Researchers at Syracuse University have identified a previously unknown species of amoeba capable of surviving at exceptionally high temperatures, challenging existing assumptions about the thermal boundaries of complex life forms. The organism, designated Incendiamoeba cascadensis, was collected from geothermal waters in Lassen Volcanic National Park in northern California. The amoeba can replicate at temperatures reaching 145°F—approximately five degrees higher than the previous record for eukaryotic organisms—and can continue moving at temperatures up to 147°F while remaining able to protect itself in water as hot as 158°F.
The discovery emerged from a field sampling effort in which researchers used specialized equipment to collect water samples from a tributary of Hot Springs Creek within the park. Upon microscopic examination, researchers observed the characteristic movement patterns of an amoeba and subsequently sequenced its genome, confirming it represented a previously undescribed species. The findings, published in the journal Cell, indicate that the organism possesses genetic and structural adaptations that allow its proteins and cellular membranes to maintain stability at elevated temperatures.
Microbiologist Angela Oliverio contextualized the significance of the discovery by noting that while the five-degree improvement may appear modest, it establishes proof that such thermal resilience is achievable in complex organisms. She drew a parallel to historical athletic achievements, suggesting that once a boundary is demonstrated as permeable, other instances will likely follow. The research team hopes their work will prompt additional investigations into complex organisms existing in extreme environments.
Experts not directly involved in the research acknowledged both the inherent difficulty of translating laboratory discoveries into practical applications and the genuine potential for such findings to yield significant benefits. Possible applications include informing development of heat-resistant crops and creating pharmaceuticals with greater thermal stability. The fire amoeba’s larger genome relative to its thermophilic relatives also suggests it has adopted a distinct evolutionary strategy compared to other extremophile organisms, warranting further investigation into its adaptive mechanisms.
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