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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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Model Approaches for Pharmacokinetic Data: Distributed Parameter Models01:06

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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 - Bacteria, Archaea, Eukaryotes02:40

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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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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 Khodaei, Scott V Edwards, Peter Beerli

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    概括
    此摘要是机器生成的。

    本研究介绍了 Topic Contml,这是一种使用全基因组数据推断进化史的无对齐方法. 它有效地从DNA序列生成物种树,克服了植物遗传学中的计算限制.

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    科学领域:

    • 基因组学就是基因组学.
    • 计算生物学 计算生物学
    • 进化生物学 进化生物学

    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.
    • 计算的局限性阻碍了从大型基因组数据集中快速准确地推断遗传学推断.
    • 现有的方法通常需要序列对齐,这可能是一个瓶.

    研究的目的:

    • 开发和评估一种无对齐的计算方法,用于推断全基因组的基因系.
    • 为了解决重建进化关系的计算约束.
    • 为植物遗传学分析提供一个强大而高效的工具.

    主要方法:

    • 开发了一种使用概率主题建模 (隐性狄里克莱特分配) 的无对齐的家族遗传推断方法.
    • 从k-mers中提取"话题"频率,这些频率来自于多位点DNA序列.
    • 将该方法集成到Python包主题Contml中,使用Contml (PHYLIP) 来生成物种树.

    主要成果:

    • 主题Contml在模拟和经验数据集上展示了效率和统计稳定性.
    • 从各种数据中成功推断出族系,包括澳大利亚鸟类,哺乳动物和PacBio序列.
    • 该方法有效地处理差距和未对齐的序列.

    结论:

    • 话题Contml为全基因组的遗传学推断提供了一个计算效率高,统计学上稳健的解决方案.
    • 无对齐方法克服了传统方法的局限性.
    • 该方法为跨不同种类的进化研究提供了有价值的工具.