Genes usually move through family lines. Parents pass them to offspring, and that is the version of genetics most of us learn first. But nature has messier routes, and a new study reports a rare direct look at one of them.<\/p>\n\n\n\n
Researchers say they have observed RNA from a \u201cjumping gene\u201d moving from a tiny predatory bacterium into cells of another species, its archaeal prey. The twist is important. The prey cells were already dead, so this was not a clean genetic takeover. It was more like catching a burglar inside an empty house.<\/p>\n\n\n\n
A \u201cjumping gene<\/a>\u201d is a piece of genetic material that can move around. These mobile elements are found in bacteria, plants, animals, and humans, and they can sometimes add new traits or change how a cell works.<\/p>\n\n\n\n In simple terms, they are genetic hitchhikers. Some jump within the same genome, while others appear to have crossed between species over evolutionary time. Until now, scientists mostly inferred those jumps by comparing genetic family trees.<\/p>\n\n\n\n The new work focuses on a special kind of jumping gene called an intron. Introns are usually removed from RNA messages before the cell uses those messages, but some introns can cut themselves out and behave like mobile genetic elements.<\/p>\n\n\n\n The discovery came from a slow-growing microbial community that produces methane<\/a> while breaking down limonene, the compound that gives oranges their familiar smell. It sounds almost kitchen-like, but this was a low-oxygen world of bacteria and archaea<\/a>, the single-celled organisms that often thrive in extreme or unusual environments.<\/p>\n\n\n\n Inside that community, one tiny predator stood out. Candidatus Velamenicoccus archaeovorus feeds on other microbes involved in turning limonene into methane and carbon dioxide. Its prey included Methanothrix soehngenii, a filament-forming archaeon linked to methane production.<\/p>\n\n\n\n Earlier research in Applied and Environmental Microbiology had already described sick and dead cells in related Methanosaeta filaments and proposed the predator\u2019s name. That made the new question sharper. Could researchers find a molecular clue from the predator inside its prey?<\/p>\n\n\n\n Jana Kizina, Almud Lonsing, and Jens Harder at the Max Planck Institute for Marine Microbiology in Bremen used highly specific genetic probes to search for tiny amounts of intron RNA. These probes work like molecular searchlights, lighting up a chosen RNA sequence under a microscope.<\/p>\n\n\n\n The team found the intron RNA inside living cells of the predatory bacterium. More surprisingly, they also saw it inside dead cells of Methanothrix soehngenii, the prey. That was the key observation behind the claim that the mobile RNA had crossed from one species into another.<\/p>\n\n\n\n The study also checked older transcriptome data, which is a snapshot of RNA activity in a sample. The amount of intron material was extremely small, roughly one unspliced transcript or intron molecule for every 20,000 mature ribosomal RNA molecules. Tiny signal. Big implication.<\/p>\n\n\n\n So, did the gene successfully invade a new species? Not quite. The researchers saw intron RNA in dead prey cells, not proof that the intron became permanently installed in a living new genome.<\/p>\n\n\n\n That detail matters because genes do not change evolution simply by drifting into a dead cell. For a true long-term genetic transfer, the mobile element would need to enter a suitable host and become copied into its genetic material.<\/p>\n\n\n\n Still, the image is striking. The intron appears to have left its original cell and entered a foreign one. It may have been caught in the act, but the act ended in a biological dead end.<\/p>\n\n\n\n RNA is usually fragile. In living cells, it carries genetic instructions to the cell\u2019s protein-making machinery, then it is quickly broken down. In dead cells, RNA normally does not last long.<\/p>\n\n\n\n This intron was different because it can form a ring-shaped RNA molecule<\/a>. A ring has no loose ends, which makes it harder for the cell\u2019s cleanup enzymes to chew apart. Think of it like a shoelace tied into a loop instead of left frayed.<\/p>\n\n\n\nRead More: The June Bootids meteor shower may seem very faint almost every year, but throughout its history, extremely rare bursts of up to 100 meteors per hour have been recorded, causing many people to look up at the sky<\/a><\/h3>\n<\/div>\n<\/div><\/div>\n<\/div>\n\n\n\n
A predator in an orange scented culture<\/h2>\n\n\n\n
How scientists spotted the leap<\/h2>\n\n\n\n
The jump went nowhere<\/h2>\n\n\n\n
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Why circular RNA survives<\/h2>\n\n\n\n