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相关概念视频

Replication in Eukaryotes02:31

Replication in Eukaryotes

Overview
Inheritance of Chromatin Structures03:17

Inheritance of Chromatin Structures

Epigenetics is the study of inherited changes in a cell's phenotype without changing the DNA sequences. It provides a form of memory for the differential gene expression pattern to maintain cell lineage, position-effect variegation, dosage compensation, and maintenance of chromatin structures such as telomeres and centromeres. For example, the structure and location of the centromere on chromosomes are epigenetically inherited. Its functionality is not dictated or ensured by the underlying DNA...
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The genome refers to all of the genetic material in an organism. It can range from a few million base pairs in microbial cells to several billion base pairs in many eukaryotic organisms. Genome assembly refers to the process of taking the DNA sequencing data and putting it all back together in a correct order to create a close representation of the original genome. This is followed by the identification of functional elements on the newly assembled genome, a process called genome annotation.
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Replicative cell senescence is a property of cells that allows them to divide a finite number of times throughout the organism's lifespan while preventing excessive proliferation. Replicative senescence is associated with the gradual loss of the telomere — short, repetitive DNA sequences found at the end of the chromosomes. Telomeres are bound by a group of proteins to form a protective cap on the ends of chromosomes. Embryonic stem cells express telomerase — an enzyme that adds the telomeric...
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In eukaryotic cells, DNA replication is highly conserved and tightly regulated. Multiple linear chromosomes must be duplicated with high fidelity before cell division, so there are many proteins that fulfill specialized roles in the replication process. Replication occurs in three phases: initiation, elongation, and termination, and ends with two complete sets of chromosomes in the nucleus.
Many Proteins Orchestrate Replication at the Origin
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Replicative cell senescence is a property of cells that allows them to divide a finite number of times throughout the organism's lifespan while preventing excessive proliferation. Replicative senescence is associated with the gradual loss of the telomere — short, repetitive DNA sequences found at the end of the chromosomes. Telomeres are bound by a group of proteins to form a protective cap on the ends of chromosomes. Embryonic stem cells express telomerase — an enzyme that adds the telomeric...

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基因编码的组装记录器暂时解决了细胞历史.

Yuqing Yan1,2,3, Jiaxi Lu1,2, Zhe Li4,5

  • 1Department of Materials Science and Engineering, Whiting School of Engineering, Johns Hopkins University, Baltimore, MD, USA.

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|March 3, 2026
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概括

科学家们开发了GEMINI,这是一种新的细胞内记忆装置,可以记录单个细胞的历史. 这项技术以高时空精度绘制细胞活动图,为组织生理学和疾病提供了洞察力.

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科学领域:

  • 细胞生物学 细胞生物学
  • 分子生物学分子生物学
  • 生物技术是生物技术.

背景情况:

  • 细胞因内部和外部信号而动态改变分子状态.
  • 精确的细胞活动的时空映射对于理解器官功能,疾病和再生至关重要.
  • 现有的细胞检测方法仅限于对少数细胞进行静态快照或实时监测.

研究的目的:

  • 介绍GEMINI (细胞内叙事集成的粒度扩展记忆),一个细胞内录音平台.
  • 开发一种细胞内记忆装置,用于记录单个细胞的历史.
  • 为了实现高分辨率的细胞动态的时空映射.

主要方法:

  • 使用计算设计的蛋白质组件作为细胞内存器件.
  • 双子座在活细胞内可预见地生长,产生树环状的光模式.
  • 采用基于成像的回顾性读取数据分析.

主要成果:

  • 杰米尼捕捉了细胞事件,时间准确度达到小时级.
  • 成功地绘制了差异性的NFκB介导的转录变化,具有15分钟的分辨率和可量化的信号幅度.
  • 在异种移植模型中记录了炎症诱导的信号动态,揭示了空间异质性.
  • 证明对小鼠大脑中神经元功能的影响最小,同时解决转录变化和活动模式.

结论:

  • 杰米尼为细胞动态的时空映射提供了一个强大的和可泛化的平台.
  • 能够对单个细胞中的细胞活动史进行回顾性分析.
  • 为研究复杂生物系统中的生理和病理过程提供了新的可能性.