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在果中量化3D基因组组织的形状异质性

Samira Mali¹, Igor S Tolokh¹, Erik Cross²

¹Department of Computer Science, Virginia Polytechnic Institute and State University, Blacksburg, Virginia, United States of America.

|July 3, 2025

概括

我们开发了一种新的度量标准 - - 形态异质性 (C.H. ),以测量细胞对细胞的3D染色体结构变化. 更高分辨率的模型通常显示出更大的异质性,这对了解核组织和细胞功能的影响更大.

科学领域:

基因组学就是基因组学.
计算生物学计算生物学
细胞生物学细胞生物学

背景情况:

细胞间相染色体的三维 (3D) 组织表现出细胞间细胞的变异性.
了解这种结构异质性对于理解基因组调节和功能至关重要.

研究的目的:

为了提出和验证一种新型的度量标准,格式异质性 (C.H. ) 用于量化单细胞间的3D染色质构成变异性.
用不同的建模方法分析和比较果X染色体构造中的细胞对细胞异质性.

主要方法:

符合性异质性 (C.H.) 的定义作为特定基因组分离的每细胞平均欧几里德间位距离的标准偏差.
应用C.H.的应用. 用于分析来自大量Hi-C,DamID和单细胞Hi-C数据的染色体模型的度量.
开发一种算法来比较C.H. 在不同分辨率的模型中.

主要成果:

较高分辨率的染色体模型通常表现出增加的形态异质性 (C.H. ) 的情况.
模型解析对C.H.的影响在基因组距离超过大约100kb时,基因组距离会减少.
在C.H.中存在显著差异. 在使用批量Hi-C和单细胞Hi-C数据的模型之间观察到趋势,特别是在TAD尺度之外.

结论:

这项研究引入了一种可靠的指标,用于评估3D染色体的结构变异性.
将批量Hi-C数据集成到基于单细胞Hi-C的模型中可能会提高准确性.
核膜的枯竭似乎增加了染色质的结构异质性,可能会影响细胞功能的可变性.

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