使用基因组尺度数据解决类鱼 (Siluriformes:Ailiidae) 的分类学不确定性
Jash Hang Limbu1, Dipak Rajbanshi1, Jiantao Hu2
1College of Fisheries and Life Science, Shanghai Ocean University, Shanghai 201306, China; Biological Research and Conservation Center (BRCC), Damak, Jhapa, Koshi Province 56600, Nepal.
Molecular phylogenetics and evolution
|June 3, 2025
概括
这项研究通过基因组数据澄清了亚洲淡水鱼 (Ailiidae) 的进化历史和分类学. 发现证实了属单一性,重新分类物种,并确切地指出甘河-布拉马普特拉盆地是起源,分散受到地质事件的影响.
科学领域:
- 鱼类学和进化生物学
- 分子遗传学和基因组学
- 生物地理和保护
背景情况:
- 南亚和东南亚的淡水鱼家族Ailiidae表现出复杂的进化关系和分类学不确定性.
- 之前在Ailiidae中的分类一直存在争议,需要一个强大的家族遗传框架来准确理解.
研究的目的:
- 解决分类学上的不确定性,并使用全面的家族基因组数据阐明艾利科家族内的进化关系.
- 建立关键的属和物种的遗传学位置,包括根据分子和形态学证据重新分类类型.
- 为了重建Ailiidae的分歧时间和生物地理历史,识别起源和分散模式.
主要方法:
- 对来自11个艾利科动物物种和两个外群类型的29个标本进行了基因组分析.
- 利用混合化目标丰富和高通量测序来获得4434个单复制核编码位点.
- 在严格的数据过后,对2,102个位点 (505,110个位点) 进行了家族遗传学分析,以寻找缺失的种类.
主要成果:
- 在所有研究的属中 (Ailia,Ailiichthys,Clupisoma,Eutropiichthys,Silonia,Laides) 已确认为单基,Clupisoma montanum和C. sinense被重新分类为Laides.
- 确定了Ailia coila和Ailiichthys punctata作为一个早期分离的分类,是剩余Ailiidae的姐妹.
- 差异约会估计Ailiidae的共同祖先在210万年前 (普莱斯托时代);生物地理重建表明甘河-布拉马普特拉河流域是起源,随后有分散事件.
结论:
- 这项研究为Ailiidae提供了一个强大的家族遗传框架,解决了长期存在的分类学问题,并证实了Eutropiichthys和Silonia的独特血统.
- 普莱斯托时代的气候波动,构造活动和海平面的变化显著影响了艾利科动物在南亚和东南亚河流盆地的分散和多样化.
- 古河与河流的连接在促进寄生和分散事件方面发挥了关键作用,推动了这些淡水鱼的进化辐射.
相关概念视频
Evolutionary Relationships through Genome Comparisons
6.2K
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...
6.2K
Modern Molecular Taxonomy
159
Advancements in molecular biology have revolutionized the identification and characterization of bacteria, with multiple methods leveraging DNA sequencing for enhanced precision. As sequencing technologies improve and costs decline, these approaches are increasingly used in clinical, environmental, and evolutionary studies.Multilocus Sequence Typing (MLST) examines several housekeeping genes, essential chromosomal genes encoding cellular functions, to distinguish strains. Approximately...
159
Gene Evolution - Fast or Slow?
7.5K
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...
7.5K
Applications of Molecular Taxonomy
122
Molecular taxonomy has revolutionized the understanding and classification of bacteria, providing precise insights into their diversity, evolutionary relationships, and ecological roles. By utilizing molecular techniques such as DNA sequencing and fingerprinting, researchers have made significant strides in various fields related to bacterial studies.Resolving Taxonomic AmbiguitiesMolecular taxonomy has been instrumental in distinguishing closely related bacterial species initially thought to...
122


