Acentriolar Mtocs
Acentriolar Mtocs - Related Videos
08:29
Workflow Using a Cryogenic Coincident Fluorescence, Electron, and Ion Beam Microscope for Targeted Milling of Cells
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Cited by 2 •
2025
This workflow enables lamella production targeting fluorescently labeled biological structures that are small (<1 μm in axial extent) and rare (1 copy per cell) using a cryogenic tri-coincident imaging platform. This platform integrates fluorescence microscopy, focused ion beam milling, and scanning electron microscopy at a single focal position and enables simultaneous fluorescence microscopy while milling.
09:16
Meiotic Spindle Assessment in Mouse Oocytes by siRNA-mediated Silencing
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Cited by 10 •
2015
Here, we present a protocol for specific siRNA-mediated mRNA depletion followed by immunofluorescence analysis to evaluate meiotic spindle assembly and organization in mouse oocytes. This protocol is suitable for in vitro depletion of transcripts and functional assessment of different spindle and/or MTOC-associated factors in oocytes.
FAQs
Their activity depends on recruiting microtubule-nucleating components, including γ-tubulin complexes, to cellular sites where microtubules can be organized. These components allow the sites to establish microtubule-organizing capacity despite the absence of centrioles. In developmental contexts, the resulting organization supports spindle formation and helps cells prepare for accurate chromosome segregation during division.
γ-tubulin complexes contribute to the nucleation of microtubules at acentriolar organizing sites. Recruitment of these components provides the molecular basis for building microtubule arrays that can be arranged into functional spindle structures. Their presence therefore links the assembly of an acentriolar MTOC to the cellular processes required for meiotic and mitotic division.
Clustering and reorganization allow these organizing sites to respond to developmental cues and change the spatial arrangement of microtubules when cellular demands shift. This flexibility is especially important as oocytes and early embryos transition through meiotic and mitotic divisions. Proper reorganization helps establish spindle structures suited to chromosome segregation and changing developmental conditions.
The key distinction is that acentriolar MTOCs organize and nucleate microtubules without the centrioles characteristic of conventional centrosomes. Functionally, they can still support spindle construction, chromosome segregation, and cellular organization. This comparison shows that developmental cells can achieve essential microtubule-organizing outcomes through a centriole-independent arrangement of nucleating components.
A developmental study can examine how these sites form, recruit nucleating components, cluster, and reorganize as cells enter meiotic or mitotic division. It should also relate those changes to spindle construction and chromosome segregation. Connecting MTOC behavior with these developmental events helps determine whether microtubule organization remains functional as the embryo progresses through early divisions.
Disrupted organization can provide evidence that spindle assembly or microtubule arrangement has been compromised. Because these structures support chromosome segregation, such failures may lead to chromosome missegregation and developmental abnormalities. Studying the connection between MTOC behavior and these outcomes helps researchers identify how errors in cellular organization affect developmental progression.
They clarify how oocytes and early embryos establish functional meiotic and mitotic spindles when centrioles are not providing the conventional organizing framework. Their study connects molecular component recruitment and spatial reorganization with chromosome segregation and cell division. This makes them useful for understanding how early developmental cells coordinate structural organization with accurate inheritance of chromosomes.