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相关概念视频

Gene Conversion02:08

Gene Conversion

Other than maintaining genome stability via DNA repair, homologous recombination plays an important role in diversifying the genome. In fact, the recombination of sequences forms the molecular basis of genomic evolution. Random and non-random permutations of genomic sequences create a library of new amalgamated sequences. These newly formed genomes can determine the fitness and survival of cells. In bacteria, homologous and non-homologous types of recombination lead to the evolution of new...
Synteny and Evolution02:31

Synteny and Evolution

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 chromosome underwent...
Exon Recombination02:32

Exon Recombination

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 has three reading...
Crossing Over01:30

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Crossing over is the exchange of genetic information between homologous chromosomes during prophase I of meiosis I. Genetic recombination gives rise to allelic diversity in the newly formed daughter cells. In humans, crossing over produces genetically distinct haploid egg and sperm cells that undergo fertilization to produce unique offspring. Before cell division starts, the germ cell’s chromosome(s) undergo duplication in the S phase of the cell cycle. As the cells enter prophase I, duplicated...

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相关实验视频

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Dissection of Hippocampal Dentate Gyrus from Adult Mouse
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解开人类下阴前带带皮层内转录组异质性的纠.

Aaron K Jenkins1, Micah A Shelton1, RuoFei Yin2

  • 1Translational Neuroscience Program, Department of Psychiatry, University of Pittsburgh School of Medicine, 450 Technology Drive, Suite 223, Pittsburgh, PA 15219, United States.

Cerebral cortex (New York, N.Y. : 1991)
|July 25, 2024
PubMed
概括

研究人员探索了人类下阴前环状皮质 (sgACC) 中的基因表达. 他们在皮层3层和5层之间发现了不同的转录形状,这表明了在这种情感处理大脑区域内的功能差异.

关键词:
通过RNA测序来测序RNA序列.不同的表达方式,不同的表达方式.功能性神经解剖学 功能性神经解剖学激光捕捉微解剖技术的微解剖技术在死后进行尸检.

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科学领域:

  • 神经科学是一个神经科学.
  • 分子生物学分子生物学
  • 基因组学就是基因组学.

背景情况:

  • 阴茎下前环皮质 (sgACC) 对于处理情绪和影响至关重要.
  • sgACC包括多个布罗德曼区域 (BA),具有不同的细胞架构.
  • 在一些sgACC BA中,第5层进一步分为子层 (L5a和L5b),影响投射目标.

研究的目的:

  • 研究人类sgACC的布罗德曼区域 (BA),层和子层之间的转录差异.
  • 了解 sgACC 中潜在的功能异质性的分子基础.
  • 确定sgACC的规范性转录特征.

主要方法:

  • 激光捕获微解剖被用来从人类sgACC收集特定的皮质层条纹.
  • 在收集的样本上进行了RNA测序,以分析基因表达特征.
  • 进行了途径分析,以解释观察到的转录差异的功能影响.

主要成果:

  • 在sgACC中,Brodmann区域 (BA) 之间没有发现显著的转录差异.
  • 在sgACCBAs中,在Layer 3和Layer 5 (L5a/L5b) 之间发现了显著和一致的转录表达差异.
  • 第5层子层 (L5a和L5b) 呈现出类似的转录特征.
  • 途径分析揭示了重叠的突触功能过程,但具有明显的丰富性:细胞-细胞结合和树突的第3层,大脑发育和突触前功能的第5层.

结论:

  • 人类sgACC中的皮层显示出不同的转录形状,特别是在第3层和第5层之间.
  • 这些层特定的转录差异表明sgACC中的潜在功能专业化.
  • 该研究提供了对sgACC规范转录格局的基本理解.