在多基因选择下对等位基频率动态的途径整体方法
Nathan W Anderson1, Lloyd Kirk1, Joshua G Schraiber2
1Department of Integrative Biology, University of Wisconsin-Madison, Madison, WI, 53706, USA.
bioRxiv : the preprint server for biology
|June 25, 2024
概括
预测选择和漂移下的等位基因频率变化对于理解复杂的特征至关重要. 这项研究扩展了途径积分方法来分析多基因特征的选择,有助于进化和再序列实验.
科学领域:
- 进化遗传学的进化遗传学
- 定量遗传学 是一种定量遗传学.
- 人口遗传学 人口遗传学
背景情况:
- 许多表型特征是多基因的,使遗传架构研究和表型预测复杂化.
- 进化和再序列实验通过选择的等位基频率变化来确定特征位置.
- 在等位基因频率变化中区分选择与遗传漂移仍然具有挑战性,特别是在复杂的特征中.
研究的目的:
- 在定量遗传学中扩展路径积分方法来分析选择下的等位基因频率动态.
- 在稳定和适应性选择下,为等位基频率过渡概率推导分析表达式.
- 改进进化和再序列实验的设计和解释,以发现多基因架构.
主要方法:
- 扰动近似的应用,一种路径积分方法,用于定量遗传选择场景.
- 分析表达式的推导,用于等位基频率过渡概率.
- 使用衍生式来分析选择检测和优化实验设计.
主要成果:
- 开发了适用于复杂多基因特征的扩展路径整体框架.
- 在稳定和快速适应性选择下对等位基因的分析过渡概率.
- 为选择测试和实验设计提供了一种评估等位基因频率变化的方法.
结论:
- 延长路径积分方法为研究复杂特征的遗传基础提供了一个强大的工具.
- 衍生出来的表达式有助于解释进化和再序列实验.
- 这项工作增强了我们在选择下发现多基因特征遗传架构的能力.
相关概念视频
01:49Hardy-Weinberg Principle
72.1K
Diploid organisms have two alleles of each gene, one from each parent, in their somatic cells. Therefore, each individual contributes two alleles to the gene pool of the population. The gene pool of a population is the sum of every allele of all genes within that population and has some degree of variation. Genetic variation is typically expressed as a relative frequency, which is the percentage of the total population that has a given allele, genotype or phenotype.
72.1K
01:09Mutation, Gene Flow, and Genetic Drift
58.3K
In a population that is not at Hardy-Weinberg equilibrium, the frequency of alleles changes over time. Therefore, any deviations from the five conditions of Hardy-Weinberg equilibrium can alter the genetic variation of a given population. Conditions that change the genetic variability of a population include mutations, natural selection, non-random mating, gene flow, and genetic drift (small population size).
58.3K
01:21Frequency-dependent Selection
22.0K
When the fitness of a trait is influenced by how common it is (i.e., its frequency) relative to different traits within a population, this is referred to as frequency-dependent selection. Frequency-dependent selection may occur between species or within a single species. This type of selection can either be positive—with more common phenotypes having higher fitness—or negative, with rarer phenotypes conferring increased fitness.
22.0K
01:25What is Population Genetics?
57.9K
A population is composed of members of the same species that simultaneously live and interact in the same area. When individuals in a population breed, they pass down their genes to their offspring. Many of these genes are polymorphic, meaning that they occur in multiple variants. Such variations of a gene are referred to as alleles. The collective set of all the alleles within a population is known as the gene pool.
57.9K
03:33Genetic Drift
39.7K
Natural selection—probably the most well-known evolutionary mechanism—increases the prevalence of traits that enhance survival and reproduction. However, evolution does not merely propagate favorable traits, nor does it always benefit populations.
39.7K
02:39Gene Flow
35.0K
Gene flow is the transfer of genes among populations, resulting from either the dispersal of gametes or from the migration of individuals.
35.0K