What is it about?
Gut‑fungi research mostly focuses on yeasts, while intestinal filamentous fungi remain poorly explored. We identified Mucor racemosus, a gut‑resident filamentous fungus that shields mice from radiation‑induced intestinal injury through two complementary strategies. The fungus produces L‑glutamate, L‑aspartate and DL‑lysine, which directly support DNA‑damage repair in radiation‑damaged gut cells. It also secretes methylthioadenosine (MTA). Though MTA provides no direct protection, it promotes growth of the beneficial bacterium Limosilactobacillus reuteri, which converts MTA into radioprotective methionine. This fungus‑bacteria metabolic partnership boosts gut radiation tolerance. Notably, cheese fermented with M. racemosus also alleviated radiation gut damage in animal experiments.
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Why is it important?
Radiotherapy frequently damages patients’ intestines, lowering quality of life and limiting cancer‑treatment options. Previously, gut filamentous fungi were often regarded as transient food‑derived microbes. Our work proves they are functionally important community members that coordinate cross‑kingdom metabolic cooperation for host defense. Pre‑clinical assays show Mucor racemosus carries no detectable mycotoxins and does not impair tumor‑killing by radiotherapy. Its protective effect can be delivered via fermented food, opening new opportunities for food‑based or biotherapeutic interventions against radiation‑related gastrointestinal complications. This study also expands our knowledge of health‑promoting fungus‑bacterial crosstalk in the gut.
Perspectives
I hope this article makes what people might think is a niche, obscure area like gut filamentous fungi and microbe‑metabolite crosstalk, kind of interesting and maybe even exciting. Most of us only encounter gut fungi discussed in the context of infection, yet symbiotic fungi can deliver tangible benefits for host health. While our pre‑clinical findings with fermented food hold promise for easing radiation‑induced intestinal injury, translating these results to immunocompromised patients demands rigorous additional safety validation. We hope this work sparks broader interest in the under‑explored functional roles of gut filamentous fungi.
Huiwen Xiao
Read the Original
This page is a summary of: A gut symbiotic filamentous fungus reprograms host metabolism and the microbiota to confer radioprotection, Proceedings of the National Academy of Sciences, August 2026, Proceedings of the National Academy of Sciences,
DOI: 10.1073/pnas.2608386123.
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