Prophase
Prophase - Related Videos
07:18
Live Imaging Characterization of Centromere Movements During Male Meiotic Prophase in Arabidopsis thaliana
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2025
Chromosome movement during meiotic prophase is a poorly understood phenomenon that is fundamental to spore formation. This protocol describes a method to acquire, analyze, and quantify centromere movements during meiotic prophase in Arabidopsis thaliana male meiocytes.
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.
08:49
Use of Time Lapse Microscopy to Visualize Anoxia-induced Suspended Animation in C. elegans Embryos
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Cited by 3 •
2012
Described here is an in vivo technique to image sub-cellular structures in animals exposed to anoxia using a gas flow through microincubation chamber in conjunction with a spinning disc confocal microscope. This method is straightforward and flexible enough to suit a variety of experimental parameters and model systems.
07:16
The In Vitro Single Oocyte Reporter Assay: A Technique to Study Target mRNA Translation Regulation During In Vitro Oocyte Maturation
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2025
In this video, we demonstrate that in the presence of a phosphodiester inhibitor, the oocyte cell cycle is arrested at prophase-I, during which transcribed mRNAs are stored in the absence of translation. After the release of the inhibitor, oocyte maturation resumes, and the cells enter metaphase. The signal of reporter mRNA fused with the target gene in metaphase-I indicates the activation of translational machinery and protein expression.
01:51
Lampbrush Chromosomes
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2020
In 1882, Flemming observed lampbrush chromosomes (LBC) in salamander eggs. Later in 1892, Rückert observed LBCs in shark egg cells and coined the term "lampbrush chromosomes" because they looked like brushes used to clean kerosene lamps. LBCs are made up of two pairs of conjugating homologous chromatids. Each chromatid consists of alternatively positioned regions of condensed-inactive chromatin and loosely placed-active side loops, which can be contracted and extended. The loops resemble the...
FAQs
Chromatin condensation organizes replicated genetic material into distinct, visible chromosomes before the cell separates it. This structural change makes chromosome behavior easier to coordinate with the developing spindle and supports accurate segregation during nuclear division. In biology research, observing this transition helps investigators assess how cells prepare genetic material for orderly division.
As prophase progresses in mitosis, centrosomes move apart while spindle microtubules begin forming. Together, these changes establish the cellular framework that will guide chromosome movement during nuclear division. The relationship is important because chromosome organization alone is insufficient; the cell must also prepare a spindle system capable of supporting accurate distribution of genetic material.
Prophase I includes events that do not characterize mitotic prophase: homologous chromosomes pair, and crossing over occurs between them. This exchange generates genetic variation, giving meiotic prophase I a role beyond chromosome organization for division. Comparing the two stages helps explain why meiosis contributes to variation, whereas mitotic division primarily supports repeated cellular propagation.
These features mark coordinated preparation for nuclear division rather than isolated cellular events. Condensed chromosomes indicate that genetic material has become organized, while disappearance of the nucleolus and preparation for nuclear-envelope breakdown signal broader nuclear reorganization. Examining the features together provides a stronger basis for identifying prophase and evaluating the timing of cell-cycle changes.
Researchers can look for several simultaneous cellular features: chromatin has condensed into visible chromosomes, the nucleolus has disappeared, centrosomes are moving apart, and spindle microtubules are beginning to form. The nuclear envelope is also preparing to break down. These observations help distinguish prophase from other stages and support studies of chromosome behavior in biology.
Prophase establishes the chromosome organization and division machinery needed for later segregation, so its study provides context for understanding when nuclear division is properly prepared. In developmental biology, this helps connect cell-cycle behavior with developing systems. It also supports investigation of abnormalities that arise when chromosome separation does not occur correctly.