How constrained is evolution? The importance of genetic redundancy in local adaptation

进化受到多大的限制？

• 批准号: RGPIN-2017-03950
• 负责人: Yeaman, Samuel
• 金额: $ 2.4万
• 依托单位: University of Calgary
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2017
• 资助国家: 加拿大
• 起止时间: 2017-01-01 至 2018-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=631707
• 关键词: How; constrained; evolution; importance; genetic

Adaptation is central to evolution, but we are only beginning to answer fundamental questions about how it works: How commonly do species adapt to the same kind of environment in different ways? Why does this occur? What maintains the capacity of a species to adapt to changes in its environment? My research program uses computational approaches to explore how genetics can affect the outcome of evolution, and then seeks to test hypotheses that arise from this work using empirical datasets to answer these fundamental questions. In particular, my research program explores how populations adapt to heterogeneous environments, in which fitness trade-offs often prevent one phenotype from being optimal in all possible conditions. In such cases, the tension between divergent natural selection, migration, and recombination can greatly alter the genetic architecture that evolves: in some conditions, architectures tend to be characterized by fewer, larger, and more tightly clustered alleles, whereas in other conditions, they tend to be characterized by many small alleles distributed throughout the genome. This interplay between ecology and genetics can greatly affect the predicted outcome and repeatability of evolution, as well as the evolvability of a species.

适应是进化的核心，但我们才刚刚开始回答关于它如何工作的基本问题：物种以不同的方式适应同一种环境的普遍程度如何？为什么会发生这种情况？是什么维持了一个物种适应环境变化的能力？我的研究项目使用计算方法来探索遗传学如何影响进化的结果，然后试图使用经验数据集来测试这项工作中产生的假设，以回答这些基本问题。特别是，我的研究项目探讨了人口如何适应异质环境，在这种环境中，健身权衡往往会阻止一个表型在所有可能的条件下都是最佳的。在这种情况下，不同的自然选择，迁移和重组之间的张力可以大大改变进化的遗传结构：在某些情况下，结构往往以更少，更大，更紧密地聚集的等位基因为特征，而在其他条件下，它们往往以分布在整个基因组中的许多小等位基因为特征。生态学和遗传学之间的这种相互作用可以极大地影响进化的预测结果和可重复性，以及物种的可进化性。