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相关概念视频

Evolutionary Relationships through Genome Comparisons02:54

Evolutionary Relationships through Genome Comparisons

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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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Phylogeny01:23

Phylogeny

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Phylogeny is concerned with the evolutionary diversification of organisms or groups of organisms. A group of organisms with a name is called a taxon (singular). Taxa (plural) can span different levels of the evolutionary hierarchy. For instance, the group containing all birds is a taxon (comprising the class Aves), and the group of all species of daisies (the genus Bellis) is a taxon. Phylogenies can likewise include just one genus (i.e., depict species relationships) or span an entire kingdom.
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Phylogenetic Trees03:21

Phylogenetic Trees

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Phylogenetic trees come in many forms. It matters in which sequence the organisms are arranged from the bottom to the top of the tree, but the branches can rotate at their nodes without altering the information. The lines connecting individual nodes can be straight, angled, or even curved.
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Gene Evolution - Fast or Slow?02:05

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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.
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Pharmacokinetic models are mathematical constructs that represent and predict the time course of drug concentrations in the body, providing meaningful pharmacokinetic parameters. These models are categorized into compartment, physiological, and distributed parameter models.
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The “tree of life” describes the evolution of life and the evolutionary relationships between organisms. The root of the tree is the common ancestor to all life on Earth. All other species radiate from this point, much like the branches of a tree. The numerous tips of these branches on the tree of life represent every living, or extant, species. Extinct species, which are species that no longer exist, can be found towards the center of the tree. Currently, these organisms, both...
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相关实验视频

Updated: May 14, 2025

Using Phylogenetic Analysis to Investigate Eukaryotic Gene Origin
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使用概率学主题建模估计全基因组的族系.

Marzieh Khodaei1, Scott V Edwards2, Peter Beerli1

  • 1Department of Scientific Computing, Florida State University, Tallahassee, FL 32306, USA.

Systematic biology
|May 5, 2025
PubMed
概括
此摘要是机器生成的。

本研究介绍了TopicContml,这是一种使用隐性迪里克莱特分配 (LDA) 的无对齐的基因组学方法,用于从全基因组数据中快速推断进化历史. 该方法在模拟和多样化的生物数据集中被证明是高效和稳健的.

关键词:
在 k-mers 里面.持续的 持续的在 LDA LDA 中.在NLP中,我们使用了NLP.没有对齐的自由对齐.启动链条 (bootstrap) 是一个启动链条.多个地方的基因组.主题建模主题建模

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相关实验视频

Last Updated: May 14, 2025

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Using Phylogenetic Analysis to Investigate Eukaryotic Gene Origin

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A Practical Guide to Phylogenetics for Nonexperts
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科学领域:

  • 计算生物学 计算生物学
  • 进化遗传学 进化遗传学
  • 生物信息学是一种生物信息学.

背景情况:

  • 全基因组数据为推断进化历史提供了前所未有的分辨率.
  • 现有的基因组学方法在大型基因组数据集下面临着计算的局限性.
  • 无调整的方法正在出现,作为克服这些挑战的一种方式.

研究的目的:

  • 开发和实施一种高效,无对齐的计算方法,用于推断全基因组的基因系.
  • 为了介绍Python包TopicContml用于遗传学分析.
  • 在各种数据集上评估新方法的性能和稳定性.

主要方法:

  • 开发了一种使用概率主题建模 (隐性迪里克莱特分配或LDA) 的无对齐的家族遗传推理方法.
  • 从k-mers中提取"话题"频率,这些频率来自于多位点DNA序列.
  • 整合了主题Contml与来自PHYLIP包的Contml程序,用于物种树的生成.
  • 采用了引导程序来评估估计的分类关系的不确定性.

主要成果:

  • 话题Contml在模拟数据集上展示了效率和统计稳定性,包括那些有空白的数据集.
  • 该方法成功地应用于三个不同的生物数据集:澳大利亚鸟类种群,哺乳动物种类和来自鸟类的PacBio序列.
  • 经验结果和模拟表明可靠的遗传学推断能力.

结论:

  • TopicContml为全基因组的遗传学推断提供了一种高效且在统计学上可靠的无对齐方法.
  • 该方法有效地处理多样化和复杂的生物序列数据,克服计算约束.
  • 这种工具通过使快速的进化历史重建成为可能,推进了植物遗传学领域.