A fungus's anti-duplication defense quietly reshapes its working genes too
Fungal Genomics
The same kind of fungal genome-editing process studied here helps explain why molds and mushrooms in your compost pile or garden soil evolve new traits faster than many plants do.
Neurospora crassa, a common bread mold, has a built-in system that scrambles DNA in duplicated genes to stop them from causing problems. Scientists found this system also leaves its mark on regular, single-copy genes that the fungus actually needs, nudging its evolution in ways no one expected. It turns out a process built for genome defense doubles as a long-term driver of how this fungus changes over generations.
Key Findings
Repeat-induced point (RIP) mutation, a defense mechanism targeting duplicated DNA, also introduces mutations into single-copy functional genes in Neurospora crassa
These RIP-induced mutations show distinct patterns compared to mutations arising from normal evolutionary processes
The findings suggest RIP mutation acts as a broader evolutionary force shaping the fungal genome beyond its original defensive role
chevron_right Technical Summary
A fungal genome-defense system meant to disable duplicate genes also chips away at mutations in single, functional genes over time, acting as a steady evolutionary force in the bread mold Neurospora crassa rather than just a defense mechanism.
Abstract Preview
Original paper
Pervasive influences of repeat-induced point mutation on single-copy functional genes reveal its evolutionary importance in Neurospora crassa
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