Researchers at the University of Queensland have identified a mutation in E. coli bacteria that can lead to severe human diseases, shedding light on the link between mutation, bacterial behavior, and antibiotic resistance. The mutation affects the cellulose production machinery of the bacteria, allowing them to spread more aggressively in the body, causing infections in organs like the liver, spleen, and brain.
This discovery clarifies why certain E. coli strains can pose significant health risks, such as sepsis, neonatal meningitis, and UTIs, while others remain harmless.
What is antibiotic resistance?
Antibiotic resistance arises when bacteria evolve mechanisms to evade or deactivate antibiotics designed to kill them. Overuse and misuse of antibiotics in healthcare and agriculture have accelerated resistance among bacterial pathogens. Alarmingly, antibiotic-resistant infections are increasing worldwide – posing threats in communities, hospitals, and food systems.
The World Health Organization estimates antibiotic resistance causes nearly 5 million illnesses and over 600,000 deaths annually. In 2019, bacterial antimicrobial resistance directly caused 1.27 million deaths globally. By 2050, drug-resistant diseases could claim 10 million lives per year and cost the global economy $100 trillion if decisive action is not taken.
Escherichia coli (E. coli) is a significant pathogen in this context, dominating global antimicrobial resistance-related deaths in urinary tract infections (UTIs) due to its resistance to various antibiotic classes like fluoroquinolones, and third-generation cephalosporins. E. coli alone causes more than 1 million infections annually in the U.S. Strikingly, nearly 65% of E. coli samples from human infections and over 80% from poultry are now resistant to at least one antibiotic. Some strains of E. coli have even acquired resistance to carbapenems – considered the “antibiotics of last resort.” E. coli’s dominance as a resistant pathogen highlights the urgent need for tailored strategies to address this challenge.
Importance of cellulose production in bacteria:
Cellulose production in bacteria plays a crucial role in various aspects of bacterial physiology and interactions.
Here are the key points regarding the significance of cellulose production in bacteria:
Biofilm Formation:
-Cellulose is a vital component of biofilms, providing stability and rigidity to the extracellular matrix, aiding in surface colonization, and forming a rigid structure known as “bacterial wood“
-Bacterial cellulose synthesis is correlated with biofilm formation, contributing to the stability of bacterial cell membranes
Host-Pathogen Interactions:
-Cellulose production influences host-pathogen interactions, distinguishing harmful bacteria from benign ones and affecting their ability to trigger inflammatory responses in the host
-In plant pathogens like Agrobacterium tumefaciens and Dickeya dadantii, cellulose aids in the colonization of plant surfaces
Bacterial Survival Strategies:
-Cellulose production is part of bacterial survival strategies, helping bacteria persist in various environments, including the rhizosphere and phyllosphere
-Bacterial cellulose has been shown to protect bacteria from treatments like chlorine
Other Bacterial Species:
Besides E. coli, other bacterial genera capable of producing cellulose include Gluconacetobacter, Agrobacterium, Azotobacter, Rhizobium, Sarcina, Alcaligenes, and Pseudomonas. Cellulose biosynthesis is also documented in a wide variety of bacteria, from thermophilic cyanobacteria to gastrointestinal pathogens like Salmonella enterica.
Cellulose Production is a key factor in bacterial virulence and host interactions
The ability to produce cellulose distinguishes harmful bacteria from benign ones, influencing their ability to trigger inflammatory responses in the host and breach the intestinal barrier. Through their research, the team demonstrated that the absence of cellulose production increased the virulence of the bacteria, leading to more severe diseases like meningitis and UTIs. Understanding how bacteria transition from intestinal colonies to systemic infections is crucial for infection prevention and management.
The collaborative efforts of research teams from the University of Queensland and Griffith University have shed light on the mechanisms underlying bacterial virulence and the emergence of highly invasive strains. Published in Nature Communications, this research contributes significantly to combating the global threat of antibiotic-resistant superbugs by exploring innovative strategies for preventing E. coli infections.
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