Cell fusion in the filamentous fungus, Neurospora crassa

André Fleissner1, Anna R Simonin, N Louise Glass

  • 1Department of Plant and Microbial Biology, The University of California, Berkeley, CA, USA.

Insights

Filamentous fungi use hyphal fusion for growth and reproduction. Researchers are uncovering the complex genetic regulation of this process in Neurospora crassa, revealing novel functions for known genes.

Area of Science:

  • Mycology
  • Cell Biology
  • Genetics

Background:

  • Hyphal fusion is a critical process in the life cycle of filamentous fungi, essential for both vegetative growth and sexual reproduction.
  • This process shares fundamental mechanisms with cell fusion in other eukaryotes, involving cell recognition, adhesion, and membrane merger.

Purpose of the Study:

  • To elucidate the complex cellular regulation of hyphal fusion in the model filamentous fungus Neurospora crassa.
  • To identify and characterize genes involved in hyphal fusion, including conserved and fungal-specific proteins.

Main Methods:

  • Utilized fluorescence and live-cell imaging techniques.
  • Employed cell and molecular biological approaches.
  • Analyzed hyphal fusion mutants in Neurospora crassa.

Main Results:

  • Identified several genes essential for hyphal fusion in Neurospora crassa.
  • Discovered that some genes involved in hyphal fusion are conserved across eukaryotes, while others are fungal-specific.
  • Revealed novel roles for genes with previously known non-fusion-related functions in the context of hyphal fusion.

Conclusions:

  • Understanding hyphal fusion in filamentous fungi offers a paradigm for eukaryotic cell communication and fusion.
  • Further research into the physiological and developmental roles of hyphal fusion is needed to understand environmental adaptation in fungi.

Related Concept Videos

Fusion of Secretory Vesicles with the Plasma Membrane01:26

Fusion of Secretory Vesicles with the Plasma Membrane

Proteins and neurotransmitters in secretory vesicles can be released from a cell upon vesicle docking, priming, and fusion with the plasma membrane. Vesicles are docked and primed in preparation for the quick exocytosis of their contents in response to a stimulus. The fusion process is mainly carried out by a SNAP Receptor or SNARE complex, consisting of synaptobrevin, syntaxin-1, and SNAP-25.
In 1993, Jim Rothman proposed that the antiparallel pairing of vesicular and transmembrane SNAREs, or...
SNAREs and Membrane Fusion01:43

SNAREs and Membrane Fusion

Once a transport vesicle has recognized its target organelle, the vesicular membrane needs to fuse with the target membrane to unload the cargo. Transmembrane proteins called SNAREs present on organelle membranes and their vesicles, mediate vesicle fusion.
SNAREs exist in pairs that symmetrically interact and catalyze the fusion of the lipid bilayers in vesicle and target organelle. v-SNARE in the vesicle membrane are single polypeptide chains that bind to a complementary t-SNARE, composed of 2...
Fungal Phylum Ascomycota01:28

Fungal Phylum Ascomycota

Phylum Ascomycota, a major division within the subkingdom Dikarya, comprises a diverse range of fungal species, including both unicellular yeasts and filamentous molds such as Aspergillus and Penicillium. These fungi thrive in a variety of habitats, from aquatic ecosystems to terrestrial environments, playing crucial ecological and economic roles.Morphology and ReproductionThe defining characteristic of Ascomycetes, commonly referred to as sac fungi, is the ascus—a sac-like structure that...
Formation of Intermediate Filaments00:57

Formation of Intermediate Filaments

Intermediate filaments are cytoskeletal proteins with higher tensile strength and flexibility than microfilaments and microtubules. Unlike the other two cytoskeletal proteins, intermediate filament formation lacks the enzymatic activity to hydrolyze nucleotides like ATP and GTP to generate energy for polymerization. Therefore, the formation of intermediate filaments is multistep self-assembly. The involvement of any accessory proteins in intermediate filament formation has not yet been reported.
Diversity of Protists IV01:27

Diversity of Protists IV

Amoebozoa represent a diverse group of terrestrial and aquatic protists that utilize lobe-shaped pseudopodia for locomotion and feeding. This characteristic differentiates them from the Rhizaria, which possess threadlike pseudopodia. The primary classifications within Amoebozoa include gymnamoebas, entamoebas, and the plasmodial and cellular slime molds. Phylogenetic evidence indicates that Amoebozoa diverged from a lineage that ultimately gave rise to fungi and animals.Gymnamoebas and...
Mechanism of Filopodia Formation01:39

Mechanism of Filopodia Formation

Filopodia are thin, actin-rich cellular protrusions that play an important role in many fundamental cellular functions. They vary in their occurrence, length, and positioning in different cell types, suggesting their diverse roles.
Their main function is to guide migrating cells during normal tissue morphogenesis or cancer metastasis by recognizing and making initial contacts with the extracellular matrix. However, they can also act as stationary cell anchors or help to establish communication...