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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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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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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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A Practical Guide to Phylogenetics for Nonexperts
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植物基准:用于评估植物遗传程序的基准.

Sergey Spirin1,2, Andrey Sigorskikh3, Aleksei Efremov3

  • 1Belozersky Institute, Lomonosov Moscow State University, Moscow, Russia.

Molecular biology and evolution
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概括

PhyloBench提供了一个比较使用真实蛋白质序列的基因推理程序的基准. 距离方法,特别是平衡最小演变方法,在最大概率和最大储蓄性方面表现出卓越的准确性.

关键词:
一个基准的基准指标.遗传学上的推断.

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科学领域:

  • * 计算生物学 * 计算生物学
  • * 进化生物学 进化生物学
  • * 生物信息学是一门学科.

背景情况:

  • *从蛋白质序列的基因推断是至关重要的,但由于众多算法和参数而复杂.
  • * 缺乏对真实蛋白序列的标准基准,阻碍了客观的程序比较.
  • *评估遗传学方法需要强大的指标和数据集来进行准确的评估.

研究的目的:

  • * 开发和引入PhyloBench,这是一个评估遗传学推断质量的新基准.
  • * 通过使用天然蛋白质序列来评估流行的遗传学程序的性能.
  • * 为了确定蛋白质序列数据的最准确的遗传学方法.

主要方法:

  • *PhyloBench使用来自正统进化领域的自然蛋白质序列,而不是模拟数据.
  • *树的准确性是通过距离参考物种树的距离来衡量,罗宾逊-福尔兹距离证明是最可靠的.
  • * 评估了各种类遗传算法的性能,包括距离,最大概率,最大储蓄和贝叶斯方法.

主要成果:

  • * 基于距离的基因组学方法在自然蛋白质序列上表现优于最大概率和最大节.
  • * 在FastME中实施的平衡最小进化方法在测试方法中产生了最准确的结果.
  • *贝叶斯程序MrBayes的性能优于最大概率,但不如距离方法精确.

结论:

  • *PhyloBench为科学界提供了一个有价值的资源,用于评估遗传学推断工具.
  • *与ML和MP相比,距离方法代表了从蛋白质序列进行基因重建的更准确的方法.
  • * 建议使用平衡最小进化方法对蛋白质数据进行高精度的遗传学分析.