首页> 外文学位 >The t(14;21)(q11.2;q22) chromosomal translocation associated with T-cell acute lymphoblastic leukemia activates the BHLHB1 and BHLHB2 genes.
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The t(14;21)(q11.2;q22) chromosomal translocation associated with T-cell acute lymphoblastic leukemia activates the BHLHB1 and BHLHB2 genes.

机译:与T细胞急性淋巴细胞白血病相关的t(14; 21)(q11.2; q22)染色体易位激活了BHLHB1和BHLHB2基因。

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摘要

Patients with T-cell acute lymphoblastic leukemia (T-ALL), often have chromosomal translocations that involve juxtaposition of T-cell receptor (TCR) α, β, δ or elements to proto-oncogene in their leukemic cells. The mechanism underlying these translocations most likely involves illegitimate V (D) J recombination. The most common chromosomal translocations recognized in patients with T-ALL result in the activation of latent proto-oncogenes such as SCL/TAL1, LYL1, TAL2, LMO1, LMO2 , and MYC, usually by juxtaposition of these genes to TCR regulatory elements. We identified a patient with T-ALL and a novel t(14;21)(q11.2;q22) chromosomal translocation. We cloned the genomic translocation breakpoints; sequence analysis of the genomic breakpoints indicated that the translocation had been mediated by an illegitimate V (D) J recombination event that disrupted the TCRA locus and placed the TCRA locus enhancer on the derivative 21 chromosome. We identified two previously unreported transcripts, designated BHLHB1 and BHLHB2 (for basic domain, helix-loop-helix protein, class II, 1 and 2, respectively) that had been activated by the translocation. BHLHB1 and BHLHB2 mapped to the region of chromosome 21 that has been proposed to be responsible, at least in part, for the learning deficits seen in children with Down's syndrome. BHLHB1 and BHLHB2 are conserved in murine DNA. Although BHLHB1 and BHLHB2 expression normally are neural tissue specific, T-cell lymphoblasts with the t(14;21)(q11.2;q.22) also expressed high levels of BHLHB1 and BHLHB2 mRNA. Expression of BHLHB1 dramatically inhibited E2A-mediated transcription activation in NIH 3T3 fibroblasts and Jurkat T cells. This data suggests that BHLHB1, similar to SCL/TAL1, may exert a leukemogenic effect through a functional inactivation of E2A or related proteins.
机译:患有T细胞急性淋巴细胞白血病(T-ALL)的患者经常发生染色体易位,涉及T细胞受体( TCR )α,β,δ或白血病原癌基因元素的并置细胞。这些易位的基础机制很可能涉及非法的V(D)J重组。 T-ALL患者中最常见的染色体易位导致潜在原癌基因的激活,例如 SCL / TAL1,LYL1,TAL2,LMO1,LMO2 MYC ,通常将这些基因与 TCR 调节元件并置。我们确定了一名患有T-ALL和新型t(14; 21)(q11.2; q22)染色体易位的患者。我们克隆了基因组易位断点;基因组断裂点的序列分析表明,易位是由非法的V(D)J重组事件介导的,该事件破坏了 TCRA 基因座,并将 TCRA 基因座增强子置于突变体上。衍生21染色体。我们确定了两个以前未报告的转录本,分别称为 BHLHB1 BHLHB2 (对于基本域,分别是II类,1类和2类螺旋环-螺旋蛋白)。通过易位。 BHLHB1 BHLHB2 映射到21号染色体的区域,该区域被建议至少部分负责唐氏综合症患儿的学习障碍。小鼠DNA中的 BHLHB1 BHLHB2 是保守的。尽管 BHLHB1 BHLHB2 表达通常是神经组织特异性的,但t(14; 21)(q11.2; q.22)的T细胞淋巴母细胞也表达高水平 BHLHB1 BHLHB2 mRNA的表达。 BHLHB1 的表达显着抑制了NIH 3T3成纤维细胞和Jurkat T细胞中 E2A 介导的转录激活。这些数据表明, BHLHB1 SCL / TAL1 类似,可能通过E2A或相关蛋白的功能失活而发挥致白血病作用。

著录项

  • 作者

    Wang, Junjie.;

  • 作者单位

    State University of New York at Buffalo.;

  • 授予单位 State University of New York at Buffalo.;
  • 学科 Biology Genetics.; Health Sciences Immunology.; Biology Molecular.; Health Sciences Oncology.
  • 学位 Ph.D.
  • 年度 2003
  • 页码 126 p.
  • 总页数 126
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 遗传学;预防医学、卫生学;分子遗传学;肿瘤学;
  • 关键词

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