Spatial organization of the mouse genome and its role in recurrent chromosomal translocations.

Spatial organization of the mouse genome and its role in recurrent chromosomal translocations.
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小鼠基因组的空间组织及其在复发性染色体易位中的作用。

DOI:
10.1016/j.cell.2012.02.002
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发表时间:
2012-03-02
期刊:
影响因子:
64.5
通讯作者:
Dekker J
Dekker J
中科院分区:
生物学1区
文献类型:
--
作者:
Zhang Y;McCord RP;Ho YJ;Lajoie BR;Hildebrand DG;Simon AC;Becker MS;Alt FW;Dekker J

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The extent to which the three dimensional organization of the genome contributes to chromosomal translocations is an important question in cancer genomics. We now have generated a high resolution Hi-C spatial organization map of the G1-arrested mouse pro-B cell genome and mapped translocations from target DNA double strand breaks (DSBs) within it via high throughput genome-wide translocation sequencing. RAG endonuclease-cleaved antigen-receptor loci are dominant translocation partners for target DSBs regardless of genomic position, reflecting high frequency DSBs at these loci and their co-localization in a fraction of cells. To directly assess spatial proximity contributions, we normalized genomic DSBs via ionizing-radiation. Under these conditions, translocations were highly enriched in cis along single chromosomes containing target DSBs and within other chromosomes and sub-chromosomal domains in a manner directly related to pre-existing spatial proximity. Our studies reveal the power of combining two high-throughput genomic methods to address long-standing questions in cancer biology.
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