基因组进化的模式和过程是从十个最小的脊椎动物基因组推断出来的
Kaiqiang Liu1,2, Qian Wang1,2, Ning Wang3
1State Key Laboratory of Mariculture Biobreeding and Sustainable Goods, Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao, Shandong, 266071, China.
Advanced science (Weinheim, Baden-Wurttemberg, Germany)
|September 10, 2025
概括
气鱼的基因组是脊椎动物中最小的. 可转移元素抑制,而不是基因丢失,驱动它们的基因组紧缩,为基因组工程提供了洞察力.
科学领域:
- 基因组学就是基因组学.
- 进化生物学 进化生物学
- 进行比较基因组学.
背景情况:
- 鱼拥有最小的脊椎动物基因组,这使得它们成为研究基因组大小演变的关键模型.
- 以前的研究对Takifugu rubripes基因组进行了测序,但基因组大小的进化驱动因素仍然不清楚.
研究的目的:
- 阐明鱼极端脊椎动物基因组紧缩背后的基因组进化机制.
- 研究可移植元素,基因丢失和选择在鱼物种化和适应中的作用.
主要方法:
- 测序了10个气泡鱼基因组,35个转录组和13个甲基组.
- 进行比较基因组分析以确定基因组紧缩的驱动因素.
- 遗传学分析以解决物种关系并推断进化历史.
- 对关键功能途径的积极选择分析.
主要成果:
- 气球鱼的基因组紧缩主要是由可转移元素抑制驱动的,由减少的转移子相关酶和修改的DNA修复机制介导.
- 内向被确定为Takifugu niphobles和Takifugu oblongus的物种化的一个关键驱动因素.
- 长期关联的选择影响了其他塔基夫古物种的分歧.
- 积极选择对机械转导途径基因 (例如,整合素,离子通道) 和与皮肤图案和颜色相关的基因起作用,表明在反掠食者策略和快速物种化中的适应性作用.
结论:
- 可转移元素抑制是鱼极端脊椎动物基因组紧缩的主要机制.
- 与机械转导和色素化相关的特定遗传通路正在积极选择中,可能会推动适应和物种化.
- 这些发现为基因组进化提供了基本的见解,并对基因组工程有影响.
相关概念视频
02:54Evolutionary Relationships through Genome Comparisons
6.9K
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...
6.9K
03:21Genome Size and the Evolution of New Genes
3.3K
3.3K
03:21Genome Size and the Evolution of New Genes
9.0K
While every living organism has a genome of some kind (be it RNA, or DNA), there is considerable variation in the sizes of these blueprints. One major factor that impacts genome size is whether the organism is prokaryotic or eukaryotic. In prokaryotes, the genome contains little to no non-coding sequence, such that genes are tightly clustered in groups or operons sequentially along the chromosome. Conversely, the genes in eukaryotes are punctuated by long stretches of non-coding sequence.
9.0K
02:05Gene Evolution - Fast or Slow?
8.0K
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...
8.0K
02:05Gene Evolution - Fast or Slow?
3.4K
3.4K
02:55The Evidence for Evolution
47.6K
Genetic variations accumulating within populations over generations give rise to biological evolution. Evolutionary changes can result in the formation of novel varieties and entire new species. These changes are responsible for the diverse forms of life inhabiting the planet. The evidence for evolution suggests that all living organisms descended from common ancestors.
47.6K