马赛克三系二次接触塑造了达特斯的多样化基因组结果
Pia F Schwarz1, Trevor J Krabbenhoft1,2, Thomas J Near3,4
1Department of Biological Sciences, 109 Cooke Hall, University at Buffalo, Buffalo, NY 14260, USA.
Evolution; international journal of organic evolution
|December 22, 2025
概括
泰塞拉达特和约翰尼达特之间的二次接触创造了一个稳定的混合区. 根据流量大小划分区,尽管基因流和杂交正在进行,但仍然保持了物种身份.
科学领域:
- 进化生物学 进化生物学
- 遗传学 遗传学 是一个
- 鱼类学 鱼类学 鱼类学
背景情况:
- 品种化可能导致不完全的生殖隔离,导致具有基因流动的杂交区.
- 在淡水生态系统中改变河流流程可能会导致鱼类之间的二次接触和杂交.
- 由于河流的变化,在溪流系统中可能会发生碎片化的物种分布.
研究的目的:
- 调查位于纽约西部的Tessellated Darter (Etheostoma olmstedi) 和Johnny Darter (Etheostoma nigrum) 之间的二次接触区域.
- 使用多个分子数据集分析遗传结构和杂交模式.
- 了解淡水鱼类中二次接触和杂交的基因组结果.
主要方法:
- 双消化限制部位相关的DNA测序 (ddRADseq)
- 低覆盖范围的全基因组测序 (lcWGS)
- 线粒体DNA (mtDNA) 分析分析
主要成果:
- 确定了一个复杂的三系混合区,涉及E. olmstedi和两个不同的E. nigrum血统.
- lcWGS和ddRADseq都揭示了种群遗传结构,在估计种群差异化大小方面存在差异.
- 杂交发生在河流的交汇处,形成一个暂时稳定的马赛克,表明活跃和稳定的杂交状态.
- 接触区物种和种群的高水平的全基因组差异化在各个流中得到维持.
结论:
- 根据溪流大小划分的利基似乎保持了物种身份,尽管存在二次接触和杂交.
- 该研究强调了二次接触区的动态性质和杂交的多样化基因组后果.
- 这些发现提供了关于淡水鱼种群如何适应和保持在二次接触区域的特色的见解.
相关概念视频
Convergent Evolution
31.3K
Evolution shapes the features of organisms over time, ensuring that they are suited for the environments in which they live. Sometimes, selection pressure leads to the rise of similar but unrelated adaptations in organisms with no recent common ancestors, a process known as convergent evolution.
31.3K
Hybrid Zones
21.7K
Hybrid zones are narrow regions where two closely related species interact, mate, and produce hybrids. Relative to either parent species, hybrids may possess distinct phenotypic or genetic differences that impact their survival and reproductive success. The genetic variances introduced by hybridization influence species diversity and speciation processes within the hybrid zone.
21.7K
Gene Duplication and Divergence
7.8K
The seminal work of Ohno in 1970 popularized the idea of gene duplication and divergence. DNA sequence comparison studies reveal that a large portion of the genes in bacteria, archaebacteria, and eukaryotes was generated by gene duplication and divergence, indicating its critical role in evolution.
The duplicated copies of the gene are called Paralogs. Paralogs with similar sequences and functions form a gene family. Across several species, a large number of gene families are...
The duplicated copies of the gene are called Paralogs. Paralogs with similar sequences and functions form a gene family. Across several species, a large number of gene families are...
7.8K
Genetics of Speciation
20.8K
Speciation is the evolutionary process resulting in the formation of new, distinct species—groups of reproductively isolated populations.
20.8K
Position-effect Variegation
7.0K
In 1928, a German botanist Emil Heitz observed the moss nuclei with a DNA binding dye. He observed that while some chromatin regions decondense and spread out in the interphase nucleus, others do not. He termed them euchromatin and heterochromatin, respectively. He proposed that the heterochromatin regions reflect a functionally inactive state of the genome. It was later confirmed that heterochromatin is transcriptionally repressed, and euchromatin is transcriptionally active chromatin.
7.0K
Evolutionary Relationships through Genome Comparisons
6.8K
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...
6.8K


