Prometaphase I
Prometaphase I - Related Videos
09:11
Techniques for Imaging Prometaphase and Metaphase of Meiosis I in Fixed Drosophila Oocytes
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Cited by 20 •
2016
We present protocols for the collection, preparation, and imaging of mature Drosophila oocytes. These methods allow the visualization of chromosome behavior and spindle assembly and function during meiosis.
12:46
Using Fluorescence In Situ Hybridization (FISH) to Monitor the State of Arm Cohesion in Prometaphase and Metaphase I Drosophila Oocytes
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Cited by 7 •
2017
This manuscript presents a detailed method for generating X-chromosome arm probes and performing fluorescence in situ hybridization (FISH) to examine the state of sister chromatid cohesion in prometaphase and metaphase I arrested Drosophila oocytes. This protocol is suitable for determining whether meiotic arm cohesion is intact or disrupted in different genotypes.
04:56
Detection of Aggregation-Prone Behavior in Mutant P53 V157F Breast Cancer Cells Using Multipoint Thioflavin T Fluorescence
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2025
Hs578T breast cancer cells harboring the p53 V157F mutation exhibit significantly higher Thioflavin T fluorescence compared to MCF7 cells, indicating enhanced protein aggregation. Multipoint fluorescence measurements improve detection accuracy and reliability in identifying β-sheet-rich aggregates, underscoring the importance of aggregation-prone p53 mutations in cancer research and the development of therapeutic strategies.
02:03
Mitosis and Cytokinesis
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2019
In eukaryotes, the cell division cycle is divided into distinct, coordinated cellular processes that include cell growth, DNA replication/chromosome duplication, chromosome distribution to daughter cells, and finally, cell division. The cell cycle is tightly regulated by its regulatory systems as well as extracellular signals that affect cell proliferation. The processes of the cell cycle occur over approximately 24 hours (in typical human cells) and in two major distinguishable stages. The...
09:57
Live Cell Imaging of Mitosis
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2023
Mitosis is a form of cell division in which a cell’s genetic material is divided equally between two daughter cells. Mitosis can be broken down into six phases, during each of which the cell’s components, such as its chromosomes, show visually distinct characteristics. Advances in fluorescence live cell imaging have allowed scientists to study this process in great detail, providing important insights into the biological control of this process and how it might go wrong in diseases such as...
FAQs
Chiasmata help keep homologous chromosomes paired after crossing over and before their orientation is complete. This physical connection supports coordinated interaction with the spindle, allowing homologs to remain associated until they are prepared for separation in anaphase I. Their persistence therefore links genetic recombination with accurate chromosome segregation and contributes to the reduction of chromosome number.
Spindle microtubules extend from opposite poles and attach to kinetochores on the homologous chromosomes. These attachments position the homologs relative to the two poles, creating the arrangement required for their later separation. Successful orientation is important because it helps ensure that homologs, rather than improperly paired chromosome units, move apart during anaphase I.
Nuclear envelope breakdown removes the barrier between the chromosomes and the spindle machinery. Once homologous chromosomes become accessible, spindle microtubules can interact with their kinetochores and participate in establishing orientation. This transition connects the chromosome movements prepared during meiosis with the physical mechanism that will separate homologs in the next stage.
During this stage, homolog pairing is maintained by chiasmata while spindle attachments and chromosome orientation are established. These coordinated conditions prepare homologs for separation rather than immediate separation itself. The resulting arrangement enables anaphase I to reduce chromosome number by half while retaining the recombination patterns generated earlier in meiosis.
A study can focus on whether the nuclear envelope has broken down, whether spindle microtubules reach chromosome kinetochores, and whether homologous chromosomes remain connected by chiasmata. Examining these features together reveals whether chromosomes are accessible to the spindle, whether their orientation is developing, and whether homolog pairing is preserved before anaphase I.
Prometaphase I research connects the behavior of chiasmata and spindle attachments with the preservation of genetic recombination patterns and accurate meiotic division. Because meiosis produces cells with reduced chromosome number, errors at this stage can affect chromosome distribution. Studying these events therefore helps clarify mechanisms underlying genetic variation, fertility, and chromosomal errors caused by failed homolog segregation.