A global research team has identified “Obelisks,” a new class of viroid-like genetic entities found in the human gut and mouth. These circular RNA structures are distinct from known viruses and viroids, representing a major discovery in microbiome science.
TLDR: Scientists have discovered ‘Obelisks,’ a new category of virus-like entities living within the human microbiome. Found in thousands of RNA datasets, these rod-shaped genetic elements are widespread in human oral and gut bacteria, though their specific impact on human health remains a subject of ongoing investigation by international research teams.
A team of researchers led by Stanford University has identified a previously unknown class of virus-like entities inhabiting the human body. Dubbed “Obelisks,” these genetic elements represent a significant expansion of the known biological universe within the human microbiome. The discovery, published in a recent study, suggests that these entities are widespread, appearing in thousands of samples of human oral and gut bacteria. This finding highlights the vast amount of biological diversity that remains hidden even within well-studied environments like the human digestive system.
The identification of Obelisks was made possible through the use of advanced bioinformatic tools designed to sift through massive amounts of genetic data. The research team, led by Nobel laureate Andrew Fire and graduate student Ivan Zheludev, analyzed approximately 5.4 million datasets of published RNA sequences. This process involved searching for highly symmetrical, rod-like secondary structures within circular RNA molecules that did not match any known biological agents. This large-scale data mining approach allowed the scientists to identify nearly 30,000 distinct types of Obelisks across diverse geographic regions and biological niches.
Obelisks occupy a unique niche between viruses and viroids. Viroids are small, circular RNA molecules that typically infect plants and do not code for proteins, relying entirely on host machinery for replication. Viruses, conversely, are more complex and possess a protective protein coat or envelope. Obelisks are composed of circular RNA like viroids but are significantly larger, typically around 1,000 nucleotides in length. Crucially, they contain genetic instructions for a new class of proteins the researchers named “obulins.” This protein-coding capability is a fundamental shift in the understanding of sub-viral agents, as it suggests a level of functional autonomy previously unseen in such simple genetic structures.
The prevalence of these entities in the human population is striking. According to the study, Obelisks were detected in roughly 7% of human gut microbiome samples and nearly 50% of oral microbiome samples. In some individuals, specific types of Obelisks persisted for over a year, suggesting a stable and long-term relationship with their bacterial hosts. One specific Obelisk was found to be associated with Streptococcus sanguinis, a common bacterium found in dental plaque. This association provides a starting point for understanding how these entities interact with specific microbial species.
This discovery was the result of an international collaboration involving scientists from Stanford, the University of Toronto, and the Polytechnic University of Valencia in Spain. By pooling resources and data, the team was able to confirm that Obelisks are not localized phenomena but are found globally. The sheer diversity and abundance of these elements suggest they have been part of the human microbiome for a long time, hidden in plain sight due to the limitations of previous sequencing technologies and the narrow focus of traditional virology.
The functional role of Obelisks remains the most significant unanswered question in this new field of study. While they do not appear to be traditional viruses that cause immediate disease or kill their bacterial hosts, they likely influence the metabolic pathways or gene expression of the microbes they inhabit. Researchers are now investigating whether Obelisks are beneficial, harmful, or neutral to human health, particularly in the context of inflammatory diseases or dental health. Understanding the evolutionary origins of these entities could provide new insights into the early history of life on Earth and the complex interactions between different forms of genetic material. Future studies will focus on culturing these entities in a laboratory setting to observe their life cycles directly.
Susan Carter serves as a Senior Correspondent for Just Right News, where she leads the network’s comprehensive coverage of Health, Medicine, and Public Policy. With a career dedicated to dissecting the complexities of the American healthcare system, Susan brings a principled perspective to the most pressing debates of the day. Her reporting is characterized by a commitment to individual liberty, fiscal responsibility, and a healthy skepticism of government overreach, making her a vital voice for audiences seeking clarity in an increasingly regulated landscape.
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