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Assignment1 of B-cell lymphoma 6, member B (zinc finger protein) gene (BCL6B) to human chromosome 17p13.1 by in situ hybridization

Rearrangement of the B cell lymphoma 6 (BCL6) gene on chromosome 3q27 is a recurrent translocation event in nonHodgkin’s lymphoma (Bastard et al., 1994; Chaganti et al., 1998). The frequency of these rearrangements depend on the histology of the tumour and are found in approximately 10% and 30% of Follicular and Diffuse large B cell lymphomas respectively (Ohno and Fukuhara, 1997). BCL6B (BCL6 member B, previously BAZF), a novel BCL6 homologue (Okabe et al., 1998), has recently been cloned in the mouse. There are three regions of homology between the two proteins, the BTB/ POZ domain at the NH2-terminal region, a perfectly conserved 17 aa sequence in the middle region and the zinc finger domain at the COOH-terminus. All three domains are required for BCL6B to bind the BCL6 DNA binding sequence and act as a transcriptional repressor, suggesting that both proteins regulate similar target genes. This raises the possibility that BCL6B may also be involved in lymphomagenesis. Materials and methods