Navigation Links
Biofilm reorganization: Back to the theoretical drawing board
Date:3/22/2011

HOUSTON -- (March 21, 2011) -- In a surprising new study, researchers using image-analysis methods similar to those employed in facial-recognition software have made a startling discovery that rules out the two main theories scientists had created to explain how bacteria self-organize into multicellular aggregate mounds. The study by researchers from Rice University and the University of Georgia appears online this week in the Proceedings of the National Academy of Sciences.

The find is important for the study of biofilms -- slimy colonies of bacteria that form on everything from teeth to pacemakers. Federal health officials have estimated that as many as 80 percent of all microbial infections arise from biofilms, and scientists know that the same bacteria can be up to 1,000 times more resistant to antibiotics if they're living inside a biofilm rather than living on their own. To better fight biofilms, scientists have been scrambling to understand the biochemical and biophysical mechanisms that allow bacteria to form aggregates, reorganize and interact.

"The results of our analysis were really surprising," said study co-author Oleg Igoshin, assistant professor in bioengineering at Rice. "Our results didn't support either of the major competing theories people have come up with. Those theories were each predicated on the idea that as the bacterial mounds were forming and reorganizing, the individual bacterium were drawn toward one or another of them by some sort of chemical signal.

"That doesn't appear to be the case at all," Igoshin said. "We didn't find any neighbor-related factors between the groups at all. Instead, there seems to be a signaling mechanism within the group itself that trumps everything else."

The study involved the bacterium Myxococcus xanthus, a common soil bacteria that's often studied for its ability to self-organize into various patterns. In the wild, M. xanthus are content to collectively hunt other bacteria. But when food is scarce, they stream together into aggregates containing up to 100,000 cells and form spores. The resulting aggregate mounds are large enough to be carried away to better environs by the wind or passing insects.

To study this behavior in the lab, Igoshin and Rice co-authors postdoctoral fellow Chunyan Xie and graduate student Haiyang Zhang created a computer program that could analyze thousands of still frames from microcinematic movies of M. xanthus. The movies were created in the laboratory of University of Georgia collaborator and co-author Lawrence Shimkets. The movies showed how M. xanthus streamed together to form "aggregates." One hallmark of the M. xanthus streaming process is that less than half of the aggregates that initially form will survive through the end of the process. The factors that control this ripening are not understood.

In designing their image-analysis application, Igoshin's team had the computer scrutinize every aggregate -- frame-by-frame -- throughout the streaming process. The computer cataloged 33 properties for each aggregate, including things like area, perimeter size,.distance to and size of the nearest neighbor. After all the data were collected, the team ran a statistical analysis to find out if any feature or combination of features could be used to predict which aggregates would eventually win out over their neighbors.

"We found that size mattered most," Igoshin said. "Not size in relation to neighbors, which is something people had previously thought might matter, but size of the aggregate itself. We found that if we answered one question -- is the size of an aggregate beyond a certain threshold -- then we could accurately predict whether the aggregate would survive with 90 percent accuracy."

Igoshin said some of the image analysis methodologies that the team applied to study M. xanthus are similar to ones that Chunyan Xies used for facial recognition analyses in her previous work. He said scientists have only recently begun to apply these sorts of image analysis techniques to fundamental biological questions like bacterial self-organization.

"One of the most exciting aspects of this study is the fact that we can apply these methods much more broadly to study self-organization in other bacteria and unicellular organisms," Igoshin said. "In fact, this kind of analysis is sorely needed, because most of the existing methods to study these phenomena are qualitative rather than quantitative. As a discipline, we need quantitative methods if we want to conduct side-by-side comparisons between real-world and computer-generated results."


'/>"/>
Contact: Jade Boyd
jadeboyd@rice.edu
713-348-6778
Rice University
Source:Eurekalert  

Related biology news :

1. Research provides new leads in the case against drug-resistant biofilms
2. Innovotech signs agreement for distribution of its bioFILM PA test in Israel
3. Bacterial biofilms as fossil makers
4. Symposium marks 20th anniversary of Theoretical and Computational Biophysics Group
5. New microscopic life aboard the RMS Titanic
6. Reproductive health: Checkerboard of infertility treatment in Europe
7. Rensselaer researchers to send bacteria into orbit aboard space shuttle Atlantis
8. Orbel Introduces the Board Shielding Wizard
9. Springer editorial board member receives Humboldt Research Award
10. Happy holidays from the groaning board; Western diets turn on fat genes
11. Dr. William Brody, President of the Salk Institute for Biological Studies, Appointed to GenVaults Board of Directors
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Biofilm reorganization: Back to the theoretical drawing board
(Date:3/18/2016)... 2016 --> --> ... Manned & Unmanned Vehicles, Physical infrastructure and Perimeter Surveillance & ... the border security market and the continuing migration crisis in ... Europe has led visiongain to publish this unique ... --> defence & security companies in the border ...
(Date:3/15/2016)... , March 15, 2016 Yissum ... , the technology-transfer company of the Hebrew University, announced ... of remote sensing technology of various human biological indicators. ... raising $2.0 million from private investors. ... based on the detection of electromagnetic emissions from sweat ...
(Date:3/11/2016)... 2016 http://www.apimages.com ) - --> ... available at AP Images ( http://www.apimages.com ) - ... to produce the new refugee identity cards. DERMALOG will be unveiling ... in Hanover next week.   --> ... used to produce the new refugee identity cards. DERMALOG will be ...
Breaking Biology News(10 mins):
(Date:4/28/2016)... (PRWEB) , ... April 28, 2016 , ... ... Inc., will hold an open house for regional manufacturers at its Maple Grove, ... from Tsugami, Okuma, Hardinge Group, Chiron and Trumpf. Almost 20 leading suppliers ...
(Date:4/27/2016)... , April 27, 2016 ... (CSE: NSK) (OTCPink: NSKQB) ( Frankfurt ... an ihre Pressemitteilung vom 13. August 2015 die ... ihre Finanzen um zusätzliche 200.000.000 Einheiten auf 400.000.000 ... Dollar zu bringen. Davon wurden 157.900.000 Einheiten mit ...
(Date:4/27/2016)... Winnipeg, Manitoba (PRWEB) , ... April 27, 2016 ... ... commercially released for simultaneous preclinical PET (Positron Emission Tomography) and MRI (Magnetic Resonance ... for better understanding disease and testing novel treatments in small animal subjects. Simultaneous ...
(Date:4/26/2016)... ... April 27, 2016 , ... Cameron Cushman ... as an associate in the firm’s Intellectual Property practice group. , Clients turn ... patent applications. He has an electrical engineering and computer engineering background, and experience ...
Breaking Biology Technology: