Oocyte Nucleus Spread
Oocyte Nucleus Spread - Related Videos
12:10
Microinjection of Xenopus Laevis Oocytes
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Cited by 14 •
2009
Here we demonstrate cytoplasmic microinjection of Xenopus laevis oocytes with a nuclear import substrate, as well as preparation of the injected oocytes for visualization by thin-sectioning electron microscopy.
09:24
Preparation of Meiotic Chromosome Spreads from Mouse Oocytes for Assessment of Synapsis and Recombination
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Cited by 4 •
2025
Figure 1: End-to-end framework. The figure illustrates end-to-end framework for multimodal knowledge Graph VISHAM-KG. Please click here to view a larger version of this figure.
10:39
Chromatin Spread Preparations for the Analysis of Mouse Oocyte Progression from Prophase to Metaphase II
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Cited by 21 •
2018
Oogenesis in mammals is known to be error-prone, particularly due to chromosome missegregation. This manuscript describes chromatin spread preparation methods for mouse prophase, metaphase I and II-staged oocytes. These fundamental techniques allow for the study of chromatin-bound proteins and chromosome morphology throughout mammalian oogenesis.
10:07
Isolation of Giant Lampbrush Chromosomes from Living Oocytes of Frogs and Salamanders
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Cited by 12 •
2016
We present simple techniques for isolating giant transcriptionally active lampbrush chromosomes from living oocytes of frogs and salamanders. We describe how to observe these chromosomes "alive" by phase contrast or differential interference contrast, and how to fix them for fluorescent in situ hybridization or immunofluorescent staining.
07:03
Mouse Oocyte Microinjection, Maturation and Ploidy Assessment
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Cited by 75 •
2011
Oocytes are prone to aneuploidy due to errors in chromosome segregation during meiotic maturation. Aneuploid eggs can cause infertility, miscarriages or developmental disorders like Down syndrome. Here, we describe methods to introduce materials of choice into oocytes and methods to study meiotic maturation and assess ploidy.
FAQs
Disrupting the nuclear envelope removes the enclosure around the oocyte’s chromatin and allows the nuclear contents to disperse across a microscope slide. This arrangement separates chromosome material enough to examine its organization directly. Subsequent fixation helps preserve the spread structure, so chromosome pairing, synaptonemal complex features, and associated factors can be evaluated microscopically.
Investigators can assess how meiotic chromosomes pair and how the synaptonemal complex is organized between them. The preparation also supports examination of recombination-associated factors and visible meiotic abnormalities. Together, these features provide information about chromosome behavior during meiosis rather than only showing the overall condition of the oocyte nucleus.
Preserving chromosome-associated proteins adds molecular context to the chromosome arrangement visible on the slide. Staining or labeling can therefore reveal not only chromatin structure but also the distribution of factors connected with meiotic processes, including recombination. This combination helps relate chromosome morphology to the molecular organization of meiosis in genetic studies.
Pairing patterns and synaptonemal complex organization provide visible indicators of how homologous chromosomes interact during meiosis. Departures from expected organization can identify abnormalities in chromosome behavior or meiotic structure. Examining these features helps investigators connect cellular chromosome defects with broader genetic questions involving aneuploidy, fertility defects, and reproductive disease.
The preparation begins by disrupting the nuclear envelope, followed by dispersing the nuclear contents across a microscope slide. The spread is then fixed to preserve chromosome structure and associated proteins. Finally, the material is stained or labeled and examined by microscopy. Each stage supports a different requirement: release, arrangement, preservation, and visualization.
Fixation preserves the dispersed chromosome material and its associated proteins after the nuclear contents have been spread. Staining or labeling then makes selected structural or molecular features accessible for microscopic examination. Using these steps together allows researchers to inspect chromosome organization, meiotic pairing, synaptonemal complex features, and recombination-associated factors in the same preparation.
This technique is useful when researchers need a cellular view of chromosome behavior during oocyte meiosis. It can support investigations of chromosome pairing, recombination-related organization, and meiotic abnormalities. Those observations are relevant to studies of aneuploidy, fertility defects, and reproductive disease because they can connect visible chromosome behavior with potential genetic mechanisms.