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相关概念视频

Overview of Cell Signaling01:23

Overview of Cell Signaling

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Despite the protective membrane that separates a cell from the environment, cells need the ability to detect and respond to environmental changes. Additionally, cells often need to communicate with one another. Unicellular and multicellular organisms use a variety of cell signaling mechanisms to communicate with the environment.
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Membrane lipids such as phosphatidylinositol (PI) are precursors for several membrane-bound and soluble second messengers. Specific kinases phosphorylate PI and produce phosphorylated inositol phospholipids. One such inositol phospholipids are the  phosphatidylinositol-4,5 bisphosphate [PI(4,5)P2], present in the inner half of the lipid bilayer. Upon ligand binding, GPCR stimulates Gq proteins to turn on phospholipase Cꞵ. Activated phospholipase Cꞵ cleaves PI(4,5)P2 and...
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The Hedgehog gene (Hh) was first discovered due to its control of the growth of disorganized, hair-like bristles phenotype in Drosophila, much like hedgehog spines. Hh plays a crucial role in the development of organs and the maintenance of homeostasis in both invertebrates and vertebrates. However, while Drosophila has only one Hh protein, mammals have multiple functional Hedgehog proteins - Sonic (Shh), Desert (Dhh), and Indian Hedgehog (Ihh). All of these homologous proteins have adapted to...
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Nitric oxide (NO), an inorganic gas, acts as a potent second messenger in most animal and plant tissues. NO diffuses out of the cells that produce it and enters the neighboring cells to generate a downstream response. NO synthase (NOS) catalyzes NO production by the deamination of the amino acid arginine. There are three isoforms of NOS. Endothelial cells have endothelial NOS (eNOS), nerve and muscle cells have neuronal NOS (nNOS), and macrophages produce inducible NOS (iNOS) upon exposure...
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Calmodulin (CaM) is a calcium-binding protein in eukaryotes that controls various calcium-regulated cellular processes. It has four calcium-binding sites that bind calcium to form the calcium-calmodulin ( Ca2+-CaM) complex. GPCR stimulation increases the calcium levels in the cells that bind to CaM and induces a conformational change.
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    科学领域:

    • 计算生物学 计算生物学
    • 基因组学就是基因组学.
    • 生物信息学是一种生物信息学.

    背景情况:

    • 大规模的单细胞欧米数据集正在迅速增长,推动了对先进分析工具的需求.
    • 现有的欧米基模型 (FMs) 主要使用数值转录组数据,经常忽视关键的生物医学先验知识和信号相互作用.
    • 整合不同的生物数据类型对于更深入的科学发现和精准医学至关重要.

    研究的目的:

    • 引入一种新的数据结构 - - 文本-欧米信号图 (TOSG),用于统一生物医学文本,欧米数据和信号网络.
    • 使用TOSG框架构建一个大规模的资源,OmniCellTOSG.
    • 开发一种多模式图形语言FM,CellTOSG-FM,用于分析综合生物数据.

    主要方法:

    • 开发了TOSG (Text-Omic Signaling Graph) 数据结构. 开发了文本-奥姆信号图 (TOSG) 数据结构.
    • 创建了OmniCellTOSG,一个来自约8000万个单细胞RNA-seq配置文件的约50万个元细胞TOSG的资源.
    • 构建了CellTOSG-FM,这是一个多模式图形语言基础模型.

    主要成果:

    • 与现有的OMIC FM相比,CellTOSG-FM在各种下游任务上表现出更高的性能.
    • 该模型成功地集成了文本,OMIC和信号网络信息.
    • 对与疾病相关的标和信号通路取得了可解释的见解.

    结论:

    • 该TOSG框架和CellTOSG-FM提供了一个强大的方法来分析复杂的生物数据.
    • 这种多式联络整合促进了生命科学和精密医学领域的研究.
    • 提供可解释的生物学见解,对于药物发现和疾病理解至关重要.