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:8/21/2014)... the water window? It consists of radiations in the ... by the water in biological tissues. New theoretical findings ... within the water window. These could be the basis ... of the biological samples or to be used in ... physical mechanism needed to efficiently generate the harmonic radiationswhich ...
(Date:8/21/2014)... A team of researchers at Louisiana Tech ... using affordable, consumer-grade 3D printers and materials ... contain antibacterial and chemotherapeutic compounds for targeted ... doctoral students and research faculty from Louisiana ... collaborated to create filament extruders that can ...
(Date:8/20/2014)... Aug. 20, 2014 George E. Fox, a John and ... of Houston (UH), was named a fellow in the International ... , Fox is one of four members two ... chosen as fellows in 2014. Fellows are elected every ... more than 500 members from more than 20 countries, the ...
Breaking Biology News(10 mins):Water window imaging opportunity 2Louisiana Tech University researchers use 3D printers to create custom medical implants 2Louisiana Tech University researchers use 3D printers to create custom medical implants 3UH professor named fellow by International Astrobiology Society 2
... emphasizes the development of a series of nested environment ... with the individual, and also affect the development of ... is the major source influencing human development, which is ... saw the individual,s experience "as a set of nested ...
... N. Kuggie Vallee Foundation announces, today, the first recipients ... are: Dr. Kirsty L. Spalding, Senior Researcher in ... Karolinska Institutet (Stockholm, Sweden) who studies obesity by investigating ... David Tobin, Assistant Professor of Molecular Genetics and Microbiology ...
... enhance mental energy and well-being not only for healthy ... according to a July 15 panel discussion at the ... Food Expo held at McCormick Place. Bonnie Kaplan, ... University of Calgary, Alberta, Canada, said Monday vitamins and ...
Cached Biology News:
(Date:8/22/2014)... Researchers at the University of Surrey have discovered how ... the body,s clock genes. , The new study, published ... that this clock activity in turn regulates the cycle ... researchers also discovered that the local biological clock and ... importance of the clock in bladder physiology and ageing. ...
(Date:8/22/2014)... investigated for application as catalysts, sensors, drug ... in photonics and molecular electronics. Gaining knowledge ... physical and chemical properties, has been challenging. ... demonstrated that high-resolution electron microscopy can be ... which all gold atoms are observed. The ...
(Date:8/22/2014)... 2014 Research and Markets has ... Gel Permeation Chromatography (GPC) Industry Report 2014" report ... China Gel Permeation Chromatography (GPC) Industry Report is a ... the global gel permeation chromatography industry with a focus ... basic overview of the industry including definitions, classifications, applications ...
(Date:8/22/2014)... Nerium International, the go-to, buzzworthy ... spotlight again. Nerium will showcase its signature NeriumAD® ... Contouring Cream to Hollywood’s elite at the official ... 66th Primetime Emmy® Awards. , Developed from cutting-edge ... trials show that NeriumAD night cream dramatically reduces ...
Breaking Biology Technology:Treatment for overactive bladder and irritable bowel syndrome advanced through pioneering research 2A breakthrough in imaging gold nanoparticles to atomic resolution by electron microscopy 2Global and China Gel Permeation Chromatography (GPC) Industry Report 2014 2Nerium International Joins Television’s Biggest Stars at Backstage Creations Giving Suite at the 66th Primetime Emmy Awards 2Nerium International Joins Television’s Biggest Stars at Backstage Creations Giving Suite at the 66th Primetime Emmy Awards 3
... , , STOCKHOLM , January ... the formation of BioChromix Pharma AB, a,new company working to develop ... Development will initially take,28 percent ownership in the new company. , ... as they have a novel,approach that targets the cause of the ...
... , FORT WORTH, Texas , ... Board: WNDM), announced today that it is nearing the completion of its ... first distributor in that country.  Numerous physicians in the nation have ... with its speed and efficacy in the management of diabetic ulcers ...
... , WILMINGTON, Del. , and ... DD ) and BASF Plant Science announced they have reached an ... DuPont and BASF filed suit against each other in U.S. Federal Court ... property rights relating to biotechnology traits, including traits that provide tolerance to ...
Cached Biology Technology:Karolinska Development Expands its Life Science Portfolio With BioChromix Pharma 2Karolinska Development Expands its Life Science Portfolio With BioChromix Pharma 3Wound Management Technologies, Inc. Rapidly Expands Its International Presence 2Wound Management Technologies, Inc. Rapidly Expands Its International Presence 3Wound Management Technologies, Inc. Rapidly Expands Its International Presence 4DuPont and BASF Announce Settlement 2DuPont and BASF Announce Settlement 3
... to reward the animal for foraging behavior.The Spatial ... built around a video camera, frame grabber, and ... fields at once and up to 6 moving ... records them, but also allows video replay of ...
tracking dye in electrophoresis; free acid, C 19 H 10 BrO 5 S; MW: 669.96...
... The Rice Oligo Microarray, 22K ... of rice genes associated with biological ... abiotic stress response. Each microarray contains ... of the rice (japonica) genome focuses ...
... Last innovation from Magnetofection technology, SilenceMag ... system available. Simple, rapid and easy ... and non toxic. Specifically designed for ... silencing at very low doses of ...
Biology Products: