基于全基因组再测序的Schizothorax o'connori的种群结构和适应性分析
Kuo Gao1, Zhi He1, Jinxin Xiong1
1College of Animal Science and Technology, Sichuan Agricultural University, Chengdu, China.
BMC genomics
|February 6, 2024
概括
Schizothorax o'connori种群的遗传多样性较低,没有显著的差异化,受到高原升高和冰河时代的影响. 适应性基因与DNA修复和能量代谢有关,用于高海拔生存.
科学领域:
- 基因组学就是基因组学.
- 进化生物学 进化生物学
- 鱼类学 鱼类学 鱼类学
背景情况:
- Schizothorax o'connori,是中国隆博河的特有物种,是研究青海-西藏高原鱼类适应的一个模型.
- 以前的全基因组重复事件和高原升级已经塑造了鱼类的基因交换和种群差异化.
- 全基因组再测序对于理解鱼类的遗传基础和环境适应机制至关重要.
研究的目的:
- 通过全基因组再测序来研究Schizothorax o'connori的种群结构.
- 确定S. o'connori.环境适应的适应性特征和遗传基础.
主要方法:
- 在七个Schizothorax o'connori种群的全基因组重新排序.
- 单核酸多态 (SNP) 的识别和分析.
- 人口结构和历史动态分析.
主要成果:
- 确定了23,602,746个SNP,主要位于2号和23号染色体上.
- 发现基因多样性较低,种群之间没有显著的遗传差异化,尽管Zangga种群显示出一些分离.
- 人口规模受到青海-西藏高原升起和第四个冰河时代的影响.
结论:
- 全基因组再测序揭示了S. o'connori在Yarlung Zangbo河对岸的有限遗传差异化.
- 人口模式和多样性是由地质和气候事件塑造的,例如高原升高和冰河时代.
- 精选的基因在DNA修复和能量代谢途径中得到丰富,促进了适应高海拔条件.
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
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
Conservation of Small Populations
13.1K
Small population sizes put a species at extreme risk of extinction due to a lack of variation, and a consequent decrease in adaptability. This weakens the chances of survival under pressures such as climate change, competition from other species, or new diseases. Large populations are more likely to survive pressures such as these, as such populations are more likely to harbor individuals that have genetic variants that are adaptive under new stresses. Small populations are much less...
13.1K
Gene Duplication and Divergence
6.1K
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...
6.1K
Next-generation Sequencing
88.8K
The first human genome sequencing project cost $2.7 billion and was declared complete in 2003, after 15 years of international cooperation and collaboration between several research teams and funding agencies. Today, with the advent of next-generation sequencing technologies, the cost and time of sequencing a human genome have dropped over 100 fold.
Next-Generation Sequencing Methods
Although all next-generation methods use different technologies, they all share a set of standard features....
Next-Generation Sequencing Methods
Although all next-generation methods use different technologies, they all share a set of standard features....
88.8K


