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使用单细胞奥米克数据量化 X 染色体失活脱离的数据,揭示了细胞类型和组织之间的异质性

Yoshihiko Tomofuji¹, Ryuya Edahiro², Kyuto Sonehara¹

¹Department of Statistical Genetics, Osaka University Graduate School of Medicine, Suita 565-0871, Japan; Integrated Frontier Research for Medical Science Division, Institute for Open and Transdisciplinary Research Initiatives, Osaka University, Suita 565-0871, Japan; Laboratory for Systems Genetics, RIKEN Center for Integrative Medical Sciences, Yokohama 230-0045, Japan; Department of Genome Informatics, Graduate School of Medicine, the University of Tokyo, Tokyo 113-8654, Japan.

|July 31, 2024

概括

脱离X染色体失活 (XCI) 的情况因细胞类型而异. 一个新的工具scLinaX揭示了淋巴细胞中的基因逃逸比组织中的髓状细胞更强,影响了遗传关联.

科学领域:

遗传学是一个遗传学.
基因组学就是基因组学.
细胞生物学细胞生物学

背景情况:

在女性中,X染色体不活化 (XCI) 会使一个X染色体上的大多数基因沉默.
几种X链基因逃脱了XCI,但它们在多种细胞类型和组织中的表达模式在很大程度上是未知的.
了解XCI逃脱异质性对于解释性别偏差遗传效应至关重要.

研究的目的:

开发一种使用单细胞RNA测序 (scRNA-seq) 数据量化XCI基因逃逸的方法.
为了研究XCI在各种人体组织中的细胞类型特异性差异.
探索XCI逃逸对基因型-表型关联的功能影响.

主要方法:

开发scLinaX,这是一个用于分析scRNA-seq数据的计算工具,用于从非活化的X染色体量化相对基因表达.
在大规模的血液和多器官scRNA-seq数据集中应用scLinaX.
scLinaX与染色质可访问性数据 (scLinaX-multi) 的整合.
对全基因组关联研究 (GWAS) 性别之间的效应大小进行比较分析.

主要成果:

scLinaX 准确量化了被禁用 X 染色体的相对基因表达.
淋巴细胞表现出明显更强的XCI基因逃逸与血中的髓状细胞相比.
这种逃脱模式在多个器官的淋巴组织和淋巴细胞中是一致的.
scLinaX-multi表示在染色质可访问性水平上,淋巴细胞比髓状细胞更强烈地逃脱.
XCI逃生影响基因型-表型关联,可能解释性别差异.

结论:

scLinaX提供了一种可靠的方法来评估XCI逃脱异质性在单细胞水平.
在不同细胞类型和组织中存在XCI逃逸的显著变化,特别是突出淋巴细胞.
XCI逃逸的量化目录提供了对基因调节及其对人类健康和疾病的影响的见解.

关键词:

一个X染色体是X染色体.性别差异的性别差异.单细胞的奥米克.

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