Amplification of the translocated c-myc genes in three Burkitt lymphoma cell lines.

Amplification of the translocated c-myc genes in three Burkitt lymphoma cell lines.
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三种伯基特淋巴瘤细胞系中易位的 c-myc 基因的扩增。

DOI:
10.1016/s0378-1119(98)00104-8
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发表时间:
1998
期刊:
影响因子:
3.5
通讯作者:
Leffak,M
Leffak,M
中科院分区:
生物学3区
文献类型:
--
作者:
Khaira,P;James,CD;Leffak,M

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人类c-myc基因编码外显子的易位是人类Burkitt淋巴瘤的一致特征。在BL细胞系CA46、JD40和ST486中,c-myc第二外显子和第三外显子已移位到免疫球蛋白重链位点。除了这种重排,我们还发现在所有三种细胞系中,易位的c-myc外显子相对于胚系c-myc基因的限制性片段表现出低水平的扩增。IgM开关区探针的杂交模式表明,免疫球蛋白重链序列与易位的c-myc序列共扩增。用差示沉淀法确定扩增的序列是位于高分子量染色体还是低分子量染色体外DNA中。在JD40和ST486细胞中,扩增出的c-myc序列位于大分子染色体上;在ST486细胞中,与CA46细胞一样,在低分子量染色体外DNA中也含有易位的c-myc序列。HeLa、CA46、ST486和JD40中期染色体的荧光原位杂交(FISH)证实了上述结论。这些结果表明,在ST486和CA46细胞中,存在对含有c-myc表达序列扩增拷贝的细胞的持续选择,并且存在移位的c-myc序列的染色体外拷贝的持续产生。
Translocations of the coding exons of the human c-myc gene are consistent features of human Burkitt lymphomas (BL). In the BL cell lines CA46, JD40, and ST486, the second and third c-myc exons have been translocated into the immunoglobulin heavy chain locus. In addition to this rearrangement, in all three cell lines, we have found that the translocated c-myc exons show low-level amplification relative to restriction fragments from the germ-line c-myc gene. The patterns of hybridization of an IgM switch region probe suggest that immunoglobulin heavy chain sequences have been co-amplified with the translocated c-myc sequences. Differential sedimentation was used to determine whether the amplified sequences reside in high-molecular-weight chromosomes or low-molecular-weight extrachromosomal DNA. In JD40 and ST486 cells, the amplified c-myc sequences were found on high-molecular-weight chromosomes; ST486 cells also contained translocated c-myc sequences in low-molecular-weight, extrachromosomal DNA, as did CA46 cells. These conclusions were corroborated by fluorescence in-situ hybridization (FISH) of HeLa, CA46, ST486 and JD40 metaphase chromosomes. These results suggest that there is ongoing selection for cells containing amplified copies of the expressed c-myc sequences, and that there is continuous generation of extrachromosomal copies of the translocated c-myc sequences in ST486 and CA46 cells.
通过与禽骨髓细胞瘤病毒 MC29 的转化基因 delta gag-myc 比较,鸡 c-myc 基因的核苷酸序列分析揭示了同源且独特的编码区。
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发表时间: 1983
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DOI: --
发表时间: 1986
影响因子: 5.3
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