Navigation Links
NIH scientists track evolution of a superbug
Date:3/17/2014

Using genome sequencing, National Institutes of Health (NIH) scientists and their colleagues have tracked the evolution of the antibiotic-resistant bacterium Klebsiella pneumoniae sequence type 258 (ST258), an important agent of hospital-acquired infections. While researchers had previously thought that ST258 K. pneumoniae strains spread from a single ancestor, the NIH team showed that the strains arose from at least two different lineages. The investigators also found that the key difference between the two groups lies in the genes involved in production of the bacterium's outer coat, the primary region that interacts with the human immune system. Their results, which appear online in Proceedings of the National Academy of Sciences, promise to help guide the development of new strategies to diagnose, prevent and treat this emerging public health threat.

ST258 K. pneumoniae is the predominant cause of human infections among bacteria classified as carbapenem-resistant Enterobacteriaceae (CRE), which kill approximately 600 people annually in the United States and sicken thousands more. Most CRE infections occur in hospitals and long-term care facilities among patients who are already weakened by unrelated disease or have undergone certain medical procedures. In the new study, scientists from the NIH's National Institute of Allergy and Infectious Diseases (NIAID) and their colleagues sequenced the complete genomes of ST258 K. pneumoniae strains collected from two patients in New Jersey hospitals. By comparing these reference genomes with gene sequences from an additional 83 clinical ST258 K. pneumoniae isolates, the scientists found that the strains divided broadly into two distinct groups, each with its own evolutionary history. Further analysis revealed that most differences between the two groups occur in a single "hotspot" of the genome containing genes that produce parts of the bacterium's outer shell. The investigators plan to further study how these genetic differences may affect the bacterium's ability to evade the human immune system.

The findings from this study highlight the wealth of information that can be gained from genome sequencing. They also demonstrate the importance of sequencing to the surveillance and accurate tracking of bacterial spread. Study collaborators included NIAID-funded scientists from Public Health Research Institute and New Jersey Medical School-Rutgers University, as well as researchers from Case Western Reserve University, the Houston Methodist Research Institute and Hospital System and NIAID's Rocky Mountain Laboratories, where the comparative genome sequencing took place.


'/>"/>

Contact: Ken Pekoc
kpekoc@niaid.nih.gov
301-402-1663
NIH/National Institute of Allergy and Infectious Diseases
Source:Eurekalert

Related medicine news :

1. Scientists solving the mystery of human consciousness
2. Scientists uncover multiple faces of deadly breast cancer
3. Scientists identify major source of cells defense against oxidative stress
4. Scientists tailor cell surface targeting system to hit organelle ZIP codes
5. Scientists rewrite rulebook on breast cancer in landmark global study
6. Warwick scientists uncover how checkpoint proteins bind chromosomes
7. NIH scientists link quickly spreading gene to Asian MRSA epidemic
8. Joslin scientists identify important mechanism that affects the aging process
9. Scripps Research scientists show how memory B cells stay in class to fight different infections
10. Scientists Map Melanomas Genome
11. A*STAR scientists discover switch to boost anti-viral response to fight infectious diseases
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:3/29/2017)... ... March 29, 2017 , ... The Professional ... it has enlisted New York City-based sports and entertainment marketing firm Leverage Agency ... sponsorship opportunities for the Professional Squash Association (PSA), which includes first-time ever title ...
(Date:3/29/2017)... ... March 30, 2017 , ... Sublime Naturals and its founder, Kathy ... "Wonder Spice", it has been used for thousands of years. , "The West has ... author of " Turmeric: How to Use it For Your Wellness. Overcome Inflammation, Enemy ...
(Date:3/29/2017)... ... March 29, 2017 , ... ... provides insight into the challenges employers face in trying to balance both short-term ... employee benefits programs? Adding to the growing complexity, companies are finding that ...
(Date:3/29/2017)... ... March 29, 2017 , ... ... documenting and diagramming network and data center assets and audio-video devices has recently ... request new equipment shapes for free and download shapes and stencils from ...
(Date:3/29/2017)... ... March 29, 2017 , ... Immunotherapy has emerged as one of ... and is touted to be the next revolution in our fight against this complex ... the form of immune checkpoint inhibitors such as PD-1 and PD-L1 inhibitors. , While ...
Breaking Medicine News(10 mins):
(Date:3/29/2017)... Calif. , March 29, 2017  Designers of ... significantly reduce solution size by 50% and extend battery ... ) power management integrated circuit (PMIC) from Maxim Integrated ... PMIC supports a low input voltage of just 0.7V ... Air and Silver Oxide, as well as the more ...
(Date:3/29/2017)... , March 29, 2017  NuVasive, Inc. (NASDAQ: ... transforming spine surgery with minimally disruptive, procedurally-integrated solutions, ... 510(k) clearance of the CoRoent® Small Interbody™ System ... levels in the cervical spine. This marks the ... be used at up to four contiguous levels. ...
(Date:3/29/2017)... HEIGHTS, Utah , March 29, 2017 /PRNewswire/ ... ) announced today the appointment of Cynthia ... Operations.  Cyndi will be responsible for leading Dynatronics ... organization and will report to Dynatronics, CEO ... Cyndi,s appointment concludes an extensive search process conducted ...
Breaking Medicine Technology: