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Self‑replicating circular RNA persists in extreme environments: Insights from hot spring microbiomes

Phys · · 348 words · By University

Researchers at the University of Tsukuba have reported the discovery of a previously unknown self-replicating circular RNA in a high-temperature hot spring environment. This novel RNA is distinct from previously known linear RNA viruses and suggests that the diversity of circular RNA replicons is much greater than previously understood. The findings expand knowledge regarding RNA-based replication systems in extreme environments and their potential role in early life history.

open_in_new Read the original article: https://phys.org/news/2026-04-selfreplicating-circular-rna-persists-extreme.html

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Propaganda Score
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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 7
info Single Source 2
help Insufficient Evidence 1
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“Although the genetic material of most living organisms is DNA, various self-replicating agents rely instead on RNA, including RNA viruses and viroids, which are infectious RNA molecules that are smaller and structurally simpler than RNA viruses.”
CORROBORATED
The claim that some self-replicating agents use RNA instead of DNA is supported by general biological knowledge found in the evidence. Specifically, the evidence mentions viroids are infectious RNA molecules, and the general context of the search results discusses RNA viruses and viroids as agents using RNA. This is corroborated by the general scientific understanding presented across multiple web search snippets.
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wikipedia NEUTRAL — In molecular biology, RNA polymerase (abbreviated RNAP or RNApol), or more specifically DNA-directed/dependent RNA polymerase (DdRP), is an enzyme that catalyzes the chemical reactions that synthesize…
https://en.wikipedia.org/wiki/RNA_polymerase
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wikipedia NEUTRAL — Deoxyribonucleic acid (; DNA) is a polymer composed of two polynucleotide chains that coil around each other to form a double helix. The polymer carries genetic instructions for the development, funct…
https://en.wikipedia.org/wiki/DNA
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wikipedia NEUTRAL — Helicases are a class of enzymes that are vital to all organisms. Their main function is to unpack an organism's genetic material. Helicases are motor proteins that move directionally along a nucleic …
https://en.wikipedia.org/wiki/Helicase
+ 3 more evidence sources
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“Researchers at University of Tsukuba have reported a previously unknown self-replicating circular RNA in a high-temperature hot spring environment.”
CORROBORATED
Multiple web search results directly state that researchers at the University of Tsukuba reported identifying a previously unknown self-replicating circular RNA in a high-temperature hot spring environment. This is reported across different search results, indicating corroboration.
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wikipedia NEUTRAL — Mason-Pfizer monkey virus (M-PMV), formerly Simian retrovirus (SRV), is a species of retroviruses that usually infect and cause a fatal immune deficiency in Asian macaques. The ssRNA virus appears sp…
https://en.wikipedia.org/wiki/Mason-Pfizer_monkey_virus
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wikipedia NEUTRAL — TERC may refer to: Telomerase RNA component, a human gene. TERC (Cambridge, Massachusetts), a nonprofit research and development organization in Cambridge, Massachusetts, the developers of the Invest…
https://en.wikipedia.org/wiki/TERC
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wikipedia NEUTRAL — Zsolt Radák (born 1961) is a Hungarian exercise physiologist, academic, and researcher. He currently serves as the Vice-Rector for Innovation and Science at the Hungarian University of Sports Science …
https://en.wikipedia.org/wiki/Zsolt_Radák
+ 3 more evidence sources
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“Previously, self-replicating RNAs identified in high-temperature environments were predominantly RNA viruses with linear genomes.”
CORROBORATED
Two separate web search results explicitly state that previously identified self-replicating RNAs in high-temperature environments were predominantly RNA viruses with linear genomes, setting up a contrast with the new findings.
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wikipedia NEUTRAL — Micro ribonucleic acid (microRNA, miRNA, μRNA) are small, single-stranded, non-coding RNA molecules containing 21–23 nucleotides. Found in plants, animals, and even some viruses, miRNAs are involved i…
https://en.wikipedia.org/wiki/MicroRNA
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wikipedia NEUTRAL — The RNA world is a hypothetical stage in the evolutionary history of life on Earth in which self-replicating RNA molecules proliferated before the evolution of DNA and proteins. The term also refers t…
https://en.wikipedia.org/wiki/RNA_world
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wikipedia NEUTRAL — Ribosomal ribonucleic acid (rRNA) is a type of non-coding RNA which is the primary component of ribosomes, essential to all cells. rRNA is a ribozyme which carries out protein synthesis in ribosomes. …
https://en.wikipedia.org/wiki/Ribosomal_RNA
+ 3 more evidence sources
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“However, the newly identified RNA is a replicating circular RNA that is distinct from known linear RNA viruses.”
CORROBORATED
The claim that the newly identified RNA is a circular RNA distinct from known linear RNA viruses is directly supported by the web search results that contrast the new finding with previous linear virus findings.
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wikipedia NEUTRAL — Messenger ribonucleic acid (mRNA) is a single-stranded molecule of RNA that corresponds to the genetic sequence of a gene, and is read by a ribosome in the process of synthesizing a protein. mRNA is c…
https://en.wikipedia.org/wiki/Messenger_RNA
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wikipedia NEUTRAL — The RNA world is a hypothetical stage in the evolutionary history of life on Earth in which self-replicating RNA molecules proliferated before the evolution of DNA and proteins. The term also refers t…
https://en.wikipedia.org/wiki/RNA_world
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wikipedia NEUTRAL — Transfer ribonucleic acid (tRNA), formerly referred to as soluble ribonucleic acid (sRNA), is an adaptor molecule composed of RNA, typically 76 to 90 nucleotides in length (in eukaryotes). In a cell, …
https://en.wikipedia.org/wiki/Transfer_RNA
+ 3 more evidence sources
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“The work is published in Nature Communications.”
SINGLE SOURCE
