Injection of endoplasm from large Xenopus oocytes which have undergone maturation into small (0.6-0.8 mm diameter) oocytes induces germinal vesicle (GV) breakdown. This process has been cytologically studied. Injection of cytoplasm from such small oocytes into large oocytes (1.0-1.2 mm diameter) is followed by the formation of a large spindle bearing many chromosomes at the site of injection.
Download full-text PDF |
Source |
|---|
Publication Analysis
Top Keywords
Similar Publications
Reproductive toxicity and transgenerational effects of co-exposure to polystyrene microplastics and arsenic in zebrafish.
Comp Biochem Physiol C Toxicol Pharmacol
January 2025
Department of Forensic Toxicology, School of Forensic Medicine, Southern Medical University, Guangzhou 510515, China; Guangzhou Key Laboratory of Forensic Multi-Omics for Precision Identification, School of Forensic Medicine, Southern Medical University, Guangzhou 510515, China. Electronic address:
Microplastics (MPs) are ubiquitous environmental pollutants that have garnered significant attention due to their small particle size, resistance to degradation and large specific surface area, which makes it easy to adsorb various pollutants, particularly heavy metals. Arsenic (As), a common metal poisons, poses significant risks due to its widespread industrial use. When MPs and As co-exist in the environment, they can exert combined toxic effects on organisms, affecting various systems, including the nervous system.
View Article and Find Full Text PDFPro-cumulin addition in a biphasic in vitro oocyte maturation system modulates human oocyte and cumulus cell transcriptomes.
Mol Hum Reprod
January 2025
Follicle Biology Laboratory, Research Group Genetics, Reproduction and Development, Vrije Universiteit Brussel (VUB), Brussels, Belgium.
Biphasic in vitro oocyte maturation (IVM) can be offered as a patient-friendly alternative to conventional ovarian stimulation in in vitro fertilization (IVF) patients predicted to be hyper-responsive to ovarian stimulation. However, cumulative live birth rates after IVM per cycle are lower than after conventional ovarian stimulation for IVF. In different animal species, supplementation of IVM media with oocyte-secreted factors (OSFs) improves oocyte developmental competence through the expression of pro-ovulatory genes in cumulus cells.
View Article and Find Full Text PDFPurpose: To investigate the effects of C-type natriuretic peptide (CNP) on human granulosa cell growth and elucidate its regulatory mechanisms.
Methods: A human non-luteinizing granulosa cell line (HGrC) developed from small antral follicles was used to assess the impact of CNP on cell proliferation and estrogen synthesis. cGMP production via the guanylate cyclase domain of the CNP receptor, natriuretic peptide receptor 2 (NPR2), was confirmed.
WDR74-Mediated Ribosome Biogenesis and Proteome Dynamics During Mouse Preimplantation Development.
Genes Cells
January 2025
Advanced Biological Information Research Division, INAMORI Frontier Research Center, Kyushu University, Fukuoka, Japan.
Preimplantation embryonic development is orchestrated by dynamic changes in the proteome and transcriptome, regulated by mechanisms such as maternal-to-zygotic transition. Here, we employed label-free quantitative proteomics to comprehensively analyze proteome dynamics from germinal vesicle oocytes to blastocysts in mouse embryos. We identified 3490 proteins, including 715 consistently detected across all stages, revealing stage-specific changes in proteins associated with translation, protein modification, and mitochondrial metabolism.
View Article and Find Full Text PDFThe interplay between mitochondrial DNA genotypes, female infertility, ovarian response, and mutagenesis in oocytes.
Hum Reprod Open
December 2024
Vrije Universiteit Brussel (VUB), Brussels Health Campus/Faculty of Medicine and Pharmacy, Research Group Genetics, Reproduction and Development , Laarbeeklaan 103, 1090 Brussels, Belgium.
Study Question: Is there an association between different mitochondrial DNA (mtDNA) genotypes and female infertility or ovarian response, and is the appearance of variants in the oocytes favored by medically assisted reproduction (MAR) techniques?
Summary Answer: Ovarian response was negatively associated with global non-synonymous protein-coding homoplasmic variants but positively associated with haplogroup K; the number of oocytes retrieved in a cycle correlates with the number of heteroplasmic variants in the oocytes, principally with variants located in the hypervariable (HV) region and rRNA loci, as well as non-synonymous protein-coding variants.
What Is Known Already: Several genes have been shown to be positively associated with infertility, and there is growing concern that MAR may facilitate the transmission of these harmful variants to offspring, thereby passing on infertility. The potential role of mtDNA variants in these two perspectives remains poorly understood.
Want AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!