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Fungi utilize ancient antimicrobial proteins to attack hosts and their microbiomes, plant researchers discover

Phys · · 826 words · By Mathias Martin

A research team discovered that fungal effector proteins, molecules used by pathogens to infect hosts, appear to have evolved from ancient antimicrobial proteins. The study suggests that fungi initially used these proteins for competition with other microorganisms, and later adapted them to suppress host immune systems, potentially offering new insights for disease control in agriculture and medicine.

open_in_new Read the original article: https://phys.org/news/2026-04-fungi-ancient-antimicrobial-proteins-hosts.html

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10%
Propaganda Score
confidence: 90%
Low risk. This article shows minimal use of propaganda techniques.

fact_checkFact-Check Results

10 claims extracted and verified against multiple sources including cross-references, web search, and Wikipedia.

check_circle Corroborated 4
info Single Source 4
help Insufficient Evidence 2
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“An international research team led by Cologne-based plant scientist Professor Dr. Bart Thomma from the Institute for Plant Sciences, the Collaborative Research Center MiBiNet and the CEPLAS Cluster of Excellence for Plant Sciences has discovered the surprising evolutionary origin of fungal effector proteins: molecules that pathogens use today to infect their hosts appear to have evolved from ancient antimicrobial proteins.”
CORROBORATED
Multiple web search results discuss the concept that fungal effectors evolved from ancient antimicrobial proteins, citing the study's findings and the general mechanism. The evidence confirms the core premise of the claim.
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web search NEUTRAL — A diagram showing the infecting structures and effector delivery strategies of a model hemibiotrophic pathogen, Phytophthora infestans. Fungal effectors are proteins or non-proteinaceous molecules (su…
https://en.wikipedia.org/wiki/Fungal_effectors
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web search NEUTRAL — In their study, the scientists use the example of the Verticillium dahliae effector Vd424Y to show how an effector influences the plant microbiome during infection and manipulates host immunity.
https://phys.org/news/2026-04-fungi-ancient-antimicrobial-pr…
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web search NEUTRAL — Fungal effector proteins function at the interfaces of diverse interactions between fungi and their plant and animal hosts, facilitating interactions that are pathogenic or mutualistic. Recent advance…
https://www.sciencedirect.com/science/article/pii/S136952742…
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“The study, "Plant-associated fungi co-opt ancient antimicrobials for host manipulation," is published in Science Advances.”
CORROBORATED
Multiple web search results explicitly name the study title, 'Plant-associated fungi co-opt ancient antimicrobials for host manipulation,' and confirm its publication in Science Advances.
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web search NEUTRAL — The study, "Plant-associated fungi co-opt ancient antimicrobials for host manipulation," is published in Science Advances.Discover the latest in science, tech, and space with over 100,000 subscribers …
https://phys.org/news/2026-04-fungi-ancient-antimicrobial-pr…
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web search NEUTRAL — 2025. Plant‐associated fungi co‐opt ancient antimicrobials for host manipulation.A conserved extracellular Ribo1 with broad‐spectrum cytotoxic activity enables smut fungi to compete with host‐associat…
https://pmc.ncbi.nlm.nih.gov/articles/PMC12676067/
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web search NEUTRAL — Plant-associated fungi co-opt ancient antimicrobials for host manipulation.
https://scholar.google.com/citations?user=Q74znA8AAAAJ&hl=en
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“Lead author Dr. Fantin Mesny has discovered that, roughly speaking, up to half of all proteins secreted by a fungus have antimicrobial activities, i.e. they can disrupt or kill microorganisms.”
CORROBORATED
One web search result directly quotes the lead author, Dr. Fantin Mesny, stating that 'up to half of all proteins secreted by a fungus have antimicrobial activities.' This specific claim is supported by the search results, though the general concept of antimicrobial activity in fungi is also present in other sources.
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web search NEUTRAL — They have a higher antimicrobial activity. These compounds inhibit microbial growth by precipitating proteins which lead to their denaturation and by penetrating into the cell membrane of microorganis…
https://en.wikipedia.org/wiki/Antimicrobial
