The biological kingdom historically known as Monera—now scientifically divided into the distinct domains of Bacteria and Archaea—has been the subject of groundbreaking discoveries between late 2024 and early 2026. While these organisms are microscopic, their impact on medicine, evolution, and environmental science is proving to be monumental. Recent months have seen a surge in research revealing that these single-celled life forms are evolving in real-time to eat human pollution, fighting cancer in novel ways, and providing the “missing link” to the origin of complex life.
The Rise of Plastic-Eating Microbes
One of the most significant environmental stories of late 2025 was the revelation that ocean bacteria are adapting to human pollution faster than anticipated. In November 2025, a global study led by researchers at KAUST (King Abdullah University of Science and Technology) found that 80% of ocean samples contained bacteria with a specific gene motif (M5) on their enzymes, allowing them to digest polyethylene terephthalate (PET) plastic found in bottles and clothing. This suggests a planetary-scale evolutionary response where marine microbes are turning our trash into a carbon source. However, this adaptation has a dark side. A separate May 2025 study found that the hospital pathogen Pseudomonas aeruginosa has also evolved to “eat” plastic. It can degrade and feed on the plastic components of medical devices like catheters and implants, using the material to build stronger, drug-resistant biofilms, posing a new threat to patient safety.
Archaea: The Untapped Antibiotic Reservoir
For decades, scientists looked primarily to fungi and soil bacteria for antibiotics. However, in August 2025, a pivotal study published in PLOS Biology revealed that Archaea might be the next great frontier in fighting drug-resistant disease. Researchers at the MRC Laboratory of Medical Sciences found that many Archaea produce potent “peptidoglycan hydrolases”—enzymes designed specifically to rupture the cell walls of bacteria. Because Archaea do not have peptidoglycan walls themselves, they use these enzymes as chemical weapons to compete with bacteria for resources. This discovery opens the door to a completely new class of antimicrobials derived from Archaea, potentially offering a solution to the global crisis of antibiotic resistance.
Bacteria as “Living Drugs” Against Cancer
The field of oncology saw a major breakthrough in 2025 with the development of “living medicines.” In August 2025, scientists in Japan unveiled a therapy known as AUN, which utilizes a consortium of two bacteria: Proteus mirabilis (which thrives inside tumors) and Rhodopseudomonas palustris (a photosynthetic bacterium). Unlike previous immunotherapies that rely on stimulating the patient’s immune system, the AUN bacteria work in harmony to directly attack the tumor environment, causing necrosis without triggering a dangerous immune overreaction. This “immune-independent” mechanism offers hope for immunocompromised patients who cannot benefit from traditional therapies. Parallel research in China (March 2025) successfully engineered a bacterial strain (“DB1”) that can target tumors while being cleared from healthy tissue, marking a maturing of synthetic biology in medicine.
Asgard Archaea and the Origin of You
Finally, evolutionary biology took a leap forward in 2025 with new insights into Asgard archaea, the group of microbes believed to be the closest living relatives to eukaryotes (humans, plants, and animals). For years, these organisms were known only through DNA fragments. However, recent microscopy has finally revealed their physical structure. Studies published in mid-2025 describe Asgard cells as having complex, elongated shapes with tentacle-like protrusions, physically bridging the gap between simple prokaryotic cells and complex eukaryotic ones. This visual evidence supports the theory that billions of years ago, an Asgard-like archaeon swallowed a bacterium, leading to the first complex cell—an event that eventually gave rise to all plant and animal life.
References
- Strock, R., et al. (2025). Archaea produce peptidoglycan hydrolases that kill bacteria. PLOS Biology.
- King Abdullah University of Science & Technology (KAUST). (2025). Plastic-eating bacteria discovered in the ocean. ScienceDaily / The ISME Journal.
- Iwata, S., et al. (2025). Tumour-resident oncolytic bacteria trigger potent anticancer effects through selective intratumoural thrombosis and necrosis. Nature Biomedical Engineering.
- Gavi, the Vaccine Alliance. (2025). We found a germ that ‘feeds’ on hospital plastic. (Referencing the Pseudomonas study).
- Tobiasson, V., et al. (2025). Dominant contribution of Asgard archaea to eukaryogenesis. bioRxiv.