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Streubel, B. et al.

Streubel, Vinatzer, Lamprecht, Raderer, Chott,

T(3;14)(p14.1;q32) involving IGH and FOXP1 is a novel recurrent chromosomal aberration in MALT lymphoma.

The three chromosomal translocations t(11;18)(q21;q21), t(14;18)(q32;q21), and t(1;14)(p22;q32) are associated with MALT lymphoma. In a case of MALT lymphoma of the thyroid, we observed t(3;14)(p14.1;q32) by cytogenetic analysis. Fluorescence in situ hybridization studies showed that the immunoglobulin heavy chain locus (IGH) was rearranged on chromosome 14. Long-distance inverse polymerase chain reaction identified FOXP1 as the partner gene on chromosome 3. To determine the frequency of the t(3;14)(p14.1;q32), two fluorescence in situ hybridization assays were established to screen 91 MALT lymphomas, all of which were negative for the above-mentioned three translocations, and eight splenic and six nodal marginal zone lymphomas. Overall, nine MALT lymphomas (10%) harbored t(3;14)(p14.1;q32) comprising tumors of the thyroid (three of six), ocular adnexa (four of 20), and skin (two of 20), whereas those of the stomach (n = 20), salivary gland (n = 20), and lung (n = 5) were negative as well as the splenic and nodal marginal zone lymphomas. Most t(3;14)(p14.1;q32) + MALT lymphomas harbored additional genetic abnormalities, such as trisomy 3. Further studies revealed that the three known translocations and t(3;14)(p14.1;q32) are mutually exclusive. Real-time quantitative reverse transcriptase polymerase chain reaction showed upregulation of FOXP1 in cases with t(3;14)(p14.1;q32) or trisomy 3. This study identifies FOXP1 as a new translocation partner of IGH in a site-dependent subset of MALT lymphomas.[1]

References

T(3;14)(p14.1;q32) involving IGH and FOXP1 is a novel recurrent chromosomal aberration in MALT lymphoma. Streubel, B., Vinatzer, U., Lamprecht, A., Raderer, M., Chott, A. Leukemia (2005) [Pubmed]

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