T(14;18)(q32;q21) involving IGH and MALT1 is a frequent chromosomal aberration in MALT lymphoma.

Abstract:

:T(11;18)(q21;q21) is the most common structural abnormality in extranodal marginal zone B-cell lymphoma of mucosa-associated lymphoid tissue (MALT lymphoma) leading to the fusion of the apoptosis inhibitor-2 (API2) gene and the MALT lymphoma-associated translocation (MALT1) gene. In 2 patients with MALT lymphoma of the liver and skin, respectively, t(14;18)(q32;q21) was observed by cytogenetic analysis. Subsequent fluorescence in situ hybridization (FISH) studies disclosed that the immunoglobulin heavy-chain locus (IGH) and the MALT1 gene were rearranged by this translocation. In order to screen a large series of MALT lymphomas for this aberration, a 2-color interphase FISH assay was established. Among a total of 66 cases, t(14;18)(q32;q21) involving IGH and MALT1 was detected in MALT lymphomas of the liver (4 of 4), skin (3 of 11), ocular adnexa (3 of 8), and salivary gland (2 of 11), but did not occur in MALT lymphomas of the stomach (n = 10), intestine (n = 9), lung (n = 7), thyroid (n = 4), or breast (n = 2). In total, 12 of 66 (18%) MALT lymphomas harbored t(14;18)(q32;q21); 7 additional cases of splenic marginal zone lymphoma tested negative. All of the 12 MALT lymphomas featuring the t(14;18)(q32;q21) were negative for t(11;18)(q21;q21) by reverse transcriptase-polymerase chain reaction (RT-PCR). However, trisomy 3 and/or 18 was found in 4 of 12 cases, suggesting that the t(14;18)(q32;q21) does not occur as the sole genetic abnormality. This study identifies IGH as a new translocation partner of MALT1 in MALT lymphomas, which tend to arise frequently at sites other than the gastrointestinal tract and lung. In contrast to t(11;18)(q21;q21)(+) MALT lymphomas, those with t(14;18)(q32;q21) may harbor additional genetic abnormalities.

journal_name

Blood

journal_title

Blood

authors

Streubel B,Lamprecht A,Dierlamm J,Cerroni L,Stolte M,Ott G,Raderer M,Chott A

doi

10.1182/blood-2002-09-2963

subject

Has Abstract

pub_date

2003-03-15 00:00:00

pages

2335-9

issue

6

eissn

0006-4971

issn

1528-0020

pii

2002-09-2963

journal_volume

101

pub_type

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