Development of a PCR-based mating-type assay for Clavicipitaceae.

Area of Science:

• Mycology
• Molecular Biology
• Fungal Genetics

Background:

• The Clavicipitaceae family encompasses agriculturally and medically significant fungi.
• Accurate determination of mating types is crucial for understanding fungal reproduction and population genetics.
• Existing methods for mating-type determination can be laborious or lack broad applicability.

Purpose of the Study:

• To develop a rapid and reliable PCR-based assay for identifying mating types in Clavicipitaceae.
• To design specific primer sets targeting conserved regions of mating-type genes.
• To evaluate the assay's applicability across various genera within the family.

Main Methods:

• Designing PCR primer sets targeting the conserved alpha and HMG box domains of MAT1-1-1 and MAT1-2-1 genes, respectively.
• Applying the developed PCR assay to diverse clavicipitaceous genera, including Balansia, Claviceps, Cordyceps, and Epichloë.
• Constructing phylogenetic trees based on mating-type gene sequences.

Main Results:

• A robust PCR-based mating-type assay was successfully developed for Clavicipitaceae.
• The assay demonstrated applicability across multiple genera, identifying the presence of either MAT1-1-1 or MAT1-2-1 in most isolates, suggesting heterothallism.
• Phylogenetic analyses using mating-type genes provided higher resolution than 18S rDNA and correlated well with econutritional modes.

Conclusions:

• The developed PCR assay is a valuable tool for rapid mating-type determination in Clavicipitaceae.
• This assay facilitates further research into the reproductive biology and evolutionary relationships within the family.
• The findings support the classification of most studied Clavicipitaceae as heterothallic.