Navigation Links
Adaptation to parasites drive African fishes along different evolutionary paths
Date:8/15/2007

Quebec City, Canada - An international team of scientists from Canada (Universit Laval), the U.K. (University of Hull, Cardiff University) and Spain (Do ana Biological Station), have discovered that a pair of closely related species of East African cichlid fishes a group of fish whose diversity comprising hundreds of species has puzzled evolutionary biologists for decades evolved divergent immune gene adaptations which might explain why they do not interbreed, despite living side by side.

The two species ( Pseudotropheus emmiltos and Pseudotropheus fainzilberi ) are found in the north western part of Lake Malawi. Until now, the only known difference between them was the color of their dorsal fin. Many researchers believe that African cichlids recognize conspecifics from these kinds of colour differences, which are thought to result from sexual selection. However, recent mate choice experiments have shown that female P. emmiltos recognize males of their own species from P. fainzilberi males based on olfactory communication rather than color.

Some of the genes known to influence mating behavior through olfaction in other vertebrate species are genes of the major histocompatibility complex (MHC). These genes code for receptor that bound molecules produced by infectious agents and present them to specialized cells of the immune system which then launch an immune attack on the microbes. They are the most diverse genes found in vertebrate genomes and individuals of some species, including humans, are able to "smell" other individuals variability at these genes and adjust their mate choice in order to optimize the effectiveness of their offspring's immune system. Analysis of MHC genes between P. emmiltos and P. fainzilberi revealed that the two species were genetically more different at these sites involved in contacting and presenting molecules to immune cells than at other sites of the gene's DNA sequence that do not play functional roles.'/>"/>

Contact: Jonatan Blais
jonatan.blais.1@ulaval.ca
418-656-213-18455
Public Library of Science
Source:Eurekalert

Page: 1 2

Related biology news :

