A-to-I mRNA editing in fungi: occurrence, function, and evolution.

Area of Science:

• Molecular Biology
• Genetics
• Evolutionary Biology

Background:

• A-to-I RNA editing is a post-transcriptional modification converting adenosine to inosine.
• While conserved in animals via ADARs, its presence in non-animals was questioned.
• Recent findings reveal widespread A-to-I mRNA editing in filamentous fungi.

Purpose of the Study:

• To review recent discoveries on A-to-I mRNA editing in fungi.
• To discuss its occurrence, regulation, function, and evolutionary significance.
• To highlight differences between fungal and animal RNA editing.

Main Methods:

• Review of recent scientific literature on fungal RNA editing.
• Analysis of genome-wide editing data in species like Fusarium graminearum and Neurospora crassa.
• Comparative analysis of editing patterns across different fungal lineages.

Main Results:

• A-to-I mRNA editing is conserved in filamentous ascomycetes, occurring during sexual development.
• Editing plays vital roles in fungal sexual development and is regulated in a tissue/development-specific manner.
• Unlike animals, most fungal editing is non-synonymous, often advantageous, and conserved among species.

Conclusions:

• A-to-I RNA editing is an evolutionarily conserved and functionally important process in filamentous fungi.
• Fungal RNA editing exhibits unique characteristics, particularly non-synonymous and positively selected editing events.
• Further research into fungal RNA editing can illuminate its evolutionary trajectory and biological roles.