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相关概念视频

Position-effect Variegation02:32

Position-effect Variegation

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In 1928, a German botanist Emil Heitz observed the moss nuclei with a DNA binding dye. He observed that while some chromatin regions decondense and spread out in the interphase nucleus, others do not. He termed them euchromatin and heterochromatin, respectively. He proposed that the heterochromatin regions reflect a functionally inactive state of the genome. It was later confirmed that heterochromatin is transcriptionally repressed, and euchromatin is transcriptionally active chromatin.
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Gene Duplication and Divergence02:37

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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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Comparing Copy Number Variations and SNPs02:26

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Sequencing of the human genome has opened up several best-kept secrets of the genome. Scientists have identified thousands of genome variations that exist within a population. These variations can be a single nucleotide or a larger chromosomal variation.
Copy number variations or CNVs are the structural variations that cover more than 1kb of DNA sequence. The single nucleotide polymorphism (SNP), on the other hand, is a single nucleotide change or a point mutation that is found in more than 1%...
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Regulated mRNA Transport02:22

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In eukaryotes, transcription and translation are compartmentalized; an mRNA is first synthesized in the nucleus and then selectively transported to the cytoplasm for protein synthesis. Before transport, a pre-mRNA undergoes several steps of post-transcriptional modifications including splicing, 5' capping, and the addition of a poly-adenine tail. Various proteins bind to the pre-mRNA during these modifications. The mRNA transport takes place with the help of multiple proteins playing...
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Regulation of Expression at Multiple Steps01:23

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The gene expression in cells is regulated at different stages: (i) transcription, (ii) RNA processing, (iii) RNA localization, and (iv) translation. Transcriptional regulation is mediated by regulatory proteins such as transcription factors, activators, or repressors—these control gene expression by initiating or inhibiting the transcription of genes. Once a precursor or pre-mRNA is produced, it undergoes post-transcriptional modification, including 5' capping, splicing, and the...
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相关实验视频

Updated: Jun 6, 2025

Spatial Profiling of Protein and RNA Expression in Tissue: An Approach to Fine-Tune Virtual Microdissection
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精确的空间异质解剖和基因调控解释空间转录学使用双图对比学习.

Zhuohan Yu1, Yuning Yang2, Xingjian Chen3

  • 1School of Artificial Intelligence, Jilin University, Jilin, 130012, China.

Advanced science (Weinheim, Baden-Wurttemberg, Germany)
|November 28, 2024
PubMed
概括

一种名为stDCL的新方法使用双图对比学习来识别空间域,并在空间转录组学数据中解释基因调控,改进组织微环境分析.

关键词:
双图对比学习学习的双图对比学习.基因调节 基因调节 基因调节图表对比的学习学习.空间异质性 空间异质性

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Author Spotlight: Impact of Intergenic Interactions on Disease-Identifying Dark Biomarkers
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科学领域:

  • 基因组学就是基因组学.
  • 生物信息学是一种生物信息学.
  • 计算生物学 计算生物学

背景情况:

  • 空间转录学保留了基因表达和空间上下文,用于高分辨率的组织分析.
  • 了解组织微环境需要采用捕捉空间异质性和基因调节的方法.
  • 目前的方法难以同时描述空间结构和基因调节.

研究的目的:

  • 开发一种新的方法,stDCL,用于识别空间域,并从空间转录组学数据中解释基因调控.
  • 通过整合基因表达和空间信息来增强空间转录学分析.
  • 克服现有空间剖析和基因解释方法的局限性.

主要方法:

  • stDCL采用双图对比式学习方法.
  • 一个嵌入自编码器的图形适应性地整合了基因表达和空间数据.
  • 对比式学习确保潜伏嵌入反映空间分布和集群相似性.

主要成果:

  • 与皮层数据集上的最先进的方法相比,stDCL在识别空间域方面表现出更高的准确性.
  • 该方法重建了空间层次结构,并完善了微分表达式分析.
  • stDCL揭示了基因调节,高分辨率的空间异质性和胚胎发育模式.

结论:

  • stDCL有效地识别空间域,并在空间转录组学数据中解释基因调节.
  • 该方法准确地捕捉空间异质性和生物机制.
  • 在疾病关联研究中,stDCL显示出潜力,例如在阿尔茨海默病中注释天体细胞亚型.