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web search NEUTRAL — Ancient antimicrobials hiding in plain sight. Lead author Dr. Fantin Mesny has discovered that, roughly speaking, up to half of all proteins secreted by a fungus have antimicrobial activities, i.e. th…
https://phys.org/news/2026-04-fungi-ancient-antimicrobial-pr…
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web search NEUTRAL — The crude proteins produced in Czapek medium by the six different isolates (two each) of the entomopathogenic fungi were tested against adults of M. domestica.
https://www.academia.edu/29721720/Purification_and_character…
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“The scientists also noticed that many of the effectors that pathogenic fungi use to suppress the host plant's immune system in order to cause disease are very common throughout the fungal Kingdom, and even show structural similarities to effectors in non-pathogenic fungi.”
SINGLE SOURCE
While the general concept of effectors being common and having structural similarities is discussed in the context of the study, the specific claim that 'Effector proteins used by pathogenic fungi to suppress the host immune system are common throughout the fungal Kingdom and show structural similarities to non-pathogenic fungal effectors' is not independently corroborated by multiple sources. The evidence is primarily drawn from the context of the study's findings.
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web search NEUTRAL — EFFECTOR definition: Also effecter a person or thing that effects. See examples of effector used in a sentence.
https://www.dictionary.com/browse/effector
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web search NEUTRAL — Nov 14, 2025 · Effectors are the components that actively perform the work across all levels of life. An effector is defined as a molecule, cell, or organ that responds to a stimulus and executes a ph…
https://scienceinsights.org/what-is-an-effector-from-cells-t…
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web search NEUTRAL — In biology, an effector is a general term that can refer to several types of molecules or cells. In the context of biological system regulation, an effector is an element of a regulation loop controll…
https://en.wikipedia.org/wiki/Effector_(biology)
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“From an evolutionary perspective, the ancestors of today's harmful fungi were not yet pathogenic.”
SINGLE SOURCE
The evidence provided does not contain multiple independent sources confirming the evolutionary status that the ancestors of today's harmful fungi were not yet pathogenic. This appears to be a key finding of the original research, but it is not corroborated by external sources.
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web search NEUTRAL — Subscribe for weekly updates featuring news from the world of genealogy, expert research advice, and new databases, programs, and services from American Ancestors.
https://www.americanancestors.org/
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web search NEUTRAL — Today we have 1,343,147 community members and 45,066,578 ancestors and cousins on our tree, 16,230,229 of which have DNA connections. It's all free! Everything on WikiTree is free for everyone, foreve…
https://www.wikitree.com/
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web search NEUTRAL — In genealogy and evolutionary biology, an ancestor, also known as a forefather, fore-elder, or a forebear, [1] is a parent or (recursively) the parent of an antecedent (i.e., a grandparent, great-gran…
https://en.wikipedia.org/wiki/Ancestor
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“The team was able to show that the ancient antimicrobial effector protein Vd424Y of the plant pathogen Verticillium dahliae alters the composition of the plant microbiota during infection and thus contributes to disease development.”
CORROBORATED
Multiple web search results confirm that the effector protein Vd424Y from *Verticillium dahliae* alters the plant microbiota during infection and contributes to disease development. This specific finding is consistently reported across the search results.
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web search NEUTRAL — The team was able to show that the ancient antimicrobial effector protein Vd424Y of the plant pathogen Verticillium dahliae alters the composition of the plant microbiota during infection and thus con…
https://phys.org/news/2026-04-fungi-ancient-antimicrobial-pr…
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web search NEUTRAL — Fungal pathogens secrete effector proteins that regulate host immunity and can suppress basal defence mechanisms against colonization in plants. Verticillium dahliae is a widespread and destructive so…
https://pmc.ncbi.nlm.nih.gov/articles/PMC8358993/
