Inactivation of the ATM gene in T-cell prolymphocytic leukemias.

Abstract:

:T-cell prolymphocytic leukemia (T-PLL) is a rare form of mature leukemia that occurs both in adults as a sporadic disease and in younger patients suffering an hereditary condition, ataxia telangiectasia (AT). The ATM gene, located in the 11q22-23 chromosomal region, is consistently mutated in AT patients. The strong predisposition of AT patients to develop T-PLL and the high frequency of T-cell leukemias/lymphomas observed in atm-deficient mice, together with the known functions of the ATM protein, led us to evaluate the ATM gene as a potential tumor suppressor gene involved in T-PLL. Paired leukemic and nonleukemic cells were obtained from a series of 15 patients suffering sporadic T-PLLs, allowing loss of heterozygosity (LOH) analysis. LOH of the 11q22-23 region was detected in 10 of these 15 cases (67%). The minimal deleted region was defined as an approximately 2.5 Mb interval that contained the ATM gene. No ATM rearrangement or biallelic deletion was detected by Southern blotting in the T-PLL series. However, in five T-PLLs with LOH of the 11q22-23 region, Western blot analysis showed either undetectable (3 cases) or decreased levels (1 case) of ATM protein, whereas ATM was present at high levels in cases without LOH. The protein truncation test (PTT) was then used to search for mutations in the ATM gene. Four mutations (1 nonsense, 2 aberrant splicings, and 1 missense) were detected in patients with LOH and none in patients without LOH of the region. The acquired character of these ATM mutations was demonstrated in three patients. Altogether, allelic ATM inactivations by large deletions or mutations were found in approximately two thirds of T-PLL. ATM is thus a tumor suppressor gene whose inactivation is a key event in the development of T-cell prolymphocytic leukemias.

journal_name

Blood

journal_title

Blood

authors

Stoppa-Lyonnet D,Soulier J,Laugé A,Dastot H,Garand R,Sigaux F,Stern MH

subject

Has Abstract

pub_date

1998-05-15 00:00:00

pages

3920-6

issue

10

eissn

0006-4971

issn

1528-0020

journal_volume

91

pub_type

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