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[Organization of mitochondria in the growing hyphae of Neurospora crassa]

T V Potapova, L Iu Boĭtsova, S A Golyshev

    Tsitologiia
    |December 17, 2014
    PubMed

    Insights

    Mitochondria concentrate near the growing tips of Neurospora crassa hyphae, moving and dividing with cell growth. This apical concentration is linked to growth rate and nutrient conditions.

    Area of Science:

    • Cell Biology
    • Mycology
    • Biophysics

    Background:

    • Mitochondria are vital organelles for cellular energy production.
    • Understanding organelle distribution is key to cell growth dynamics.
    • Neurospora crassa is a model organism for studying fungal cell biology.

    Purpose of the Study:

    • To investigate the in vivo localization and behavior of mitochondria in growing Neurospora crassa hyphae.
    • To determine the relationship between mitochondrial distribution, hyphal growth rate, and nutrient availability.

    Main Methods:

    • In vivo fluorescent labeling of mitochondria.
    • Confocal microscopy to observe mitochondrial dynamics.
    • Cultivation of Neurospora crassa in different media (glucose, sorbitol).

    Main Results:

    • Filamentous mitochondria were concentrated within 30 μm of the hyphal apex.
    • Mitochondrial assemblies propagated with hyphal elongation, bifurcated, and formed de novo in new branches.
    • Mitochondrial concentration efficiency correlated with growth rate and was consistent across different carbon sources.

    Conclusions:

    • Mitochondria exhibit dynamic, polarized distribution in growing hyphae.
    • Apical mitochondrial concentration is an active process linked to growth rate.
    • Findings provide insights into cytoskeletal and electrical influences on organelle positioning.

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