Afper1 contributes to cell development and aflatoxin biosynthesis in Aspergillus flavus

Area of Science:

• Mycology
• Food Safety
• Molecular Biology

Background:

• Aspergillus flavus produces carcinogenic aflatoxins, threatening food safety and human health.
• Identifying regulatory proteins controlling aflatoxin biosynthesis is critical for mitigation strategies.

Purpose of the Study:

• To characterize the novel Afper1 protein's role in Aspergillus flavus.
• To investigate Afper1's influence on fungal development, stress response, and aflatoxin production.

Main Methods:

• Afper1 deletion mutant construction and phenotypic analysis.
• Proteomics to identify differentially regulated proteins in ΔAfper1.
• Experimental validation of reactive oxygen species (ROS) accumulation and chromatin remodeling.

Main Results:

• Afper1 is essential for hyphal growth, conidial/sclerotial production, and stress responses.
• Aflatoxin production was significantly impaired in the Afper1 deletion mutant (ΔAfper1).
• Afper1 deletion led to ROS accumulation, altered chromatin structure, and dysregulated ER homeostasis.

Conclusions:

• Afper1 plays a key regulatory role in Aspergillus flavus development and secondary metabolite biosynthesis.
• Targeting Afper1 could be a strategy to control aflatoxin contamination in crops.
• Afper1 influences fungal physiology through chromatin remodeling and ER homeostasis, impacting ROS levels.