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Deadly bacteria may mimic human proteins to evolve antibiotic resistance
Date:6/1/2011

FLAGSTAFF, Ariz. June 1, 2011 Deadly bacteria may be evolving antibiotic resistance by mimicking human proteins, according to a new study by the Translational Genomics Research Institute (TGen).

This process of "molecular mimicry" may help explain why bacterial human pathogens, many of which were at one time easily treatable with antibiotics, have re-emerged in recent years as highly infectious public health threats, according to the study published May 26 in the journal Public Library of Science (PLoS) One.

"This mimicry allows the bacteria to evade its host's defense responses, side-stepping our immune system," said Dr. Mia Champion, an Assistant Professor in TGen's Pathogen Genomics Division, and the study's author.

Using genomic sequencing, the spelling out of billions of genetic instructions stored in DNA, the study identified several methyltransferase protein families that are very similar in otherwise very distantly related human bacterial pathogens. These proteins also were found in hosts such as humans, mouse and rat.

Researchers found methyltransferase in the pathogen Francisella tularensis subspecies tularensis, the most virulent form of Francisella. Just one cell can be lethal. Methyltransferase is a potential virulence factor in this pathogen, which causes Tularemia, an infection common in wild rodents, especially rabbits, that can be transmitted to humans though bites, touch, eating or drinking contaminated food or water, or even breathing in the bacteria. It is severely debilitating and even fatal, if not treated.

Similar methyltransferase proteins are found in other highly infectious bacteria, including the pathogen Mycobacterium tuberculosis that causes Tuberculosis, a disease that results in more than 1 million deaths annually. The study also identified distinct methyltransferase subtypes in human pathogens such as Coxiella, Legionella, and Pseudomonas.

In general, these bacterial p
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Contact: Steve Yozwiak
syozwiak@tgen.org
602-343-8704
The Translational Genomics Research Institute
Source:Eurekalert

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