Navigation Links
Bacteria's key innovation helps understand evolution
Date:9/21/2012

nt that started in February 1988 and has been ongoing for more than 24 years. The experiment allows Lenski and his students and colleagues to study more than 56,000 generations of bacterial evolution. In terms of generations, it is the longest running evolution experiment in history.

Twelve populations of E. coli live in an incubator in Lenski's laboratory producing about seven new generations every 24 hours. Each day, scientists take one percent of each population and transfer it into a new food source, a flask containing fresh glucose, which the bacteria readily eat, and citrate, which one population discovered how to eat after more than 30,000 generations. The researchers also take samples every 500 generations, and freeze them for later study.

Because they freeze the samples, when something new emerges the scientists can go back to earlier generations to look for the steps that happened along the way, which is what occurred in this case.

The researchers found that at least three mutations were required for the bacteria to effectively use citrate when oxygen is present. One or more mutations were necessary to set the physiological stage for the two later events. Then a critical gene duplication occurred that effectively re-wired the expression of a previously silent gene.

"These bacteria have evolved to consume a food resource--citrate--that no wild E. coli uses. Three mutations are required for this to happen, and they must occur in a specific order," said George Gilchrist, NSF program manager for the BEACON Science and Technology Center. "This study shows that the first mutation is required to set the stage for the next two, but surprisingly, this turns out to occur repeatedly and independently in different populations. What this suggests is that complex traits, at least in the microbial world, can evolve quickly and repeatedly."


'/>"/>

Contact: Bobbie Mixon
bmixon@nsf.gov
703-292-8485
National Science Foundation
Source:Eurekalert  

Page: 1 2

Related biology news :

1. NSF research alliances begin new efforts to accelerate innovation
2. New video series highlights the people who fuel Americas innovation pipeline
3. Security Technology Executive, SIA and ISC East announce Security Innovation Awards Collaboration
4. NSF Leadership in Discovery and Innovation sparks White House US Ignite Initiative
5. ESMO 2012 Congress: A path for medical oncology innovations
6. NineSigma Launches NineSights, the Worlds First Open Innovation Social Media Destination for Innovation Seekers and Solution Providers
7. MADRID-MIT M+Vision Consortium hosts Biomedical Innovation Conference 2012
8. Science, Innovation, and Partnerships for Sustainability -- Symposium May 16-18
9. Inventor honored for bridging innovation and humanitarianism to help millions globally
10. Science means innovation
11. Joint UT study: Reading food labels helps shoppers stay thinner
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Bacteria's key innovation helps understand evolution
(Date:7/11/2014)... German . ... refraction of X-rays through a specimen instead of attenuation ... are often of much higher quality than those based ... Franz Pfeiffer are particularly interested in developing new approaches ... phase-contrast imaging. One main goal is to make this ...
(Date:7/11/2014)... Social animals often develop relationships with other group members ... In wild chacma baboons the strategy for grooming activities ... are just published in the scientific journal Biology ... of baboons is not practiced without ulterior motives. To ... for the individual, while grooming another individual can provide ...
(Date:7/11/2014)... of mesenchymal stem cells can stimulate neurogenesis in the ... disease (AD) and improve tissue and function injury under ... on the therapeutic effect of adipose-derived stem cells (ADSCs) ... on oxidative injury and neurogenesis in the brain of ... of Life Sciences, Tsinghua University, China transplanted ADSCs into ...
Breaking Biology News(10 mins):New simple setup for X-ray phase contrast 2Baboons groom early in the day to get benefits later 2
... BGI, the world,s largest genomic organization, today announced its ... of RNA-Seq in predicting patient outcomes as part of ... U.S. Food and Drug Administration (FDA). The SEQC, also ... MicroArray Quality Control (MAQC), aimed at assessing the technical ...
... upper and lower abdomen is a reliable, minimally invasive way ... indicator of too much male hormone, researchers report. "We ... women that was as non-intrusive and accurate as possible," said ... Sciences University. "We believe this approach is approximately ...
... controlled by the brain from blood pressure to appetite to ... , a team of scientists led by Dr. Gil Levkowitz of ... brain area in which biochemical commands are passed from the brain ... the process, they discovered a surprising new role for the ,hormone ...
Cached Biology News:BGI to play a pivotal role in demonstrating the superior performance of RNA-Seq 2Women's chin, abdomen are good indicators of excessive hair growth 2Women's chin, abdomen are good indicators of excessive hair growth 3A hormone ensures its future 2
(Date:7/10/2014)... Product and process impurities in ... and are often “lost in the noise,” making ... presenters Dr. Rowel Tobias, Senior Scientist, Protein Chemistry ... of Quality at Nanotherapeutics, Inc., to lear about ... detection and quantitation while achieving the required specificity ...
(Date:7/10/2014)... Ohio (PRWEB) July 10, 2014 Understanding ... ion channel-expressing cell lines, and the gap that currently ... cells that expand its industry-leading portfolio of validated ion ... on ion channel-expressing cell lines, as ion channels control ... to control this activity creates the potential to treat ...
(Date:7/10/2014)... San Francisco, CA (PRWEB) July 10, 2014 ... a family closer together. The Archer Family purchased ... information contained within DNA, but ended up with a ... surprising discoveries contained within the family members’ DNA genuinely ... family had decided to search deeper into genetic history ...
(Date:7/10/2014)... 2014 OMICS Group’s 5th International conference ... August, 2014 at Double Tree by Hilton Beijing, China ... in Analytical & Bioanalytical research methods only to facilitate ... this occasion, Dr. Srinubabu Gedela, MD of OMICS Group ... a remarkable one in bringing a unique and international ...
Breaking Biology Technology:Novel Ms Techniques Speed Detection of Biopharmaceutical Product and Process Impurities, New Webinar Hosted by Xtalks 2Leader in Ion Channel Research Announces Newly Validated and Re-Engineered Cells 2Leader in Ion Channel Research Announces Newly Validated and Re-Engineered Cells 3Ancestry DNA Test Reveals a Controversial and Undiscovered Family History 2Ancestry DNA Test Reveals a Controversial and Undiscovered Family History 3Ancestry DNA Test Reveals a Controversial and Undiscovered Family History 4Ancestry DNA Test Reveals a Controversial and Undiscovered Family History 5A Critical Review of Analytical Techniques for Improved Living Standards 2A Critical Review of Analytical Techniques for Improved Living Standards 3A Critical Review of Analytical Techniques for Improved Living Standards 4
... ADVENTRX Pharmaceuticals,Inc. (Amex: ANX ) a biopharmaceutical ... candidates for the treatment,of cancer and infectious diseases, ... officer, is scheduled to present at the 2007,Thomas ... at 1:30 p.m. Eastern Daylight Time. The conference ...
... PXS, Nasdaq: PXSL) today announced that its Phase ... people with bronchiectasis has met its two,primary efficacy ... Data from the 362 subject study demonstrated a ... weeks of treatment with Bronchitol,as assessed by the ...
... SOMERSET, N.J., Aug. 28 DOV Pharmaceutical,Inc. ("DOV" or ... today that its common stock is now being quoted ... common stock is also still,being quoted on the Pink ... common stock are now being quoted,both on the OTC ...
Cached Biology Technology:ADVENTRX Pharmaceuticals to Present at the 2007 Thomas Weisel Partners Healthcare Conference 2Phase III Trial Finds Pharmaxis' Bronchitol Effective 2Phase III Trial Finds Pharmaxis' Bronchitol Effective 3DOV Pharmaceutical, Inc. Begins Trading on OTC Bulletin Board 2
... offers the most comprehensive, cost-effective solution ... have incorporated unprecedented quality into both ... includes proven detection chemistries and antibodies ... TechMate protocol. It also includes our ...
... Resistant (X/R) Red System consists of ... Activator and X/R Red Buffer. The ... phosphatase to produce red staining that ... Contains:, , Buffer, 100 mL , ...
Human Cell Line Slides...
Phospho-YAP (Ser127) Antibody Ship: Hot Store: -20 C...
Biology Products: