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Recurrent loss, but lack of mutations, of the SMARCB1 tumor suppressor gene in T-cell prolymphocytic leukemia with TCL1A-TCRAD juxtaposition


Bug, S; Dürig, J; Oyen, F; Klein-Hitpass, L; Martin-Subero, J I; Harder, L; Baudis, M; Arnold, N; Kordes, U; Dührsen, U; Schneppenheim, R; Siebert, R (2009). Recurrent loss, but lack of mutations, of the SMARCB1 tumor suppressor gene in T-cell prolymphocytic leukemia with TCL1A-TCRAD juxtaposition. Cancer Genetics and Cytogenetics, 192(1):44-47.

Abstract

In T-cell prolymphocytic leukemia (T-PLL), chromosomal imbalances affecting the long arm of chromosome 22 are regarded as typical chromosomal aberrations secondary to a TCRAD-TCL1A fusion due to inv(14) or t(14;14). We analyzed recently obtained data from conventional karyotyping, SNP-chip array copy number mapping, genome-wide expression profiling, and interphase fluorescence in situ hybridization (FISH) of inv(14)-positive T-PLL with respect to structural aberrations on chromosome 22. Combined gene chip and interphase FISH analyses revealed interstitial deletions on 22q in 4 of 12 cases, with one case additionally showing a terminal copy number gain. A minimally deleted region of approximately 9.1 Mb was delineated, from 16.2 Mb (22cen) to 25.3 Mb (22q12.1). The distal borders of copy number alterations spread over a region of approximately 8.8 Mb, from 25.2 Mb (22q12.1) to 34 Mb (22q12.3). Mutation screening of candidate tumor suppressor genes SMARCB1 and CHEK2 mapping to the minimally deleted and the breakpoint regions, respectively, in cases with hemizygous deletion, revealed no inactivating mutations. With gene expression profiling, no significantly downregulated genes were identified in the minimally deleted region. We therefore assume that haploinsufficiency or alternative pathomechanisms underlie chromosome 22 aberrations in T-PLL.

In T-cell prolymphocytic leukemia (T-PLL), chromosomal imbalances affecting the long arm of chromosome 22 are regarded as typical chromosomal aberrations secondary to a TCRAD-TCL1A fusion due to inv(14) or t(14;14). We analyzed recently obtained data from conventional karyotyping, SNP-chip array copy number mapping, genome-wide expression profiling, and interphase fluorescence in situ hybridization (FISH) of inv(14)-positive T-PLL with respect to structural aberrations on chromosome 22. Combined gene chip and interphase FISH analyses revealed interstitial deletions on 22q in 4 of 12 cases, with one case additionally showing a terminal copy number gain. A minimally deleted region of approximately 9.1 Mb was delineated, from 16.2 Mb (22cen) to 25.3 Mb (22q12.1). The distal borders of copy number alterations spread over a region of approximately 8.8 Mb, from 25.2 Mb (22q12.1) to 34 Mb (22q12.3). Mutation screening of candidate tumor suppressor genes SMARCB1 and CHEK2 mapping to the minimally deleted and the breakpoint regions, respectively, in cases with hemizygous deletion, revealed no inactivating mutations. With gene expression profiling, no significantly downregulated genes were identified in the minimally deleted region. We therefore assume that haploinsufficiency or alternative pathomechanisms underlie chromosome 22 aberrations in T-PLL.

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Item Type:Journal Article, refereed, original work
Communities & Collections:04 Faculty of Medicine > University Hospital Zurich > Clinic for Hematology
04 Faculty of Medicine > Functional Genomics Center Zurich
07 Faculty of Science > Institute of Molecular Life Sciences
04 Faculty of Medicine > University Hospital Zurich > Division of Cellular and Molecular Pathology (former)
04 Faculty of Medicine > Institute of Molecular Cancer Research
07 Faculty of Science > Institute of Molecular Cancer Research

08 University Research Priority Programs > Systems Biology / Functional Genomics
08 University Research Priority Programs > Systems Biology / Functional Genomics
Dewey Decimal Classification:570 Life sciences; biology
610 Medicine & health
Language:English
Date:2009
Deposited On:03 Jun 2009 09:21
Last Modified:05 Apr 2016 13:15
Publisher:Elsevier
ISSN:0165-4608
Publisher DOI:10.1016/j.cancergencyto.2009.03.001
PubMed ID:19480937
Permanent URL: http://doi.org/10.5167/uzh-18970

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