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相关概念视频

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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Evolutionary Relationships through Genome Comparisons02:54

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Genome comparison is one of the excellent ways to interpret the evolutionary relationships between organisms. The basic principle of genome comparison is that if two species share a common feature, it is likely encoded by the DNA sequence conserved between both species. The advent of genome sequencing technologies in the late 20th century enabled scientists to understand the concept of conservation of domains between species and helped them to deduce evolutionary relationships across diverse...
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Eukaryotes have large genomes compared to prokaryotes. To fit their genomes into a cell, eukaryotic DNA is packaged extraordinarily tightly inside the nucleus. To achieve this, DNA is tightly wound around proteins called histones, which are packaged into nucleosomes that are joined by linker DNA and coil into chromatin fibers. Additional fibrous proteins further compact the chromatin, which is recognizable as chromosomes during certain phases of cell division.
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Human genetics provides a profound framework for understanding the interplay between genetic predispositions and human psychology. At the heart of this discipline lies the study of how genes influence physical traits, behaviors, and susceptibility to diseases. Each person carries a unique genetic code that subtly or significantly shapes their psychological and behavioral landscape.
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Microarrays are high-throughput and relatively inexpensive assays that can be automated to analyze large quantities of data at a time. They are used in genome-wide studies to compare gene or protein expression under two varied conditions, such as healthy and diseased states. Microarrays consist of glass or silica slides on which probe molecules are covalently attached through surface functionalization. Most commonly, the slides are prepared through the chemisorption of silanes to silica...
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Lineage Tracing and Clonal Analysis in Developing Cerebral Cortex Using Mosaic Analysis with Double Markers MADM
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人类大脑祖先的条形码

Darryl Shibata1

  • 1Department of Pathology, University of Southern California, Keck School of Medicine.

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概括
此摘要是机器生成的。

来自人类脑细胞的动态CpG甲基化条形码揭示了细胞系和发育年龄. 这些表观遗传标记捕捉了细胞祖先和线粒体历史,区分了成千上万个单个细胞.

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科学领域:

  • 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
  • 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:

  • 动态CpG甲基化模式或"条形码"对于细胞功能至关重要.
  • 了解细胞对细胞的甲基化变异是解读发育过程的关键.

研究的目的:

  • 开发和应用一种新的方法来读取来自数千个单个人类脑细胞的动态CpG甲基化条形码.
  • 为了调查这些条形码是否记录了细胞年龄,祖先和迁移模式.

主要方法:

  • 在15,000-21,000个单个人类男性脑细胞中,对约31,000个X染色体波动CpG位点 (fCpGs) 的CpG甲基化位点进行测序.
  • 对甲基化模式的分析,以计算对差异 (PWD) 和重建细胞系.
  • 甲基化条形码与细胞类型 (刺激性神经元,质细胞,抑制性神经元) 和发育时间的相关性.

主要成果:

  • CpG甲基化条形码似乎是在发育早期建立的,并记录了线粒发育年龄,晚些时候出现的细胞表现出较低的甲基化.
  • 大多数细胞对表现出明显的条形码 (PWD ~0.5),很小一部分 (<0.05 PWD) 表明密切的相关性.
  • 重建的细胞系揭示了相关细胞之间的表型相似性,除了一些例外.
  • 抑制性神经元显示了接触性迁移的证据,相关细胞在不同的皮质区域发现.

结论:

  • fCpG甲基化条形码是多态的,在发育过程中进化.
  • 这些条形码可以有效地区分成千上万个人的单个细胞.
  • 甲基化条形码为研究人类大脑细胞谱系,发育和迁移提供了强大的工具.