在高精子中构建祖先染色体和在比较基因组分析中的应用
Haoran Liao1, Lianghui Zhong1, Yujie He1
1State Key Laboratory of Tree Genetics and Breeding, Co-Innovation Center for Sustainable Forestry in Southern China, Key Laboratory of Forest Genetics and Biotechnology of Ministry of Education, Nanjing Forestry University, Nanjing 210037, China.
Plants (Basel, Switzerland)
|August 14, 2025
概括
这项研究重建了祖先的体精子型 (AGK),揭示了体精子进化过程中显著的染色体数稳定性. 分析突出了有偏见的重复模式和可转移元素分布,为植物基因组进化提供了洞察力.
科学领域:
- 植物进化生物学 植物进化生物学
- 基因组学就是基因组学.
- 古植物学是古植物学.
背景情况:
- 染色体重组会影响植物的进化,适应和基因功能.
- 作为古老的植物,体育种类为早期的陆地植物提供了洞察力.
- 了解祖先的型是解读体育种的进化历史的关键.
研究的目的:
- 为了推断祖先的体育精子型 (AGK).
- 为了分析AGK和现存的精子体基因组之间的对线性.
- 为了研究染色体进化和转移性元素分布在高精子.
主要方法:
- 型重建和祖先体育种型 (AGK) 推断.
- 对线性分析比较AGK与体和血管的基因组.
- 可转移的元素分析,特别是Welwitschia mirabilis*中的LINE-1逆转移.
主要成果:
- 推断的AGK由12个染色体组成,这表明在体的进化过程中染色体数的稳定性显著.
- 网状植物与AGK呈现微弱的对线性,具有偏向的保留复制块.
- LINE-1逆转移子被丰富了Welwitschia mirabilis的合成块;AGK-angiosperm合成显示了偏差分布.
结论:
- 精子种的染色体数量在进化上是稳定的,除了带状植物的例外,它们显示出不同的模式.
- 偏差重复和可转移的元素分布有助于体种的染色体进化.
- 这项研究为进一步研究高精子染色体进化提供了基础资源.
相关概念视频
Evolutionary Relationships through Genome Comparisons
6.1K
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...
6.1K
Lampbrush Chromosomes
8.0K
In 1882, Flemming observed lampbrush chromosomes (LBC) in salamander eggs. Later in 1892, Rückert observed LBCs in shark egg cells and coined the term "lampbrush chromosomes" because they looked like brushes used to clean kerosene lamps.
LBCs are made up of two pairs of conjugating homologous chromatids. Each chromatid consists of alternatively positioned regions of condensed-inactive chromatin and loosely placed-active side loops, which can be contracted and extended. The loops...
LBCs are made up of two pairs of conjugating homologous chromatids. Each chromatid consists of alternatively positioned regions of condensed-inactive chromatin and loosely placed-active side loops, which can be contracted and extended. The loops...
8.0K
Polytene Chromosomes
10.2K
Polytene chromosomes are giant interphase chromosomes with several DNA strands placed side by side. They were discovered in the year 1881 by Balbiani in salivary glands, intestine, muscles, malpighian tubules, and hypoderm of larvae Chironomus plumosus. Hence, these are also called "Salivary gland chromosomes." These are found in insects of the order Diptera and Collembola; in certain organs of mammals; and synergids, antipodes of flowering plants. Polytene chromosomes are also...
10.2K
Synteny and Evolution
3.4K
John H. Renwick first coined the term “synteny” in 1971, which refers to the genes present on the same chromosomes, even if they are not genetically linked. The species with common ancestry tend to show conserved syntenic regions. Therefore, the concept of synteny is nowadays used to describe the evolutionary relationship between species.
Around 80 million years ago, the human and mice lineages diverged from the common ancestor. During the course of evolution, the ancestral...
Around 80 million years ago, the human and mice lineages diverged from the common ancestor. During the course of evolution, the ancestral...
3.4K
Karyotyping
62.4K
Overview
62.4K
Crossing Over
147.9K
Unlike mitosis, meiosis aims for genetic diversity in its creation of haploid gametes. Dividing germ cells first begin this process in prophase I, where each chromosome—replicated in S phase—is now composed of two sister chromatids (identical copies) joined centrally.
The homologous pairs of sister chromosomes—one from the maternal and one from the paternal genome—then begin to align alongside each other lengthwise, matching corresponding DNA positions in a process...
The homologous pairs of sister chromosomes—one from the maternal and one from the paternal genome—then begin to align alongside each other lengthwise, matching corresponding DNA positions in a process...
147.9K


