Neurospora crassa ve-1 affects asexual conidiation

Area of Science:

• Mycology
• Developmental Biology
• Genetics

Background:

• The velvet factor (veA) in Aspergillus nidulans is crucial for sexual fruiting body formation.
• The veA gene is conserved across fungi, with an ortholog (ve-1) found in Neurospora crassa.

Purpose of the Study:

• To investigate the function and conservation of the ve-1 gene in Neurospora crassa and its role in heterologous expression in Aspergillus nidulans.
• To compare the developmental regulatory roles of velvet proteins in two distinct ascomycetes.

Main Methods:

• Cross-complementation experiments between Aspergillus nidulans and Neurospora crassa.
• Homologous gene replacement to create a ve-1 deletion mutant in Neurospora crassa.
• Analysis of developmental phenotypes under varying light conditions.

Main Results:

• The Neurospora crassa ve-1 gene, including its promoter and coding sequence, can functionally complement an Aspergillus nidulans veA deletion mutant.
• Expression of N. crassa ve-1 in A. nidulans induced light-dependent development: sexual reproduction in darkness and asexual sporulation under light.
• Deletion of N. crassa ve-1 resulted in shortened aerial hyphae and increased, non-light-dependent asexual conidiation.

Conclusions:

• Velvet proteins (VeA and Ve-1) are conserved in ascomycetes but exhibit both shared and distinct functions in regulating fungal development.
• Light plays a significant role in mediating the developmental functions of the conserved velvet proteins.