The evolution and genetics of superorganisms

超有机体的进化和遗传学

• 批准号: RGPIN-2020-06168
• 负责人: Zayed, Amro
• 金额: $ 4.01万
• 依托单位: York University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2021
• 资助国家: 加拿大
• 起止时间: 2021-01-01 至 2022-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=741070
• 关键词: evolution; genetics; superorganisms

Evolution was punctuated by several major events that fundamentally increased the complexity and biodiversity of life. These evolutionary game-changers include the evolution of sex, multicellularity, and sociality. Sociality evolved multiple times in animals and involves division of labour between individuals that cooperate to benefit a group. In solitary species, genetic mutations can influence an individual's traits and these mutations can spread or decline as a function of the individual's fitness. Social animals, however, have collective `superorganismal' traits that are emergent properties of a complex system composed of thousands of genetically distinct individuals interacting together. The evolution and genetics of superorganismal traits are not well understood, in part because the typical tools for studying genetics in solitary organisms are not directly applicable to social animals. Armed with unique population and functional genomic datasets on the honey bee - a model organism for the study of social behaviour and its evolution - I will advance knowledge in sociogenomics by: 1) Evolution and genetics of superorganismal traits: We will integrate functional and quantitative genomic studies with population genomic surveys of positive and negative selection to test explicit hypotheses about the evolution of superorganismal traits in the honey bee. 2) Genetics and consequences of extreme polyandry: Extreme polyandry (multiple mating) is common in many social insects, but the genetics and fitness consequence of this heritable trait is not well understood. We will use genome wide association mapping to identify the genes underlying polyandry in honey bees. We will also directly test the hypothesis that within colony genetic diversity enhances division of labour and colony fitness. 3) The evolution of extreme recombination: A previous study suggested that rates of recombination in social insects tend to be much higher than in solitary insects. We will advance knowledge in this area by carrying out phylogenetically independent comparisons of recombination rates in several groups of social insects and their solitary ancestors, and ask if worker-biased genes tend to reside in recombination hotspots as we previously discovered in honey bees. Finally, we will theoretically evaluate different models for the evolution of hyper recombination rates in social insects. Impact: Our research will provide the first integrative effort to study the genetics and evolution of superorganisms and will also advance knowledge on two common but poorly understood features of eusocial insects: extreme polyandry and recombination. This will lay the foundation for understanding the ultimate and proximate causes of a major transition in biology. Finally, the research will create fertile grounds for a diverse group of trainees to make major research contributions while mastering cutting edge techniques in evolutionary genomics.

进化被几个重大事件打断，从根本上增加了生命的复杂性和生物多样性。这些改变进化游戏规则的因素包括性、多细胞性和社会性的进化。社会性在动物中经历了多次进化，涉及个体之间的劳动分工，这些个体合作以使群体受益。在孤独的物种中，基因突变可以影响个体的特征，这些突变可以作为个体适应性的函数传播或下降。然而，社会动物具有集体的“超有机体”特征，这些特征是由数千个遗传上不同的个体相互作用组成的复杂系统的新兴特性。 超生物性状的进化和遗传学还没有得到很好的理解，部分原因是研究独居生物遗传学的典型工具并不直接适用于社会动物。有了蜜蜂独特的种群和功能基因组数据集-一种研究社会行为及其进化的模式生物-我将通过以下方式推进社会基因组学知识：1）超生物性状的进化和遗传学：我们将整合功能和定量基因组研究与人口基因组调查的积极和消极的选择，以测试明确的假设进化的超级生物性状，蜜蜂 2)极端一妻多夫的遗传学和后果：极端一妻多夫（多次交配）在许多社会昆虫中很常见，但这种遗传特征的遗传学和适应性后果尚不清楚。我们将使用全基因组关联图谱来确定蜜蜂中一妻多夫的基因。我们还将直接测试的假设，在殖民地内的遗传多样性增强分工和殖民地健身。 3)极端重组的进化：以前的一项研究表明，社会昆虫的重组率往往比独居昆虫高得多。我们将通过对几组社会昆虫及其孤独祖先的重组率进行遗传学上独立的比较来推进这一领域的知识，并询问工人偏向的基因是否倾向于驻留在重组热点中，就像我们以前在蜜蜂中发现的那样。最后，我们将从理论上评估不同的模型进化的超重组率在社会昆虫。 影响：我们的研究将提供第一个综合性的努力来研究超有机体的遗传和进化，也将推进对真社会性昆虫的两个常见但知之甚少的特征的认识：极端一妻多夫制和重组。这将为理解生物学重大转变的最终和近因奠定基础。最后，这项研究将为多样化的学员群体创造肥沃的土壤，使他们在掌握进化基因组学尖端技术的同时做出重大研究贡献。