Only the cross-reference evidence cites publication in Nature Communications. While this is a specific publication detail, the evidence provided is limited to cross-references, and no other source confirms this specific publication detail.
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cross reference SUPPORTS — The research is published in the journal Nature Communications.
https://phys.org/news/2026-04-deadly-thresholds.html
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cross reference SUPPORTS — In a study led by Georgia Tech published in Nature Communications, researchers learned how to use a similar mechanism to control the movements of artificial protein networks without relying on ATP-pow…
https://phys.org/news/2026-04-muscle-synthetic-cells.html
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cross reference SUPPORTS — The findings, published in Communications Biology, suggest that repeated mental practices can activate biological pathways linked to brain flexibility, immune function, metabolism, and natural pain re…
https://www.euronews.com/health/2026/04/08/just-seven-days-o…
+ 1 more evidence source
info
“The research team had previously identified a highly unusual RNA virus in a high-temperature hot spring ecosystem.”
SINGLE SOURCE
The evidence provided only contains general links to ResearchGate and Pew Research Center, which do not confirm the specific claim that the research team previously identified an unusual RNA virus in a high-temperature hot spring ecosystem. The web search results are too general to confirm this specific historical finding.
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web search NEUTRAL — Access 160+ million publication pages and connect with 25+ million researchers. Join for free and gain visibility by uploading your research.
https://www.researchgate.net/
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web search NEUTRAL — Find the research you need | With 160+ million publication pages, 1+ million questions, and 25+ million researchers, this is where everyone can access science
https://www.researchgate.net/search/publications
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web search NEUTRAL — Pew Research Center is a nonpartisan, nonadvocacy fact tank that informs the public about the issues, attitudes and trends shaping the world.
https://www.pewresearch.org/
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“In the new study, this research was extended by searching for distinct types of self-replicating RNAs in a similar extreme environment, and a novel circular RNA replicon was identified within the microbial community inhabiting the hot spring.”
CORROBORATED
Two web search results confirm that the new study extended previous work by identifying a novel circular RNA replicon within the hot spring's microbial community. The mention of 'hot spring Obelisks' in the evidence further supports this novel discovery in the hot spring environment.
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web search NEUTRAL — These newly identified elements, called hot spring Obelisks, share key structural features with previously known members. They are about 1 kilobase in length and form rod like shapes due to extensive …
https://www.rna-seqblog.com/circular-rna-replicons-discovere…
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web search NEUTRAL — Their RNA sequences are entirely novel, and their placement within the tree of life remains uncertain as they do not appear to have a shared ancestry with any other life form, virus, or viroid. Obelis…
https://en.wikipedia.org/wiki/Obelisk_(biology)
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web search NEUTRAL — In the new study, this research was extended by searching for distinct types of self-replicating RNAs in a similar extreme environment, and a novel circular RNA replicon was identified within the micr…
https://phys.org/news/2026-04-selfreplicating-circular-rna-p…
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“This RNA shows profound divergence from previously known circular RNAs at the nucleotide sequence level, constituting a new lineage that shares a key protein fold with established circular RNA replicons.”
CORROBORATED
Two web search results support the idea that the newly discovered circular RNA shows divergence from known circular RNAs while sharing structural features (key protein fold) with established replicons. This suggests a novel lineage.
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wikipedia NEUTRAL — The RNA world is a hypothetical stage in the evolutionary history of life on Earth in which self-replicating RNA molecules proliferated before the evolution of DNA and proteins. The term also refers t…
https://en.wikipedia.org/wiki/RNA_world
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wikipedia NEUTRAL — RNA-Seq (short for RNA sequencing) is a next-generation sequencing (NGS) technique used to quantify and identify RNA molecules in a biological sample, providing a snapshot of the transcriptome at a sp…
https://en.wikipedia.org/wiki/RNA-Seq
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wikipedia NEUTRAL — Messenger ribonucleic acid (mRNA) is a single-stranded molecule of RNA that corresponds to the genetic sequence of a gene, and is read by a ribosome in the process of synthesizing a protein. mRNA is c…
https://en.wikipedia.org/wiki/Messenger_RNA
+ 3 more evidence sources
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“Furthermore, by using this newly discovered circular RNA as a reference to survey public sequence databases, the researchers found that the diversity of circular RNA replicons is far greater than previously recognized.”
CORROBORATED
Two web search results confirm that surveying public sequence databases using the new circular RNA reference revealed a greater diversity of circular RNA replicons than previously known.
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web search NEUTRAL — The contigs assembled through de novo assembly were used for circular RNA prediction. After removing sequences with low coverage, those that were too short, and duplicated sequences, the predicted sec…
https://pmc.ncbi.nlm.nih.gov/articles/PMC12443047/
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web search NEUTRAL — Furthermore, by using this newly discovered circular RNA as a reference to survey public sequence databases, the researchers found that the diversity of circular RNA replicons is far greater than prev…
https://phys.org/news/2026-04-selfreplicating-circular-rna-p…
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web search NEUTRAL — RNA sequencing reveals diverse circular RNA replicons in hot spring microbes, expanding understanding of Obelisk elements and their role in microbial ecosystems...Databases. Expression and Quantificat…
https://www.rna-seqblog.com/circular-rna-replicons-discovere…
help
“Syun-ichi Urayama et al, Identification of hot spring Obelisk-like RNA replicons and expanded diversity of the Obelisk superfamily, Nature Communications (2026). DOI: 10.1038/s41467-026-71096-6”
INSUFFICIENT EVIDENCE
No evidence was gathered for this claim, and the evidence count confirms no relevant information was found.
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.