细胞类型的专业化由特定的染色体拓编码
Warren Winick-Ng1, Alexander Kukalev2, Izabela Harabula2,3
1Max-Delbrück Centre for Molecular Medicine, Berlin Institute for Medical Systems Biology, Epigenetic Regulation and Chromatin Architecture Group, Berlin, Germany. warren.winick-ng@mdc-berlin.de.
Nature
|November 18, 2021
概括
我们开发了immunoGAM来绘制特定类型脑细胞的3D染色体结构, 这种方法揭示了染色体组织如何与基因表达和特殊的神经元功能有关.
科学领域:
- 基因组学和分子生物学
- 神经科学
- 表观遗传学
背景情况:
- 三维 (3D) 染色体结构对于基因调节和细胞功能至关重要.
- 现有的染色体构成捕获方法在绘制神经系统方面存在局限性,特别是在没有组织解离的情况下对动态变化和细胞类型的特异性.
研究的目的:
- 开发和应用一种新的方法,即 immunoGAM,用于在单个动物的特定脑细胞类型中绘制全基因组的3D染色素拓.
- 研究细胞类型的3D染色体结构与大脑中的基因表达模式之间的关系.
主要方法:
- 免疫GAM是基因组架构映射 (GAM) 的扩展,利用核冷切割的无绑定技术来映射基因组拓.
- 它可以从复杂的组织中选择细胞类型,使用较低的细胞数量 (约. 避免组织分离.
- 通过分析跨核切片的DNA位点的共同分离概率来确定染色体相互作用.
主要成果:
- 细胞类型的专用3D染色体结构在多个基因组尺度上绘制,与基因表达模式相关联.
- 在高表达和/或高染色体可访问性期间观察到长基因的广泛"融化".
- 神经元亚型特定的接触涉及与成和突触可塑性相关的基因,在可访问的染色体中具有转录因子结合位.
- 感官受体基因被发现在异色区间中,形成长距离接触.
结论:
- 在单个动物分辨率下研究特定脑细胞的3D染色体组织提供了一个强大的工具.
- 大脑细胞中的特定染色体结构与基因调节机制和专门的细胞功能密切相关.
- 这些发现突显了3D基因组架构在神经元细胞身份和功能中的重要性.
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