# Feeding Drosophila highly radioresistant fungi improves survival and gut morphology following acute gamma radiation exposure

## TL;DR

Feeding fruit flies a radiation-resistant fungus improves their survival and gut health after radiation exposure.

## Contribution

Identifies Aureobasidium pullulans as a dietary fungus that extends male Drosophila lifespan and improves gut morphology after irradiation.

## Key findings

- Feeding Aureobasidium pullulans for two days increased male Drosophila lifespan after irradiation.
- Aureobasidium pullulans improved gut nuclear morphology in irradiated males.
- Rhodotorula taiwanensis did not provide protective effects against irradiation.

## Abstract

Diverse fungi have been historically vital reservoirs of drug discovery, providing life-saving pharmaceuticals. Many species of fungi, yeasts in particular, are highly resistant to radiation, with their cellular contents potentially conferring dietary radioresistance. We developed a Drosophila model to test whether feeding two highly radioresistant fungi, Aureobasidium pullulans and Rhodotorula taiwanensis, could improve fly lifespan and gut morphology after acute irradiation. We constructed a dosimetry curve for the lifespan response of males and females to irradiation and found dose-dependent and sex-specific effects on lifespan. We also determined that the sex-specific response to irradiation correlated with nuclear morphology defects in the gut, with the more radiosensitive males displaying increased midgut cellular holes and aberrant nuclear morphology. To determine if feeding Aureobasidium pullulans and Rhodotorula taiwanensis before irradiation could improve survival and gut morphology, we first exclusively fed males and females each fungus and observed that they tolerated the diet well. Using these methods, we found that only two days of pre-feeding Aureobasidium pullulans increased male lifespan, but not female, after irradiation, and improved nuclear morphology in the gut. However, dietary Rhodotorula taiwanensis was not protective. Overall, this study identified a highly radioresistant dietary fungus, Aureobasidium pullulans, as effective for extending male Drosophila lifespan and improving gut morphology following irradiation. Since the gut is particularly sensitive to the effects of irradiation, this fungus indicates a potential therapeutic for patients undergoing radiotherapy. Furthermore, this method could identify additional radioresistant fungi that protect the gut from radiation injury.

The online version contains supplementary material available at 10.1038/s41598-025-31545-6.