_name

Haematologica

journal_title

Haematologica

authors

Basiricò R,Pirrotta R,Fabbiano F,Mirto S,Cascio L,Pagano M,Cammarata G,Magrin S,Santoro A

keywords:

subject

Has Abstract

pub_date

2003-04-01 00:00:00

pages

429-37

issue

4

eissn

0390-6078

issn

1592-8721

journal_volume

88

pub_type

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