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Quantitative Analysis of Aspergillus nidulans Growth Rate using Live Microscopy and Open-Source Software
11:30

Quantitative Analysis of Aspergillus nidulans Growth Rate using Live Microscopy and Open-Source Software

Published on: July 24, 2021

Long-distance movement of Aspergillus nidulans early endosomes on microtubule tracks

Juan F Abenza1, Areti Pantazopoulou, José M Rodríguez

  • 1Departamento de Microbiología Molecular, Centro de Investigaciones Biológicas CSIC, Ramiro de Maeztu 9, Madrid, Spain.

Traffic (Copenhagen, Denmark)
|November 13, 2008
PubMed

Insights

Fungal hyphal growth relies on endocytosis and membrane trafficking. This study reveals RabA(Rab5) endosomes move along microtubules, crucial for polarized growth in Aspergillus nidulans.

Area of Science:

  • Cell Biology
  • Mycology
  • Molecular Biology

Background:

  • Intracellular membrane trafficking is critical for fungal hyphal tip growth, involving apical secretion and subapical endocytosis.
  • The identity, dynamics, and function of endosomal compartments in filamentous fungi are poorly understood.
  • Microtubule-based transport is essential for directing cellular components in growing hyphae.

Purpose of the Study:

  • To investigate the dynamics and function of endosomal compartments in Aspergillus nidulans.
  • To elucidate the role of RabA(Rab5) and cytoplasmic dynein in fungal hyphal tip growth.
  • To understand the relationship between endocytic recycling and microtubule organization at the hyphal tip.

Main Methods:

  • Localization studies of RabA(Rab5) using FM4-64 labeling in Aspergillus nidulans.
  • Analysis of endosomal dynamics using live-cell imaging on microtubule tracks.
  • Investigating the effects of impaired dynein function (nudA1 mutation) on endosomal trafficking.

Main Results:

  • RabA(Rab5) localizes to mobile endosomes that move bidirectionally on microtubule tracks.
  • These RabA(Rab5) endosomes do not overlap with static mature endosomes or vacuoles.
  • Impaired dynein function leads to RabA(Rab5) endosome accumulation at the hyphal tip, indicating a dynein loading region.

Conclusions:

  • Polarized fungal hyphal growth involves RabA(Rab5) endosomes trafficking along microtubules.
  • A dynein loading region exists at the hyphal tip, essential for regulating endosomal transport.
  • Endocytic recycling is spatially and functionally linked to microtubule plus ends at the hyphal tip.

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