Ancient Bacteria Resistant to Modern Antibiotics Discovered in Romanian Ice Cave

Deep within Romania’s Scarisoara Ice Cave, a remarkable discovery is shedding light on the ancient origins of antibiotic resistance. Scientists have identified a bacterial strain, entombed in 5,000-year-old ice, that exhibits resistance to 10 commonly used modern antibiotics.

A Frozen Time Capsule

Scarisoara cave harbors one of the world’s largest underground glaciers, a massive ice formation that began developing around 13,000 years ago. This glacier acts as a natural archive, preserving microbial life and offering a glimpse into Earth’s distant past. Researchers extracted a 25-meter ice core from the cave’s Great Hall, representing 13,000 years of frozen history, with the analyzed sample originating from a 5,000-year-old layer. CNN

Psychrobacter SC65A.3: A Resistant Strain

The bacterial strain, named Psychrobacter SC65A.3, was isolated and analyzed. It demonstrated resistance to 10 antibiotics, including trimethoprim, clindamycin, and metronidazole, which are used to treat various bacterial infections. CNN This finding suggests that antibiotic resistance is not solely a modern phenomenon driven by antibiotic overuse, but rather an ancient evolutionary characteristic.

Evolutionary Roots of Resistance

“Ancient bacteria can resist modern antibiotics as antibiotic resistance is an ancient evolutionary characteristic that was shaped over millions of years by competition between microbes,” explained Cristina Purcarea, a senior scientist at the Institute of Biology Bucharest of the Romanian Academy, and senior author of the study published in Frontiers in Microbiology. CNN Bacteria have long shared genetic material, including resistance genes, through horizontal gene transfer, even between unrelated species, creating an “evolutionary arms race.” CNN

Implications for Modern Medicine

While Psychrobacter SC65A.3 is not known to infect humans, the discovery has significant implications for the fight against antibiotic-resistant superbugs. The research highlights how modern antibiotic use may accelerate the spread of resistance based on mechanisms that existed naturally long before the development of these drugs. CNN

Potential for New Drug Discovery

Interestingly, analysis of the Psychrobacter SC65A.3 genome revealed 11 genes with the potential to inhibit the growth of other bacteria, fungi, and viruses. Discover Magazine This suggests that ancient bacteria could be a source of novel compounds for developing new antibiotics. Matthew Holland, a postdoctoral researcher at the University of Oxford, noted the importance of exploring extreme environments like ice caves and the seafloor for potential antibiotic candidates. CNN

A Warming World and Emerging Risks

As global temperatures rise and glaciers melt, ancient microbes like Psychrobacter SC65A.3 are being released into the environment. Discover Magazine While most are likely harmless, some could carry antibiotic resistance genes or other unknown biomolecules that could impact current ecosystems. CNN Researchers are also studying the risks of reviving ancient viruses from thawing permafrost. CNN

Key Takeaways

• A 5,000-year-old bacterial strain discovered in a Romanian ice cave is resistant to 10 modern antibiotics.
• Antibiotic resistance is an ancient phenomenon, predating the widespread use of antibiotics.
• Ancient bacteria may hold clues for developing new antibiotics.
• Melting glaciers and ice caves pose a risk of releasing ancient microbes into the environment.