A strain of Psychrobacter frozen for 5,000 years remains resistant to many potent antibiotics, raising concerns about the emergence of superbugs when the ice melts.
Newly discovered bacteria capable of resisting modern antibiotics are treasures of science and medicine, but they could also ignite new health challenges if humanity is unprepared. - Photo: SciTechDaily.com
Bacteria have always been masters of survival, but their ability to adapt seems to far surpass what humans can imagine.
Recently, a groundbreaking study published in the journal Frontiers in Microbiology on February 20th revealed the existence of the Psychrobacter SC65A.3 strain of bacteria inside the Scarisoara ice cave (Romania). Despite being "imprisoned" in the ice for five millennia, this organism possesses a "weapon" capable of resisting even the most advanced drugs of 21st-century medicine.
A research team led by Dr. Cristina Purcarea from the Bucharest Institute of Biology drilled 25 meters deep into the ice core of the Scarisoara cave to collect samples dating back up to 13,000 years.
The results of sequencing the SC65A.3 strain's genome shocked scientists : it possesses more than 100 genes related to drug resistance.
To verify this, researchers exposed the bacteria strain to 28 different antibiotics belonging to 10 different groups, drugs that are currently medicine's last line of defense.
The results showed that this ancient bacterium was resistant to at least 10 common antibiotics, including familiar names like rifampicin (used to treat tuberculosis), vancomycin, and ciprofloxacin.
"What's remarkable is that this strain of bacteria is resistant to trimethoprim, clindamycin, and metronidazole, drugs commonly used to treat urinary tract, lung, and bloodstream infections," Dr. Purcarea pointed out.
Inside the Scarisoara ice cave in Romania - Photo: Paun VI
This discovery proves a harsh truth: antibiotic resistance is not the only consequence of drug abuse in modern medicine; it has existed and evolved naturally in the environment for thousands of years before humans discovered penicillin.
The presence of these "invincible" ancient bacteria poses a worrying scenario in the context of global warming. As ice caves and permafrost melt, these microorganisms, along with their vast repertoire of antibiotic resistance genes, could be released into the environment, spreading to modern bacteria and exacerbating the global antibiotic resistance crisis.
On the other hand, the Psychrobacter SC65A.3 strain also opens up new hopes for biotechnology. Genomic analysis revealed that it contains nearly 600 genes with previously unknown functions and 11 genes capable of killing or inhibiting other pathogenic bacteria, fungi, and viruses.
"We discovered that this bacterial strain can inhibit the growth of some of today's leading drug-resistant 'superbugs'," added Dr. Purcarea. This suggests that these ancient organisms may hold the key to discovering next-generation antibiotics or unique industrial enzymes for everyday life.