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The primary cilium, made up of microtubules, acts as antennae on the cell surfaces for relaying external stimuli into the cells. These fine hair-like structures are present, generally one per cell. These are non-motile cilia in a 9+0 microtubules arrangement, where the central pair of microtubules are absent. The primary cilia arise from the basal body embedded in the cell membrane. Intraflagellar transport (IFT) carries requisite proteins from the cytoplasm to the cilium because the primary...
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Intermediate filaments (IFs) do not undergo spontaneous disassembly. Enzymes, kinases, and phosphatases add and remove phosphates from specific sites to regulate their disassembly. The IF concentration in the cytoplasm also regulates the disassembly. If the concentration crosses a threshold, it activates the protein kinases in the vicinity, allowing the phosphorylation of IFs.
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Complex microtubule structures are present in resting cells and in dividing cells. In resting cells, they are responsible for maintaining the cellular architecture, tracks for intracellular transport, positioning of organelles, assembly of cilia and flagella. They mediate the bipolar spindle assembly for chromosomal segregation and positioning of the cell division plate in dividing cells. The formation of microtubule complex structures depends on the cell type, cell stage, and cell function.
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Blebs are a type of membrane protrusion formed by the internal hydrostatic pressure of the cytoplasm. Blebs are observed in several cell types, including fibroblasts, immune cells, and single-celled organisms like the amoeba. The primary function of blebs is cell locomotion and apoptosis, but they are also found during necrosis and cell division. The life cycle of a bleb comprises an initiation phase followed by the expansion and retraction phases.
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The ciliary structures were first seen in 1647 by Antonie Leeuwenhoek while observing the protozoans. In lower organisms, these appendages are responsible for cell movement, while in higher organisms, these appendages help in the movement of the extracellular fluids within the body cavities.
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Filopodia are thin, actin-rich cellular protrusions that play an important role in many fundamental cellular functions. They vary in their occurrence, length, and positioning in different cell types, suggesting their diverse roles.
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Simple Detection of Primary Cilia by Immunofluorescence
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Taking Down the Primary Cilium: Pathways for Disassembly in Differentiating Cells.

Carolyn M Ott1, Saikat Mukhopadhyay2

  • 1Janelia Research Campus, Howard Hughes Medical Institute, Ashburn, Virginia, USA.

Bioessays : News and Reviews in Molecular, Cellular and Developmental Biology
|September 1, 2025
PubMed
Summary

This study explores how cells lose primary cilia during differentiation, identifying mechanisms like resorption and disassembly. Understanding these processes is key to preventing diseases linked to cilia dysfunction.

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Area of Science:

  • Cell Biology
  • Developmental Biology

Background:

  • Primary cilia are crucial signaling hubs in many cell types.
  • The mechanisms of primary cilia loss during cell differentiation are not well understood.

Purpose of the Study:

  • To investigate how ciliated and non-ciliated cell states emerge and are maintained during development.
  • To identify pathways responsible for primary cilia loss in differentiating cells.

Main Methods:

  • Examination of cellular differentiation processes.
  • Analysis of pathways regulating primary cilia assembly and disassembly.

Main Results:

  • Identified multiple mechanisms for primary cilia loss, including resorption, deconstruction, shortening, and disassembly.
  • Highlighted the dynamic regulation of ciliation states during development.

Conclusions:

  • Primary cilia loss is a regulated process involving distinct cellular mechanisms.
  • Dysregulation of primary cilia maintenance or suppression may contribute to diseases like cancer and neurodegeneration.