J-mediated Translocations in Lymphoid Neoplasms : A Functional Assessment of Genomic Instability by Cryptic Sites

J-mediated Translocations in Lymphoid Neoplasms : A Functional Assessment of Genomic Instability by Cryptic Sites
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淋巴肿瘤中 J 介导的易位:隐性位点基因组不稳定性的功能评估

DOI:
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发表时间:
2001
期刊:
影响因子:
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Aggggtcaggccagaatg
Aggggtcaggccagaatg
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Tactggtat Agcctagatgtgtttaga;Tgagaaagga;Tgtggggtacg;Ctccag;Aaggtctctggg;Ttgcttccaagtt;Cccacagtcctctact;Tgctgtacacatcggtg;Tgggcggactggcca;Acacctggcg;Ctcctcaggt;Tgacctcagaactcatct;Aggggtcaggccagaatg

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大多数淋巴系统恶性肿瘤是由免疫球蛋白(Ig)/T细胞受体(TCR)基因片段和细胞原癌基因之间的特定染色体易位引起的。在许多情况下,不合法的V(D)J重组被认为参与了易位过程,但这一点从未在功能上得到证实。利用染色体外重组试验,我们确定了几个原癌基因靶向V(D)J重组的能力,并评估了它们的重组潜力对体内易位率的影响。我们的数据支持两种不同的机制:在T细胞急性淋巴细胞性白血病(T-ALL)中,涉及LMO2、TAL2和TAL1的易位与TCR基因座和带有偶然但功能性重组位点(类型1)的原癌基因座位之间的非法V(D)J重组是相容的;相反,在B细胞非霍奇金淋巴瘤(B-NHL)中,涉及BCL1和BCL2的易位与仅由V(D)J重组(类型2)介导的IGH基因座断裂是相容的。最重要的是,我们证明了涉及LMO2的t(11;14)(p13;q32)易位在正常人胸腺中出现的频率非常高,并且LMO2隐蔽位点赋予的重组潜力直接预测了该位点的体内易位水平。这些发现为B和T细胞肿瘤发生中基因组不稳定性的调节力提供了新的见解。
Most lymphoid malignancies are initiated by specific chromosomal translocations between immunoglobulin (Ig)/T cell receptor (TCR) gene segments and cellular proto-oncogenes. In many cases, illegitimate V(D)J recombination has been proposed to be involved in the translocation process, but this has never been functionally established. Using extra-chromosomal recombination assays, we determined the ability of several proto-oncogenes to target V(D)J recombination, and assessed the impact of their recombinogenic potential on translocation rates in vivo. Our data support the involvement of 2 distinct mechanisms: translocations involving LMO2, TAL2, and TAL1 in T cell acute lymphoblastic leukemia (T-ALL), are compatible with illegitimate V(D)J recombination between a TCR locus and a proto-oncogene locus bearing a fortuitous but functional recombination site (type 1); in contrast, translocations involving BCL1 and BCL2 in B cell non-Hodgkin’s lymphomas (B-NHL), are compatible with a process in which only the IgH locus breaks are mediated by V(D)J recombination (type 2). Most importantly, we show that the t(11;14)(p13;q32) translocation involving LMO2 is present at strikingly high frequency in normal human thymus, and that the recombinogenic potential conferred by the LMO2 cryptic site is directly predictive of the in vivo level of translocation at that locus. These findings provide new insights into the regulation forces acting upon genomic instability in B and T cell tumorigenesis.
DOI: 10.1126/science.2551037
发表时间: 1989-09
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影响因子: 56.9
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正常胸腺细胞发育中 IgH 基因的重排。
DOI: --
发表时间: 1988
期刊: Journal of immunology (Baltimore, Md. : 1950)
影响因子: --
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DOI: --
发表时间: 1993
期刊: Leukemia
影响因子: 11.4
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DOI: --
发表时间: 1988
期刊: Oncogene
影响因子: 8
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通讯作者: Croce,CM