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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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Most animal cells comprise a pair of centrioles together called a centrosome. The cell duplicates its centrosome and contains two centrosomes side-by-side, which begin to move apart during the prophase. As the centrosomes migrate to two different sides of the cell, microtubules start extending from each centrosome toward the other end. The mitotic spindle is composed of the centrosomes and their emerging microtubules.
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Positioning the cell division plane is a critical step during development and cell differentiation, particularly during mitosis when the plane is essential for determining the size of the two daughter cells. The cell division plane is perpendicular to the plane of chromosome segregation, but different types of organisms have different cell division mechanisms to suit their morphology and function. 
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Primary cilium: an elaborate structure that blocks cell division?

Yi-Ni Ke1, Wan-Xi Yang1

  • 1The Sperm Laboratory, College of Life Sciences, Zhejiang University, Hangzhou 310058, China.

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|June 28, 2014
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Summary
This summary is machine-generated.

Primary cilia, essential cell sensors, disassemble during cell division, regulated by kinases like Aurora kinase A. Their persistence in some cells challenges current understanding of cell cycle incompatibility.

Keywords:
AurACiliogenesisNekPlk1Primary cilia

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Area of Science:

  • Cell Biology
  • Molecular Biology

Background:

  • Primary cilia are microtubule-based organelles with a
  • 9+0
  • axoneme, acting as cellular sensory centers regulating proliferation and development.
  • They are distinguished from motile
  • 9+2
  • cilia and possess a specialized primary ciliary pocket.
  • The basal body, a form of the centriole, is crucial for primary cilium formation and function.

Purpose of the Study:

  • To review the detailed structure of primary cilia.
  • To discuss the relationship between primary cilia disassembly and cell cycle progression.
  • To explore the role of mitotic kinases in regulating these processes.

Main Methods:

  • Literature review focusing on primary cilia structure and function.
  • Analysis of studies investigating the interplay between cell cycle regulation and centrosomal changes.
  • Examination of the roles of specific kinases (Aurora kinase A, Plk1, Nek) in primary cilia dynamics.

Main Results:

  • Centrosomal changes, particularly kinase activity, regulate cell cycle progression.
  • Aurora kinase A (AurA), Polo-like kinase 1 (Plk1), and NIMA-related Kinase (Nek) promote primary cilia disassembly, linking them to cell cycle progression.
  • The presence of primary cilia during spermatocyte division contradicts the notion of their incompatibility with cell division.

Conclusions:

  • Primary cilia disassembly is linked to cell cycle progression, involving specific mitotic kinases.
  • The regulation of primary cilia dynamics by centrosomal kinases offers insights into non-mitotic functions.
  • Further research is needed to fully understand the complex relationship between primary cilia and cell division.