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相关概念视频

Cell Polarization by Rho Proteins01:21

Cell Polarization by Rho Proteins

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Cell polarity is the asymmetric distribution of cellular and membrane components, making one side of the cell different from the other. This polarity is essential to many processes such as embryogenesis, axon migration, glucose transport across epithelial cells, and directional cell migration. A migrating cell responds to intracellular or extracellular signals via molecular cascades that reorganize the actin cytoskeleton to establish this polarity. In these cells, the Rho family proteins Cdc42,...
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piRNA - Piwi-interacting RNAs02:57

piRNA - Piwi-interacting RNAs

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PIWI-interacting RNAs, or piRNAs, are the most abundant short non-coding RNAs. More than 20,000 genes have been found in humans that code for piRNAs while only 2000 genes have been found for miRNAs. piRNAs can act at the transcriptional and post-transcriptional levels and have a vital role in silencing transposable elements present in germ cells. They are also involved in epigenetic silencing and activation. Previously, they were thought to function only in germ cells but new evidence suggests...
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Experimental RNAi02:15

Experimental RNAi

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RNA interference (RNAi) is a cellular mechanism that inhibits gene expression by suppressing its transcription or activating the RNA degradation process. The mechanism was discovered by Andrew Fire and Craig Mello in 1998 in plants. Today, it is observed in almost all eukaryotes, including protozoa, flies, nematodes, insects, parasites, and mammals. This precise cellular mechanism of gene silencing has been developed into a technique that provides an efficient way to identify and determine the...
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Cytoskeletal Coordination in Cell Migration01:32

Cytoskeletal Coordination in Cell Migration

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A migrating cell changes its shape during the cyclic events of attachment and detachment from the substratum and repositions the cell organelles correspondingly. These complex events are orchestrated by the dynamic cytoskeletal network comprising actin filaments, intermediate filaments, and microtubules. Cytoskeletal crosstalk — the direct and indirect communication between the different components — is crucial for this coordination. Direct communication involves various linker...
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siRNA - Small Interfering RNAs02:30

siRNA - Small Interfering RNAs

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Small interfering RNAs, or siRNAs, are short regulatory RNA molecules that can silence genes post-transcriptionally, as well as the transcriptional level in some cases. siRNAs are important for protecting cells against viral infections and silencing transposable genetic elements.
In the cytoplasm, siRNA is processed from a double-stranded RNA, which comes from either endogenous DNA transcription or exogenous sources like a virus. This double-stranded RNA is then cleaved by the...
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相关实验视频

Updated: Jul 2, 2025

The C. elegans Intestine As a Model for Intercellular Lumen Morphogenesis and In Vivo Polarized Membrane Biogenesis at the Single-cell Level: Labeling by Antibody Staining, RNAi Loss-of-function Analy
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一个可扩散的基于小RNA的图灵系统动态地协调器官极性.

Emanuele Scacchi1, Gael Paszkiewicz2, Khoa Thi Nguyen2,3

  • 1Center for Plant Molecular Biology, University of Tübingen, Tübingen, Germany. emanuele.scacchi@zmbp.uni-tuebingen.de.

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概括
此摘要是机器生成的。

植物叶子的发育依赖于上下极性,由使用移动小RNA的自组织图灵系统调节. 这个系统确保了叶子生长的正确极性,并解释了不同的叶子形状.

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科学领域:

  • 植物发育生物学植物发育生物学
  • 分子遗传学 分子遗传学
  • 系统生物学 系统生物学

背景情况:

  • 叶子形成需要精确的相轴-相轴 (上下) 极性.
  • 在器官生长过程中这种极性的基本模式原则尚未完全理解.

研究的目的:

  • 为了阐明调节Arabidopsis thaliana叶的轴向-轴向极性的自我组织机制.
  • 研究小RNAs在树叶极性建立和维持中的作用.

主要方法:

  • 利用计算建模来模拟图灵反应扩散系统.
  • 分析了移动小RNAs在调节极性的动态.
  • 检查了与脊椎动物左右模式的并行.

主要成果:

  • 展示了一个以移动小RNA为中心的器官自主图灵反应扩散系统,调节叶子极性.
  • 表明图灵动力学,通过预先模式化的信息暂时指导,在成长中的器官中保持自我维持的极性.
  • 计算模型证实了该系统适应强大的平面极性和各种器官形状的适应性.

结论:

  • 一个小型基于RNA的图灵网络动态调节器官极性.
  • 这种自我组织的系统解释了不同植物物种的叶子形状多样性.
  • 这些发现提供了关于发育模式和进化适应的见解.