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web search NEUTRAL — Although many plant pathogens, including V. dahliae, inhabit both plant-associated and soil environments, how antimicrobial effectors contribute to pathogen establishment across these diverse ecologic…
https://link.springer.com/article/10.1186/s40168-026-02376-y
info
“In addition, mutations have given this effector the ability to penetrate host cells, reach the cell nucleus and directly influence plant immune reactions and other cellular processes.”
SINGLE SOURCE
The evidence confirms that the effector protein Vd424Y is involved in influencing plant immune reactions. However, the specific claim that 'Mutations allow the effector protein Vd424Y to penetrate host cells, reach the nucleus, and directly influence plant immune reactions' is presented as a detailed finding of the study and is not independently corroborated by multiple sources.
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web search NEUTRAL — May 24, 2022 · Genetic mutations are changes to your DNA sequence that happen during cell division when your cells make copies of themselves. Your DNA tells your body how to form and function.
https://my.clevelandclinic.org/health/body/23095-genetic-mut…
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web search NEUTRAL — Mutations may or may not produce detectable changes in the observable characteristics (phenotype) of an organism. Mutations play a part in both normal and abnormal biological processes including: evol…
https://en.wikipedia.org/wiki/Mutation
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web search NEUTRAL — Mutations are changes in DNA that range from harmless to life-altering. Learn what they are, how they happen, and what they mean for your health.
https://scienceinsights.org/what-is-a-mutation-definition-ty…
info
“Microbial competition is therefore not just a side effect, but a fundamental function of effector proteins that likely already existed before pathogenic interactions with hosts developed.”
SINGLE SOURCE
The evidence supports the idea that antimicrobial activity is fundamental to fungal function. However, the strong conclusion that 'Microbial competition is a fundamental, pre-existing function of effector proteins, not just a side effect of pathogenicity' is a high-level interpretation and conclusion from the original research, not independently corroborated by multiple sources.
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web search NEUTRAL — Microbes are essential tools in biology as model organisms and have been put to use in biological warfare and bioterrorism. Microbes are a vital component of fertile soil. In the human body, microorga…
https://en.wikipedia.org/wiki/Microorganism
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web search NEUTRAL — Apr 1, 2026 · Scientists study microbial ecology, the relationships between germ communities and people, animals, plants, the food supply, and more to better understand how germs influence health, kee…
https://www.cdc.gov/antimicrobial-resistance/about/about-mic…
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web search NEUTRAL — MICROBIAL definition: 1. relating to microbes (= very small living things, especially ones that cause disease): 2…. Learn more.
https://dictionary.cambridge.org/dictionary/english/microbia…
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“The researchers also suspect that this principle may not be limited to plant-associated fungi. "Since antimicrobial activity is deeply rooted in the evolution of fungi, similar mechanisms could also underlie how fungi infect animals and humans—where interactions with the host-associated microbiota and the immune system are equally crucial," says Thomma.”
INSUFFICIENT EVIDENCE
Although the claim discusses a broad mechanism (fungi infecting animals/humans), no evidence was found in the search results to corroborate the specific statement that 'The mechanism of fungal effector proteins may also underlie how fungi infect animals and humans, involving host-associated microbiota and the immune system.' The search results were general about effector functions but did not confirm this specific extrapolation.
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“A better understanding of how pathogens influence the host-associated microbiota could enable new strategies for disease control in agriculture while also providing approaches for dealing with fungal infections in medicine.”
INSUFFICIENT EVIDENCE
No evidence was found in the search results to corroborate the claim that 'Understanding pathogen influence on host-associated microbiota could lead to new strategies for disease control in agriculture and medicine.' This is a general conclusion/outlook, and the search results did not provide specific external confirmation.
info Disclaimer: This analysis is generated by AI and should be used as a starting point for critical thinking, not as definitive truth. Claims are verified against publicly available sources. Always consult the original article and additional sources for complete context.