Stage-resolved Hi-C analyses reveal meiotic chromosome organizational features influencing homolog alignment.

Stage-resolved Hi-C analyses reveal meiotic chromosome organizational features influencing homolog alignment.
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阶段解析的 Hi-C 分析揭示了影响同源比对的减数分裂染色体组织特征

DOI:
10.1038/s41467-021-26033-0
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发表时间:
2021-10-08
影响因子:
16.6
通讯作者:
Bian Q
Bian Q
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Zuo W;Chen G;Gao Z;Li S;Chen Y;Huang C;Chen J;Chen Z;Lei M;Bian Q

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在减数分裂过程中,染色体在形态和核内定位方面表现出巨大变化。这些变化如何影响同源配对,对准和重组仍然难以捉摸。使用HI-C,我们在小鼠精子发生过程中系统地绘制了所有减数分裂的预言构造中的3D基因组结构。我们的数据发现,当发生同源物对齐时,在早期减数分裂预言期间,沿染色体轴沿染色体轴变化的两个主要染色体组织特征。首先,转录活性和非活性基因组区域分别形成由较短和更长的染色质环组成的交替结构域。其次,力传输的linc络合物促进了在多达20%的染色体长度范围内不同染色体的末端对齐。这两种特征都与同源相互作用的模式和重组事件的分布相关。总的来说,我们的数据揭示了转录和力对减数分裂染色体结构的影响,并建议染色体组织可以为调节较高真核生物的减数分裂重组提供基础设施。 在减数分裂过程中,染色体发生了巨大的形态和核内定位变化。在这里,作者通过分类细胞的HI-C绘制了整个小鼠精子发生的3D基因组结构,以揭示转录活性和机械力在调节同源物排列和重组中的贡献。
During meiosis, chromosomes exhibit dramatic changes in morphology and intranuclear positioning. How these changes influence homolog pairing, alignment, and recombination remain elusive. Using Hi-C, we systematically mapped 3D genome architecture throughout all meiotic prophase substages during mouse spermatogenesis. Our data uncover two major chromosome organizational features varying along the chromosome axis during early meiotic prophase, when homolog alignment occurs. First, transcriptionally active and inactive genomic regions form alternating domains consisting of shorter and longer chromatin loops, respectively. Second, the force-transmitting LINC complex promotes the alignment of ends of different chromosomes over a range of up to 20% of chromosome length. Both features correlate with the pattern of homolog interactions and the distribution of recombination events. Collectively, our data reveal the influences of transcription and force on meiotic chromosome structure and suggest chromosome organization may provide an infrastructure for the modulation of meiotic recombination in higher eukaryotes.
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