Graduate School of Science and Engineering, Chiba University, Chiba, Japan.
Graduate School of Science, Chiba University, Chiba, Japan.
Biol Lett. 2021 Jul;17(7):20210194. doi: 10.1098/rsbl.2021.0194. Epub 2021 Jul 28.
Intrapopulation variation in behaviour, including activity, boldness and aggressiveness, is becoming more widely recognized and is hypothesized to substantially affect ecological and evolutionary dynamics. Although previous studies used candidate-gene approaches and genome-wide association analyses to identify genes correlated with variations in activity and aggressiveness, behavioural variation may not be fully captured in the nuclear genome, as it does not account for mitochondrial genomes. Mitochondrial genes encode products that are key regulators of the cellular energy-producing pathways in metabolic processes and are thought to play a significant role in life-history and reproductive traits. In this study, we considered many isofemale lines of established from two wild populations to investigate whether intrapopulation variation in the mitochondrial genome affected activity level within this species. We identified two major haplogroups in these populations, and activity levels in both larvae and adults differed significantly between the two haplogroups. This result indicated that intrapopulation variation in activity level may be partially controlled by mitochondrial genes, along with the interaction between nuclear and mitochondrial genes and the age of individual organisms.
种群内行为变异（包括活动、大胆和攻击性）正日益受到广泛认可，并被假设对生态和进化动态产生重大影响。尽管先前的研究使用候选基因方法和全基因组关联分析来识别与活动和攻击性变化相关的基因，但行为变异可能无法完全体现在核基因组中，因为它没有考虑到线粒体基因组。线粒体基因编码的产物是代谢过程中细胞能量产生途径的关键调节剂，被认为在生活史和生殖特征中发挥重要作用。在这项研究中，我们考虑了从两个野生种群中建立的许多同系雌株系，以研究线粒体基因组的种群内变异是否影响了该物种的活动水平。我们在这些种群中确定了两个主要的单倍群，幼虫和成虫的活动水平在这两个单倍群之间存在显著差异。这一结果表明，活动水平的种群内变异可能部分受到线粒体基因的控制，同时还受到核基因和线粒体基因之间的相互作用以及个体生物年龄的影响。
