Microtubule dynamics and organization during hyphal growth and branching in Neurospora crassa

Fungal Genetics and Biology : FG & B
Rosa R Mouriño-PérezSalomon Bartnicki-García

Abstract

By confocal microscopy, we analyzed microtubule (Mt) behavior during hyphal growth and branching in a Neurospora crassa strain whose Mts had been tagged with GFP. Images were assembled spatially and temporally to better understand the 3-D organization of the microtubular cytoskeleton and a clearer view of its dynamics. Cytoplasmic Mts were mainly arranged longitudinally along the hyphal tube. Straight segments were rare; most Mts showed a distinct helical curvature with a long pitch and a tendency to intertwine with one another to form a loosely braided network throughout the cytoplasm. This study revealed that the microtubular cytoskeleton of a hypha advances as a unit, i.e., as the cell elongates, it moves forward by bulk flow. Nuclei appeared trapped in the microtubular network and were carried forward in unison as the hypha elongated. During branching, one or more cortical Mts became associated with the incipient branch and were pulled into the emergence of the branch. As extension of the branch and distortion of the Mts continued, Mts soon were severed with both new Mt ends (+ and -) present in the new branch. Although the exact mechanisms for addition Mt recruitment into the branch remains an open question, the recorded e...Continue Reading

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