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The developing Drosophila eye - a new model to study centriole reduction.

Maria G Riparbelli1, Veronica Persico1, Marco Gottardo1

  • 1Department of Life Sciences, Via A. Moro 2, University of Siena, 53100 Siena, Italy.

Journal of Cell Science
|January 24, 2018
PubMed
Summary

Centrioles in developing Drosophila eye cells lose microtubule organization ability and fail to duplicate, even when accumulating key proteins like Plk4. This indicates a complex regulation of centriole duplication and integrity during development.

Keywords:
Centriole eliminationCentriole structureCentrosomeDrosophila

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Area of Science:

  • Cell Biology
  • Developmental Biology
  • Structural Biology

Background:

  • Centrioles are crucial for organizing microtubules and cell division.
  • The formation and duplication of centrioles involve a complex set of proteins.
  • Understanding centriole regulation is vital for comprehending cell cycle control and developmental processes.

Purpose of the Study:

  • To investigate the regulation of centriole duplication and microtubule organization in developing Drosophila retinal cells.
  • To identify factors that govern centriole integrity and function during cellular differentiation.

Main Methods:

  • Immunofluorescence microscopy to detect protein localization (γ-tubulin, Cnn, Spd-2, Plp, Asl, Ana1, Plk4, Sas-4).
  • Analysis of centriole structure and number during different developmental stages (third-instar larvae, pupal life).
  • Genetic analysis to assess the roles of specific proteins in centriole duplication.

Main Results:

  • Developing Drosophila retinal cells lack γ-tubulin around centrioles, impairing microtubule organization.
  • Key centriole duplication and pericentriolar material proteins (Cnn, Spd-2, Plp) are lost in larval stages.
  • While mother centrioles accumulate Asl and Ana1, daughter centrioles fail to recruit Plk4 and duplicate; mother centrioles accumulating Plk4 also do not duplicate.
  • Centriole number decreases and structural defects arise during pupal development, yet centriole integrity persists despite the absence of Asl, Ana1, and Sas-4.

Conclusions:

  • Centriole duplication in Drosophila retinal cells is tightly regulated and not solely dependent on Plk4 accumulation.
  • Centriole structural integrity can be maintained independently of certain key proteins like Asl, Ana1, and Sas-4.
  • The study reveals novel insights into the complex mechanisms governing centriole duplication and stability during development.