Aflrpn4 Represents a Promising Target for Mitigating Aspergillus flavus Growth and Aflatoxin Contamination
Xingsai Liu1,2, Yanli Xin1,2, Kashif Iqbal Sahibzada3
1Food Laboratory of Zhongyuan, Luohe 462044, China.
Toxins
|July 27, 2026
Summary
The transcription factor Aflrpn4 is crucial for Aspergillus flavus growth, development, and aflatoxin B1 production. Targeting Aflrpn4 offers a novel strategy for controlling fungal contamination in food supplies.
Area of Science:
- Mycology
- Molecular Biology
- Food Science
Background:
- Aspergillus flavus produces aflatoxin B1, a potent toxin threatening food security and public health.
- Novel molecular targets are needed for effective fungicides against A. flavus.
Purpose of the Study:
- To investigate the regulatory role of the transcription factor Aflrpn4 in Aspergillus flavus.
- To elucidate Aflrpn4's mechanisms in controlling fungal growth, development, pathogenicity, and aflatoxin biosynthesis.
Main Methods:
- Gene deletion and complementation strains of A. flavus were constructed.
- Phenotypic analyses included colony growth, conidial yield, and structural integrity.
- Aflatoxin B1 (AFB1) content, colonization capacity, and gene expression were assessed.
Main Results:
- Deletion of Aflrpn4 (ΔAflrpn4) severely restricted growth, reduced conidiation, and impaired conidiophore structure.
- ΔAflrpn4 significantly reduced AFB1 content by 52% and compromised colonization in storage assays.
- Aflrpn4 deletion downregulated key aflatoxin biosynthesis genes (aflR, aflS, aflP) and affected stress response and redox homeostasis.
Conclusions:
- Aflrpn4 is a pivotal regulator of A. flavus vegetative growth, asexual development, stress adaptation, and aflatoxin production.
- Aflrpn4 is a promising molecular target for developing interventions against A. flavus and aflatoxin contamination.
