相关实验视频
Updated: Jun 28, 2025

12:00
A Practical Guide to Phylogenetics for Nonexperts
Published on: February 5, 2014
35.3K
新型对称性保护神经网络模型用于遗传学推断
Xudong Tang1,2, Leonardo Zepeda-Nuñez3, Shengwen Yang1,2
1Wisconsin Institute for Discovery, University of Wisconsin-Madison, Madison, WI 53706, United States.
Bioinformatics advances
|April 19, 2024
概括
一个新的神经网络模型有效地解决了长分支吸引力 (LBA) 在基因推理中,优于现有的方法. 这种模型为重建生命之树提供了更高的准确性和可扩展性,这对于理解生物多样性演变至关重要.
科学领域:
- 进化生物学 进化生物学
- 计算生物学 计算生物学
- 生物信息学是一种生物信息学.
背景情况:
- 了解生命的进化历史依赖于遗传学推断,通常被视为生命之树.
- 长枝吸引力 (LBA) 是植物遗传学中的一个重大挑战,其中快速进化的血统被错误地分组,扭曲了进化关系.
- 现有的遗传学方法与LBA斗争,影响进化重建的准确性.
研究的目的:
- 开发一种新的计算方法,以克服长分支吸引力在遗传学推理中的局限性.
- 引入一种神经网络模型,能够准确地重建进化关系,即使有不同的血统.
- 为植物遗传学分析提供可扩展和存储效率高的解决方案.
主要方法:
- 一个新的神经网络架构被设计为专门解决长枝吸引所带来的挑战.
- 该模型结合了换不变函数,以自然处理树同态,提高计算效率.
- 使用模拟和实证数据,对标准的基因组学方法和其他神经网络方法进行了性能评估.
主要成果:
- 拟议的神经网络模型在长枝吸引条件下表现出优越的性能,相比于已建立的基因组学方法.
- 该模型在重建真正的进化关系方面取得了更高的准确性,减轻了LBA的影响.
- 使用顺序不变函数导致减少了内存需求,并提高了更大的家族遗传树的可扩展性.
结论:
- 新型神经网络模型代表了植物遗传学推断的重大进步,特别是对于受长分支吸引影响的数据集.
- 这种方法提供了一种更准确,更高效的计算方法来重建生命之树.
- 开源实现促进了进化生物学领域的更广泛采用和进一步发展.
相关概念视频
Evolutionary Relationships through Genome Comparisons
5.7K
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...
5.7K
Phylogeny
44.0K
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.
44.0K
Phylogenetic Trees
45.3K
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.
45.3K
Synteny and Evolution
3.3K
John H. Renwick first coined the term “synteny” in 1971, which refers to the genes present on the same chromosomes, even if they are not genetically linked. The species with common ancestry tend to show conserved syntenic regions. Therefore, the concept of synteny is nowadays used to describe the evolutionary relationship between species.
Around 80 million years ago, the human and mice lineages diverged from the common ancestor. During the course of evolution, the ancestral...
Around 80 million years ago, the human and mice lineages diverged from the common ancestor. During the course of evolution, the ancestral...
3.3K
Gene Evolution - Fast or Slow?
7.1K
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...
In contrast, regions which code...
7.1K
Neural Circuits
1.2K
Neural circuits and neuronal pools are two of the main structures found in the nervous system. Neural circuits are networks of neurons that work together to carry out a specific task or process. They consist of interconnected neurons and glial cells, which provide structural and metabolic support.
Neuronal pools are collections of nerve cells with similar functions and interact through chemical and electrical signals. These pools include both interneurons (the central neural circuit nodes that...
Neuronal pools are collections of nerve cells with similar functions and interact through chemical and electrical signals. These pools include both interneurons (the central neural circuit nodes that...
1.2K

