Research progress in the regulatory mechanism of insect oogenesis

Oogenesis serves as a critical component in the reproductive cycle of insects, ensuring not only the perpetuation of species and the transmission of genetic information but also playing a significant role in the adaptive evolution and the establishment of social structures within insect populations. This article outlines the regulatory mechanisms of oogenesis, encompassing morphological transformations, functional implications, and a multitude of influencing factors. Morphologically, oogenesis entails a continuous developmental process from primordial germ cells to mature oocytes, which varies among different insect species. Influencing factors include the diversity of hormonal regulatory mechanisms, the nuanced control of reproductive processes by environmental and nutritional factors, and the roles of non-hormonal elements such as MicroRNAs, transcription factors, immune signals, and microbial metabolism in oogenesis. Endocrine hormones, particularly juvenile hormone and ecdysteroids, exert a central influence on oogenesis by modulating key stages such as germline stem cell self-renewal, oocyte maturation, and nutrient provision. The mechanisms of action of these hormones differ across species, reflecting the diversity in insect reproductive regulation. Beyond hormonal control, environmental and nutritional factors also impact oogenesis by affecting the endocrine or nervous systems. External conditions like climate change and nutritional status can alter reproductive strategies in insects, thereby influencing the adaptability and survival of populations. Additionally, MicroRNAs and transcription factors play pivotal roles in the regulation of gene expression and cell fate determination, while the interplay between immune signaling and microbial metabolism with oogenesis is gaining research interest. Consequently, this article aims to provide a comprehensive perspective for understanding the intricate regulatory network of insect oogenesis and points toward potential directions for future research.