Distinct comparative genomic hybridisation profiles in gastric mucosa-associated lymphoid tissue lymphomas with and without t(11;18)(q21;q21)

British Journal of Haematology
Yuanping ZhouMing-Qing Du

Abstract

t(11;18)(q21;q21) occurs specifically in mucosa-associated lymphoid tissue (MALT) lymphoma and the translocation generates a functional API2-MALT1 fusion product that activates nuclear factor (NF)kappaB. t(11;18) positive lymphomas usually lack the chromosomal aberrations and microsatellite alterations frequently seen in the translocation-negative MALT lymphomas. To further understand their genetic differences, we investigated gastric MALT lymphomas with and without t(11;18) by comparative genomic hybridisation. In general, both chromosomal gains and losses were far more frequent in t(11;18)-negative (median = 3.4 imbalances) than t(11;18)-positive cases (median = 1.6 imbalances), with gains being more frequent than losses. Recurrent chromosomal gains involving whole or major parts of a chromosome were seen for chromosomes 3, 12, 18 and 22 (23%, 19%, 19% and 27% respectively). Discrete recurrent chromosomal gains were found at 9q34 (11/26 = 42%). Bioinformatic analysis of genes mapping to 9q34 revealed potential targets. Among them, TRAF2 and CARD9 are known interaction partners of BCL10, playing a role in NFkappaB activation. Interphase fluorescent in situ hybridisation confirmed genomic gain of the TRAF2, CARD9 and MALT1 loci...Continue Reading

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Citations

Mar 16, 2013·Tumour Biology : the Journal of the International Society for Oncodevelopmental Biology and Medicine·Yajun GuFang Zheng
Oct 5, 2013·Seminars in Cancer Biology·Andrés J M FerreriMaurilio Ponzoni
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