在鸟类杂交区的大型祖先块上的可重复选择
Stephanie A Blain1,2, Hannah C Justen1, Quinn K Langdon3,4
1Biology Department, Texas A&M University, College Station, TX, USA.
Molecular biology and evolution
|February 24, 2025
概括
杂交区揭示了斯温森的亚种中的遗传不相容性. 染色体1和5上的选择和内进模式表明基因流动的障碍,由基因组结构和进化史塑造.
科学领域:
- 进化生物学 进化生物学
- 人口遗传学 人口遗传学
- 规格 规格 规格 规格
背景情况:
- 混合区作为研究物种之间的遗传不相容性的自然实验室.
- 斯温森的松鼠亚种是一个独特的案例,原因是不同的迁徙路线和混合迁徙失败,表明生态隔离.
研究的目的:
- 为了确定Swainson's thrush杂交区内选择中的基因位置和基因组区域.
- 研究内进的模式及其与遗传不相容性和进化史的关系.
主要方法:
- 利用一组祖先信息标记来分析四个混合种群的遗传变异.
- 检查了基因组基因和亚种祖先之间的过渡,以检测选择特征.
- 评估了基因组结构特征和重组率对选择和内进化的影响.
主要成果:
- 鉴定了1号和5号染色体上的两大遗传块,表现出针对不相容性的可重复选择模式.
- 在这些区块内观察到差异化的内向性模式,染色体1显示内陆亚种内向性,染色体5显示沿海亚种内向性.
- 发现基因组区域的重组组合较低,亚种差异化较高和积极选择经历了更强的选择和减少了内进.
结论:
- 位点之间的联系与分歧选择和先前的进化分歧相互作用,以加强生殖隔离.
- 基因组结构特征和进化历史在形成混合区内的选择和内进模式方面发挥着至关重要的作用.
- 生态不相容性,特别是与迁移相关的不相容性,对维持斯温森的松鼠杂交区做出了重大贡献.
相关概念视频
02:29Hybrid Zones
16.7K
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.
16.7K
01:31Formation of Species
38.9K
Speciation describes the formation of one or more new species from one or sometimes multiple original species. The resulting species are discrete from the parent species, and barriers to reproduction will typically exist. There are two primary mechanisms, speciation with and without geographic isolation—allopatric and sympatric speciation, respectively.
38.9K
01:46Types of Selection
40.0K
Natural selection influences the frequencies of particular alleles and phenotypes within populations in several different ways. Primarily, natural selection can be directional, stabilizing, or disruptive. Directional selection favors one extreme trait and shifts the population towards that phenotype while selecting against individuals displaying alternate traits. Stabilizing selection favors an intermediate trait with a narrow range of variation. Deviation from the optimal phenotype towards an...
40.0K
01:17What is a Species?
43.7K
Overview
43.7K
02:16Genetics of Speciation
18.9K
Speciation is the evolutionary process resulting in the formation of new, distinct species—groups of reproductively isolated populations.
18.9K
02:31Synteny and Evolution
3.2K
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...
3.2K