Fungal infection of insects: molecular insights and prospects

Area of Science:

• Mycology
• Insect Pathology
• Microbial Ecology

Background:

• Entomopathogenic fungi (EPF) are crucial natural regulators of insect populations.
• Key EPF genera, Metarhizium and Beauveria, are extensively studied for their infection mechanisms and use as biopesticides.
• Fungal infection involves complex interactions with the insect host, including overcoming microbial and immune defenses.

Purpose of the Study:

• To review the diverse genes, pathways, and secondary metabolites involved in entomopathogenic fungal infections.
• To highlight the importance of fungal competition with insect ectomicrobiota before cuticle penetration.
• To discuss the strategies EPF employ to subvert or evade host antifungal immunity.

Main Methods:

• Literature review of studies on entomopathogenic fungi.
• Analysis of genetic and metabolic factors in fungal-entomopathogen interactions.
• Synthesis of current knowledge on fungal pathobiology and host immune evasion.

Main Results:

• EPF infection is a multi-step process requiring adaptation and overcoming host barriers.
• Fungi must compete with the insect's native microbiota (ectomicrobiota) prior to cuticle penetration.
• EPF utilize effector proteins and chemicals, similar to plant pathogens, to evade or subvert host immunity.

Conclusions:

• Understanding the molecular and ecological factors of EPF infection is vital for developing effective mycoinsecticides.
• EPF pathobiology offers insights into broader microbe-animal interactions and immune system evasion.
• Future research should focus on elucidating these complex interactions for novel applications in pest control and biological sciences.