Germ Cell Development and Oocyte Maturation in Vertebrates
Summary
Germ cell development in vertebrates begins with the specification of primordial germ cells in the early embryo, followed by their migration to the developing gonad. Within the gonadal environment, these cells proliferate by mitosis before entering meiosis to form oocytes. Oocyte maturation encompasses both nuclear and cytoplasmic events: chromosomal reduction, germinal vesicle breakdown, organelle redistribution and accumulation of maternal RNAs and proteins. Folliculogenesis provides the somatic environment for oocyte growth, regulated by endocrine signals such as follicle-stimulating hormone and luteinising hormone. Vitellogenesis or yolk deposition supplies nutrients for embryogenesis in oviparous species, while in mammals cumulus–oocyte complex interactions ensure developmental competence. Temporal coordination of these processes is essential for fertility, with perturbations leading to disorders such as premature ovarian failure or impaired fecundity. Advances in molecular profiling and live imaging have revealed conserved pathways across fish, amphibians, reptiles, birds and mammals, highlighting both species-specific adaptations and fundamental mechanisms of gamete quality control.
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Germ Cell Development and Oocyte Maturation in Vertebrates publication trend
The graph below shows the total number of articles in germ cell development and oocyte maturation in vertebrates across all publications each year (not limited to Nature Index journals).
Technical terms
Primordial germ cells (PGCs): Embryonic precursors of sperm and eggs that migrate to and colonise the gonads.
Meiosis: Specialized cell division reducing chromosome number by half, producing haploid gametes.
Folliculogenesis: Sequential development of ovarian follicles from primordial to preovulatory stages under endocrine control.
Vitellogenesis: Yolk deposition process in oviparous oocytes, supplying nutrients for early embryo development.
Germinal vesicle breakdown (GVBD): Dissolution of the oocyte nucleus envelope, marking resumption of meiosis.
Follicle-stimulating hormone (FSH): Pituitary gonadotropin that promotes follicle growth, estrogen production and meiotic progression in oocytes.
References
- The Synchronized Progression from Mitosis to Meiosis in Female Primordial Germ Cells between Layers and Broilers. Genes (2023).
- The effects of endogenous FSH and its receptor on oogenesis and folliculogenesis in female Alligator sinensis. BMC Zoology (2023).
- Ultrastructural Characterization of Porcine Growing and In Vitro Matured Oocytes. Animals (2020).
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