ArticleBiology of reproduction2021
Cytoplasmic maturation in human oocytes: an ultrastructural study †.
Article in Biology of reproduction, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 40 papers.
What it found
Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.
The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.
Who cites it
40 citing papers in PubMed.
- Effect of Anti-Müllerian Hormone on Oocytes In Vitro Maturation in Sheep.International journal of molecular sciences · 2026Article
- The proteostatic landscape of healthy human oocytes.The EMBO journal · 2025Article
- Role of Granulosa Cell Dysfunction in Women Infertility Associated with Polycystic Ovary Syndrome and Obesity.Biomolecules · 2025Review
- Article
- The kinetics of nucleolar precursor bodies clustering at the pronuclei interface: Positive correlations with the morphokinetic characteristics of cleaving embryos and euploidy in preimplantation genetic testing programs.Clinical and experimental reproductive medicine · 2025Article
- Age-related changes in the cytoplasmic ultrastructure of feline oocytes.Scientific reports · 2025Article
- Transcriptional insights on the incomplete cytoplasmic maturation and developmental potential of oocytes cultured without granulosa cells in mice.BMC genomics · 2025Article
- B cell translocation gene 2 expression levels in human granulosa cells is negatively associated with in vitro fertilization/intracytoplasmic sperm injection outcomes: a pilot study.Journal of assisted reproduction and genetics · 2025Article
- Phenogenetics of cortical granule dynamics during zebrafish oocyte-to-embryo transition.Frontiers in cell and developmental biology · 2025Review
- Electron Microscopy of Human Oocytes.Methods in molecular biology (Clifton, N.J.) · 2025Article
- The Mammalian Oocyte: A Central Hub for Cellular Reprogramming and Stemness.Stem cells and cloning : advances and applications · 2025Review
- Vitamins, Coenzyme Q10, and Antioxidant Strategies to Improve Oocyte Quality in Women with Gynecological Cancers: A Comprehensive Review.Antioxidants (Basel, Switzerland) · 2024Review
- The multifaceted role of mitochondria in cardiac function: insights and approaches.Cell communication and signaling : CCS · 2024Review
- Mitonuclear compatibility is maintained despite relaxed selection on male mitochondrial DNA in bivalves with doubly uniparental inheritance.Evolution; international journal of organic evolution · 2024Article
- Stereological study of organelle distribution in human mature oocytes.Scientific reports · 2024Article
- Cumulus cell DNA damage linked to fertilization success in females with an ovulatory dysfunction phenotype.Frontiers in cell and developmental biology · 2024Article
- Article
- Regulation of Oocyte mRNA Metabolism: A Key Determinant of Oocyte Developmental Competence.Advances in anatomy, embryology, and cell biology · 2024Review
- C-Type Natriuretic Peptide Pre-Treatment Improves Maturation Rate of Goat Oocytes by Maintaining Transzonal Projections, Spindle Morphology, and Mitochondrial Function.Animals : an open access journal from MDPI · 2023Article
- Follicular fluid C3a-peptide promotes oocyte maturation through F-actin aggregation.BMC biology · 2023Article
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
6 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
Female fertility relies on successful egg development. Besides chromosome segregation, complex structural and biochemical changes in the cytoplasmic compartment are necessary to confer the female gamete the capacity to undergo normal fertilization and sustain embryonic development. Despite the profound impact on egg quality, morphological bases of cytoplasmic maturation remain largely unknown. Here, we report our findings from the ultrastructural analysis of 69 unfertilized human oocytes from 34 young and healthy egg donors. By comparison of samples fixed at three consecutive developmental stages, we explored how ooplasmic architecture changes during meiotic maturation in vitro. The morphometric image analysis supported observation that the major reorganization of cytoplasm occurs before polar body extrusion. The organelles initially concentrated around prophase nucleus were repositioned toward the periphery and evenly distributed throughout the ooplasm. As maturation progressed, distinct secretory apparatus appeared to transform into cortical granules that clustered underneath the oocyte's surface. The most prominent feature was the gradual formation of heterologous complexes composed of variable elements of endoplasmic reticulum and multiple mitochondria with primitive morphology. Based on the generated image dataset, we proposed a morphological map of cytoplasmic maturation, which may serve as a reference for future comparative studies. In conclusion, this work improves our understanding of human oocyte morphology, cytoplasmic maturation, and intracellular factors defining human egg quality. Although this analysis involved spare oocytes completing development in vitro, it provides essential insight into the enigmatic process by which human egg progenitors prepare for fertilization.
Indexed as
Identifiers
What OpenQuestion holds
Registered trials
Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.