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相关概念视频

Tagging and Fusion Proteins01:24

Tagging and Fusion Proteins

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Proteins are involved in several cellular processes and biochemical reactions. Analyzing a specific protein of interest requires it to be isolated from the other proteins in the cell. This is achieved by overexpressing the specific gene in a suitable host to produce large quantities of the target protein. A tag or label is recombined with the gene to produce a fusion protein containing the target protein and the tag. The tags on these fusion proteins can then be used for easy detection and...
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相关实验视频

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A Computational Pipeline for Intergenic/Intragenic Enhancer RNA Quantification in Mouse Embryonic Stem Cells
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使用单细胞多组数据区分因果与标记增强剂.

Elizabeth Dorans, Alkes L Price

    medRxiv : the preprint server for health sciences
    |February 27, 2026
    PubMed
    概括

    来自共同可访问区域的标记效应可以在单细胞多组数据中在增强剂和基因之间创建非因果关系. 考虑到这些影响对于准确的增强剂-基因关联分析至关重要.

    科学领域:

    • 基因组学就是基因组学.
    • 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
    • 计算生物学 计算生物学

    背景情况:

    • 单细胞RNA-seq+ATAC-seq多基因数据链接增强剂通过染色质可访问性和基因表达通过基因.
    • ATAC-seq峰值之间的相关性可以导致非因果"标记"峰值基因链接.

    研究的目的:

    • 通过使用多原子数据,研究和量化峰值基因链接中普遍存在的"标记"效应.
    • 开发方法来区分因果与非因果增强剂-基因关联.

    主要方法:

    • 根据与附近的峰值和基因的相关性,为ATAC-seq峰值定义了"共同可访问性"和"共同活性"得分.
    • 分析了四个多组数据集 (86k细胞,6种免疫/血细胞类型).
    • 使用CRISPRi和eQTL数据进行验证和回归分析 (S-CASC).

    主要成果:

    • 协同可访问性和协同活动性得分高度相关 (r=0.57-0.73),表明了普遍的标记效应.
    • 标记效应并非由技术因素来解释,而是与共同可访问性相一致.
    • 因果关联在特定的功能区域 (例如,TSS附近,H3K27ac标志) 中得到丰富,并由先驱转录因子驱动.
    • 使用SuSiE精细映射的峰值基因链接在验证数据集中表现优于边际链接.

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    结论:

    • 由于峰值共同可访问性,标记效应在单细胞多组数据中很普遍,使增强剂-基因链接复杂化.
    • 区分因果关系和非因果关系需要考虑这些标记效应.
    • 精确的增强剂-基因关联对于理解基因调节和解释GWAS发现的复杂特征至关重要.