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相关概念视频

Evolutionary Relationships through Genome Comparisons02:54

Evolutionary Relationships through Genome Comparisons

6.8K
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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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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Cell Diversity01:13

Cell Diversity

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The concept of a cell started with microscopic observations of dead cork tissue by Robert Hooke in 1665. Hooke coined the term "cell" based on the resemblance of the small subdivisions in the cork to the rooms that monks inhabited, called cells. About ten years later, Antonie van Leeuwenhoek became the first person to observe the living and moving cells under a microscope. In the century that followed, the theory that cells represented the basic unit of life developed.
Multicellular...
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Gene Evolution - Fast or Slow?02:05

Gene Evolution - Fast or Slow?

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The genomes of eukaryotes are punctuated by long stretches of sequence which do not code for proteins or RNAs. Although some of these regions do contain crucial regulatory sequences, the vast majority of this DNA serves no known function. Typically, these regions of the genome are the ones in which the fastest change, in evolutionary terms, is observed, because there is typically little to no selection pressure acting on these regions to preserve their sequences.
In contrast, regions which code...
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Gene Evolution - Fast or Slow?02:05

Gene Evolution - Fast or Slow?

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Multi-species Conserved Sequences02:51

Multi-species Conserved Sequences

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Next-generation sequencing technologies have created large genomic databases of a variety of animals and plants. Ever since the human genome project was completed, scientists studied the genome of primates, mammals, and other phylogenetically distant living beings. Such large-scale  studies have provided new insights into the evolutionary relationship between organisms.
Although the genome of each species varies greatly from each other, a few sequences are highly conserved. Such conserved...
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相关实验视频

Updated: Jan 10, 2026

Single-cell Gene Expression Using Multiplex RT-qPCR to Characterize Heterogeneity of Rare Lymphoid Populations
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使用MultiVeloVAE,从多个血统,多个奥姆和多个样本的单细胞数据中推断差异动态.

Chen Li1, Yichen Gu2, Maria C Virgilio1,3

  • 1Department of Computational Medicine and Bioinformatics, University of Michigan, Ann Arbor, MI, USA.

Nature communications
|November 20, 2025
PubMed
概括

这项研究介绍了MultiVeloVAE,这是一个新的计算工具,用于分析单细胞多原子数据,以了解细胞分化动态. 它提供了关于基因表达和染色体在发育过程中的可访问性的新见解.

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科学领域:

  • 生物医学科学 生物医学科学
  • 计算生物学 计算生物学
  • 基因组学就是基因组学.

背景情况:

  • 细胞分化对于理解专门的细胞命运至关重要.
  • 单细胞多原子分析提供了对动态分子变化的洞察力.
  • 现有的RNA速度方法与多个血统,多个样本和多个原子单细胞数据作斗争.

研究的目的:

  • 开发一个用于多样本RNA速度推断的计算框架,使用集成的单细胞RNA和多原子数据.
  • 为了解决处理复杂单细胞数据集的先前方法的局限性.
  • 为了能够在细胞分化过程中识别差异化的分子动态.

主要方法:

  • 介绍了MultiVeloVAE,一种用于RNA速度推断的概率框架.
  • 集成的单细胞RNA和多原子数据 (基因表达和染色质可访问性).
  • 在共享时间尺度上建模动态,处理血统分叉和多样本推断.

主要成果:

  • MultiVeloVAE成功地模拟了基因表达和染色体可访问性动态.
  • 该框架支持从部分重叠的模式的数据集进行多样本推断.
  • 使用人类胚胎体和巨分化的数据,对染色质可访问性和基因表达动态进行了新的洞察.

结论:

  • 对于复杂的单细胞数据,MultiVeloVAE克服了以前的RNA速度方法的局限性.
  • 该框架提供了一个强大的工具,用于分析多原子单细胞数据,以研究细胞分化.
  • 提供了人类发育和细胞专业化过程中的分子动力学的新理解.