1. 15 generations of untrained jocks, couch potatoes show big physiological adaptations
2. Otter adaptations: How do otters remain sleek and warm
3. Protein offers way to stop microscopic parasites in their tracks
4. Measuring hidden parasites in falciparum malaria
5. Researchers at UGA provide first look at protein expression in Chagas disease-causing parasites
6. Malaria parasites develop in lymph nodes
7. How healthy is that marsh? Biologists count parasites
8. Bacterial protein shows promise in treating intestinal parasites
9. Hopkins scientists link immune response to ghost parasites and severely congested sinuses
10. Parasites impact goes beyond host to affect ecosystem
11. Scientists identify molecular events that drive cell senescence
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:8/20/2014)... have developed methods for electronically manipulating the flight muscles ... use to control those muscles. The work opens the ... for use in emergency response. , "In the big ... the movement of moths for use in applications such ... an assistant professor of electrical and computer engineering at ...
(Date:8/20/2014)... , Aug. 20, 2014  The second ... place in Tampa, Florida ... sessions with Steven Rahman, Director, Technology and Strategy at ... at Experian. The theme of this year,s event ... Privacy. "Biometrics UnPlugged: Mobility at ...
(Date:8/19/2014)... supermarkets to encourage healthier spending habits? A new study ... question by tracking the purchasing records in a supermarket ... the nutritional value of foods for sale. , The ... PhD, and Brian Wansink PhD, author of Slim by ... Hannaford Supermarkets in the Northeastern United States between January ...
Breaking Biology News(10 mins):Research paves way for development of cyborg moth 'biobots' 2Biometrics UnPlugged: Mobility at the Crossroads of Commerce & Privacy to Feature Interactive Sessions with Samsung and Experian 2
... called ,pestilences, three are historically recognized as due to ... 19th to 21st centuries AD there were microbiological evidences ... pestis . "For a long time scholars from different ... of the past pandemics. Only ancient DNA analyses carried ...
... , May 9, 2013 Wexford Science & ... in the Wake Forest Innovation Quarter , today ... buildings currently underway represents an additional $150 million investment ... Wexford,s total investment in the Innovation Quarter to more ...
... NY and San Diego, CA A large, multi-institutional research ... a sweeping analysis in the current issue of the journal ... off to direct early human development. Led by Bing Ren ... The Salk Institute for Biological Studies and James Thomson of ...
Cached Biology News:Scientists confirm that the Justinianic Plague was caused by the bacterium Yersinia pestis 2Wexford Science & Technology Makes $150 Million Investment in Wake Forest Innovation Quarter 2Wexford Science & Technology Makes $150 Million Investment in Wake Forest Innovation Quarter 3Mapping the embryonic epigenome 2Mapping the embryonic epigenome 3
(Date:8/20/2014)... WriteResult®, a leading provider of Electronic Patient Outcome ... myPROpad™ ePRO tablet with the addition of a touchscreen ... widely used and well-respected Patient Reported Outcome (PRO) instruments ... used during clinical trials and in other health care ... to demonstrate Health-Related Quality of Life outcomes (HRQoL) resulting ...
(Date:8/19/2014)... Shimadzu Scientific Instruments has introduced two ... adding to the company’s extensive line-up of HPLC ... operating environment, and full automation, the i-Series provides ... conventional to ultra-high-speed analysis. , The ... so users can begin building the lab of ...
(Date:8/19/2014)... 2014 Cellgen Diagnostics ... to fund a corporate lab for its genetic-based ... development is a critical component in the move ... the implementation of personalized medicine – a more ... , Indiegogo contributions will support Cellgen’s intent to ...
(Date:8/19/2014)... (PRWEB) August 19, 2014 XenoTech ... fast and cost-effective metabolite production from bioactive small ... chemistry platform, the technology enables convenient and timely ... According to XenoTech’s Vice President of Commercial Operations, ... for assessing clinical risk can be measured directly ...
Breaking Biology Technology:EQ-5D™ Assessment Now Available for iPad 2Shimadzu’s New i-Series Integrated Liquid Chromatography Systems Provide Laboratories Wider Range of Analytical Capabilities 2Shimadzu’s New i-Series Integrated Liquid Chromatography Systems Provide Laboratories Wider Range of Analytical Capabilities 3Cellgen Diagnostics Launches Indiegogo Crowdfunding Campaign for DNA Medical Testing Device 2Cellgen Diagnostics Launches Indiegogo Crowdfunding Campaign for DNA Medical Testing Device 3Beyond Metabolite Identification, Testable Quantities Now Offered by XenoTech 2Beyond Metabolite Identification, Testable Quantities Now Offered by XenoTech 3
... ROCKVILLE, Md., Aug. 3, 2011 Neuralstem, Inc. (NYSE ... U.S. Department of Defense (DOD) contract to develop its ... cancerous brain tumors. The research contract, entitled "Research to ... be carried out in collaboration with Principal Investigator John ...
... Anadys Pharmaceuticals, Inc. (Nasdaq: ANDS ) announced today ... Monday, August 8, 2011, after the U.S. financial markets close. ... on Monday, August 8, 2011, at 5:00 p.m. Eastern Daylight ... highlights.  A live webcast of the call will be available ...
... CAMBRIDGE, Mass., Aug. 2, 2011 Pathogenica, Inc. announced ... is speaking today at the IBC Life Sciences Drug ... During the conference, the only event on the ... development, and patient care, Dr. Doran will speak on ...
Cached Biology Technology:Neuralstem Awarded Department of Defense Contract for Brain Cancer Research 2Neuralstem Awarded Department of Defense Contract for Brain Cancer Research 3Anadys Pharmaceuticals to Report Second Quarter 2011 Financial Results 2Pathogenica CSO Speaks at IBC Life Sciences Drug Discovery & Diagnostic Development Week 2
... enables sensitive, fast and specific detection of ... Short hybridisation time ( ... spreads Multiplex capability Available with ... Probes available with different labels. ...
... Source rat adult and fetal ... $550.00, * T75 plated cells ... * This product requires Celprogen ... M55007-08 and extracellular matrix, * ...
... Isolation Kit provides a rapid method for ... from the various bacterial species found within ... of genomic DNA from both gram negative ... ,Purification is based on spin column ...
...
Biology Products: