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相关概念视频

Neurulation01:30

Neurulation

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Neurulation is the embryological process which forms the precursors of the central nervous system and occurs after gastrulation has established the three primary cell layers of the embryo: ectoderm, mesoderm, and endoderm. In humans, the majority of this system is formed via primary neurulation, in which the central portion of the ectoderm—originally appearing as a flat sheet of cells—folds upwards and inwards, sealing off to form a hollow neural tube. As development proceeds, the...
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Cellular Differentiation00:57

Cellular Differentiation

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How does a complex organism such as a human develop from a single cell? It all starts from a single fertilized egg which gives rise to a vast array of cell types, such as nerve cells, muscle cells, and epithelial cells that characterize the adult? Throughout development and adulthood, cellular differentiation leads cells to assume their final morphology and physiology. Differentiation is the process by which unspecialized cells become specialized to carry out distinct functions.
A zygote is a...
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Gene Duplication and Divergence02:37

Gene Duplication and Divergence

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The seminal work of Ohno in 1970 popularized the idea of gene duplication and divergence. DNA sequence comparison studies reveal that a large portion of the genes in bacteria, archaebacteria, and eukaryotes was  generated by gene duplication and divergence, indicating its critical role in evolution.
The duplicated copies of the gene are called Paralogs. Paralogs with similar sequences and functions form a gene family. Across several species, a large number of gene families are...
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Eukaryotic Evolution01:24

Eukaryotic Evolution

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The endosymbiont theory is the most widely accepted theory of eukaryotic evolution; however, its progression is still somewhat debated. According to the nucleus-first hypothesis, the ancestral prokaryote first evolved a membrane to enclose DNA and form the nucleus. Conversely, the mitochondria-first hypothesis suggests that the nucleus was formed after endosymbiosis of mitochondria.
Contrary to the endosymbiont theory, the eukaryote-first hypothesis proposes that the simpler prokaryotic and...
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Exon Recombination02:32

Exon Recombination

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The evolution of new genes is critical for speciation. Exon recombination, also known as exon shuffling or domain shuffling, is an important means of new gene formation. It is observed across vertebrates, invertebrates, and in some plants such as potatoes and sunflowers. During exon recombination, exons from the same or different genes recombine and produce new exon-intron combinations, which might evolve into new genes. 
Exon shuffling follows “splice frame rules.” Each exon...
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Synteny and Evolution02:31

Synteny and Evolution

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John H. Renwick first coined the term “synteny” in 1971, which refers to the genes present on the same chromosomes, even if they are not genetically linked. The species with common ancestry tend to show conserved syntenic regions. Therefore, the concept of synteny is nowadays used to describe the evolutionary relationship between species.
Around 80 million years ago, the human and mice lineages diverged from the common ancestor. During the course of evolution, the ancestral...
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相关实验视频

Updated: May 16, 2025

Lineage Tracing and Clonal Analysis in Developing Cerebral Cortex Using Mosaic Analysis with Double Markers MADM
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基因组进化重塑胚胎大脑中的细胞类型多样化.

Duoyuan Chen1, Zhenkun Zhuang2, Maolin Huang3

  • 1BGI Research, Hangzhou 310030, China; BGI Research, Shenzhen 518083, China; Key Laboratory of Spatial Omics of Zhejiang Province, BGI Research, Hangzhou 310030, China; State Key Laboratory of Genome and Multi-omics Technologies, BGI Research, Hangzhou 310030, China.

Developmental cell
|May 14, 2025
PubMed
概括

这项研究揭示了羊动物的进化大脑差异,通过创建一个大型单细胞地图. 关键的发现包括鸟类特异性细胞类型和与适应相关的基因表达模式.

关键词:
氨基子是什么意思大脑科学 大脑科学小脑小脑是什么意思细胞类型的演变.一个核的RNA-seqq.电话传感器 (telencephalon) 的使用

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相关实验视频

Last Updated: May 16, 2025

Lineage Tracing and Clonal Analysis in Developing Cerebral Cortex Using Mosaic Analysis with Double Markers MADM
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科学领域:

  • 进化生物学是进化的生物学.
  • 神经科学是一个神经科学.
  • 基因组学就是基因组学.

背景情况:

  • 羊动物在3200万年里进化了复杂的大脑和认知能力.
  • 这些变化背后的基因和基因表达机制在很大程度上仍未被探索.

研究的目的:

  • 为了创建一个全面的单细胞地图的羊水细胞telencephalon和小脑.
  • 在整个进化过程中识别细胞类型的特定物种变异,保护和多样化.
  • 研究驱动大脑进化和适应的遗传机制.

主要方法:

  • 创建了一个由来自乌,鸟类 (斑马,子),老鼠和的超过130万个细胞组成的单细胞地图.
  • 利用单细胞分辨率空间转录组学来分析基因表达模式.
  • 在不同物种中对细胞类型和基因表达进行了比较分析.

主要成果:

  • 确定了脑电刺激神经元 (EXs) 和小脑细胞类型的显著物种特异性变异.
  • 在鸟类和哺乳动物EXs中观察到不同的基因表达模式 (SLC17A6与SLC17A7).
  • 发现了一种与KDM1A通路和积极选择的基因相关的鸟类特异性普尔金耶细胞亚型 (SVIL+).

结论:

  • 特定物种的细胞类型和基因表达有助于胎儿大脑进化和认知多样性.
  • 鸟类Purkinje细胞中的KDM1A通路和积极选择的基因表明适应的进化优化.
  • 遗传多样化在为生态和行为适应开发专门的细胞类型方面发挥着至关重要的作用.