相关实验视频
Updated: Feb 2, 2026
07:27
A Drosophila Model to Study Wound-induced Polyploidization
Published on: June 9, 2020
5.9K
果西基因组的重复多化和可线棉纤维的演变
Andrew H Paterson1, Jonathan F Wendel, Heidrun Gundlach
1Plant Genome Mapping Laboratory, University of Georgia, Athens, Georgia 30602, USA.
Nature
|December 22, 2012
概括
棉花中的多重积分,涉及基因重复和基因组合并,显著增强纤维特征和遗传复杂性. 这种发生在数百万年前的多体进化,为植物适应和创新提供了洞察力.
科学领域:
- 植物基因组学与进化
- 多化和血管精子适应.
- 棉花纤维的发展
背景情况:
- 众所周知,多倍体,即整组染色体的增加,在植物中赋予了新的特征,例如四倍体棉花中改善了纤维生产.
- 了解这些新兴性质的遗传基础,需要对多倍体物种及其双倍体祖先进行详细的基因组分析.
研究的目的:
- 调查基因组事件,包括多重复合和多重复合,这些事件影响了精英棉花物种 (Gossypium hirsutum和Gossypium barbadense) 的进化.
- 阐明纤维进化和棉花中其他新出现的特性背后的遗传机制.
- 探索剖析其他多倍体精种的新兴性质的潜力.
主要方法:
- 对二倍体和四倍体Gossypium物种进行比较基因组学分析,包括G. herbaceum (A基因组),G. longicalyx (F基因组) 和G. raimondii (D基因组).
- 一种四平状棉花品种 (G. hirsutum A(t) D(t)) 的全基因组测序.
- 对DNA序列分歧,非互惠的DNA交换和基因表达模式的分析.
主要成果:
- 一个古老的五倍到六倍的积分增长 (大约60亿年前) 和一个最近的全聚积分事件 (大约1-2亿年前) 导致精英棉花中祖先的血管精子基因的30-36倍重复.
- 测序的G. hirsutum基因组揭示了其A和D亚基因组之间的广泛的非互惠DNA交换,有助于表型创新和适应.
- G. hirsutum的新奇性主要来自其新世界D基因组和旧世界A基因组祖先的等位基因的重组.
- 基因集群中的协调表达变化,包括核线粒体DNA块,与棉花纤维的定量特征位置相关.
结论:
- 多重积分是棉花遗传复杂性和新兴特性的主要驱动因素,具有显著的基因重复和亚基因组相互作用.
- 该研究为了解棉花纤维的进化和适应提供了一个框架,强调了基因组合并和随后的修改的作用.
- 这些发现为研究其他多倍体植物物种中出现的特征提供了有价值的见解.
相关概念视频
03:21Genome Size and the Evolution of New Genes
9.1K
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.
9.1K
03:21Genome Size and the Evolution of New Genes
3.4K
No description available
3.4K
02:02Genomics
40.7K
Genomics is the science of genomes: it is the study of all the genetic material of an organism. In humans, the genome consists of information carried in 23 pairs of chromosomes in the nucleus, as well as mitochondrial DNA. In genomics, both coding and non-coding DNA is sequenced and analyzed. Genomics allows a better understanding of all living things, their evolution, and their diversity. It has a myriad of uses: for example, to build phylogenetic trees, to improve productivity and...
40.7K
02:55The Evidence for Evolution
48.1K
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.
48.1K
01:54Convergent Evolution
32.9K
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.
32.9K
01:24Eukaryotic Evolution
41.4K
The endosymbiont theory is the most widely accepted theory of eukaryotic evolution; however, its progression is still somewhat debated. According to the nucleus-first hypothesis, the ancestral prokaryote first evolved a membrane to enclose DNA and form the nucleus. Conversely, the mitochondria-first hypothesis suggests that the nucleus was formed after endosymbiosis of mitochondria.
Contrary to the endosymbiont theory, the eukaryote-first hypothesis proposes that the simpler prokaryotic and...
Contrary to the endosymbiont theory, the eukaryote-first hypothesis proposes that the simpler prokaryotic and...
41.4K