Ectopic expression of MAFB gene in human myeloma cells carrying (14;20)(q32;q11) chromosomal translocations.

Ectopic expression of MAFB gene in human myeloma cells carrying (14;20)(q32;q11) chromosomal translocations.
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DOI:
10.1111/j.1349-7006.2001.tb01142.x
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发表时间:
2001-06
期刊:
Japanese journal of cancer research : Gann
影响因子:
--
通讯作者:
Ueda R
Ueda R
中科院分区:
其他
文献类型:
--
作者:
Hanamura I;Iida S;Akano Y;Hayami Y;Kato M;Miura K;Harada S;Banno S;Wakita A;Kiyoi H;Naoe T;Shimizu S;Sonta SI;Nitta M;Taniwaki M;Ueda R

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染色体 14q+ 代表涉及免疫球蛋白重链基因 (IgH) 位点的染色体重排,是人类多发性骨髓瘤 (MM) 的遗传标志。在这里,我们报告了在 MM 细胞中发现的 (14;20)(q32;qll) 染色体易位的鉴定。双色荧光原位杂交分析在两个 MM 细胞系的 20qll 位点处精确定位了 KIAA0823 和 MAFB 基因位点之间最多 680 kb 长度内的断点。在断点附近的转录序列中,MAFB 基因的异位表达被证明与 t(14;20) 相关,该基因位于断点之一端粒 450-680 kb 处,编码 MAF 家族基本区/亮氨酸拉链转录因子的成员。这一发现与之前描述其转化活性的研究一起表明,MAFB 基因可能是由于 t(14;20) 而被 IgH 基因调节元件解除管制的靶标之一。
Chromosome 14q+, which represents a chromosomal rearrangement involving the immunoglobulin heavy chain gene (IgH) locus, is a genetic hallmark of human multiple myeloma (MM). Here, we report the identification of (14;20)(q32;qll) chromosomal translocations found in MM cells. Double color fluorescence in situ hybridization analyses pinpointed the breakpoints at the 20qll locus in two MM cell lines within a length of at most 680 kb between the KIAA0823 and MAFB gene loci. Among the transcribed sequences in the vicinity of the breakpoints, an ectopic expression of the MAFB gene, which is located at 450‐680 kb telomeric to one of the breakpoints and encodes a member of the MAF family basic region/leucine zipper transcription factor, was demonstrated to be associated with t(14;20). This finding, together with that of a previous study describing its transforming activity, suggests that the MAFB gene may be one of the targets deregulated by regulatory elements of the IgH gene as a result of t(14;20).
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