Seong Ki-Hyeon, Uemura Tadashi, Kang Siu
Department of Liberal Arts and Human Development, Kanagawa University of Human Services, 1-10-1 Heiseicho, Yokosuka, Kanagawa 238-8522, Japan.
Japan Agency for Medical Research and Development (AMED)-CREST, AMED, 1-7-1 Otemachi, Chiyoda-ku, Tokyo 100-0004, Japan.
iScience. 2023 Jul 28;26(9):107502. doi: 10.1016/j.isci.2023.107502. eCollection 2023 Sep 15.
Animals achieve their first mating through the process of sexual maturation. This study examined the precise and detailed timing of a series of behavioral events, including wing expansion, first feeding, first excretion, and courtship, during sexual maturation from eclosion to first mating in . We found that the time of first mating is genetically invariant and is not affected by light/dark cycle or food intake after eclosion. We also found sexual dimorphism in locomotor activity after eclosion, with females increasing locomotor activity earlier than males. In addition, we found a time rapidly changing from extremely low to high sexual activity in males post eclosion (named "drastic male courtship arousal" or DMCA). These behavioral traits leading up to the first mating could serve as clear indicators of sexual maturation and establish precisely timed developmental landmarks to explore further the mechanisms underlying the integration of behavioral and physiological sexual maturation.
动物通过性成熟过程实现首次交配。本研究考察了从羽化到首次交配的性成熟过程中一系列行为事件的精确和详细时间安排，包括翅展开、首次进食、首次排泄和求偶。我们发现首次交配的时间在遗传上是不变的，且不受羽化后的光/暗周期或食物摄入的影响。我们还发现羽化后运动活动存在性别二态性，雌性比雄性更早增加运动活动。此外，我们发现雄性羽化后有一个从极低到高性活动迅速变化的时期（称为“剧烈雄性求偶唤醒”或DMCA）。这些导致首次交配的行为特征可作为性成熟的明确指标，并建立精确计时的发育里程碑，以进一步探索行为和生理性成熟整合背后的机制。
