Navigation Links
Inventions of evolution: What gives frogs a face
Date:1/13/2011

This release is available in German.

"Don't be a frog!" people say in jest when someone hesitates instead of acting straight away. However to be called a frog should actually be a reason to strengthen one's self-confidence. After all frogs are real winners at least from the point of view of evolutionary biology: Nearly 6.000 species are known today. "In terms of numbers frogs are superior to all the other amphibians, and even mammals", says Professor Dr. Lennart Olsson from the Friedrich Schiller University Jena (Germany). Professor Olsson's research group for Systematic Zoology examines these animals's special secret of success. "We are interested in how the frogs developed in such a great variety and which evolutionary new development is responsible for making frogs so particularly successful", Jennifer Schmidt from Olsson's team explains.

Their evolutionary success is literally written all over the frogs' faces: Certain forms of cartilage and bone structures in the region of the head of the tadpoles are among the frogs' "innovations". These structures only to be found in frogs appear in the oral region. They enable the tadpoles of the South African claw frog (Xenopus laevis) particularly well to chip vegetarian food from the soil and from stones or to filter it from the water.

In their latest study which has been published in the science magazine "Journal of Anatomy" together with colleagues from Ulm Jennifer Schmidt analysed the central factor for the development of these morphologically distinctive features of the tadpoles. It is well known from earlier analyses, that the gene "FOXN3" plays a key role in the embryonal development of the heads of claw frogs. "It is responsible for the normal development of cartilages, bones and muscles", Jennifer Schmidt explains.

In the newly published study the 25 year old doctoral candidate and scholar of the Konrad-Adenauer-Stiftung analysed larvae of the claw frog after the "FOXN3"-gene had been cut off. Then she compared them with untreated larvae. "Our analyses with microCT show that the larvae without an intact 'FOXN3'-gene are developing normally up to a certain time." But then the development slows down, says Jennifer Schmidt. "On the whole these animals grow more slowly." Most of all the cartilages, the bones and muscles don't develop properly. Deformations and loss of functions occur. However not all cartilages and muscles are affected by the cut-off gene. "We were able to show that the 'FOXN3' most of all influences the development of the cartilages in the oral region and the gills", Professor Olsson points out. These structures in particular belong to the evolutionary new developments typical of frogs, which are missing in other amphibians. Jennifer Schmidt would like to continue her analyses in her thesis. "We are going to compare the embryonal development of the claw frogs with those of other amphibians", the zoologist says. It would be interesting to find out to what extent the genetic control of those new developments changed in the course of the evolution.


'/>"/>

Contact: Ute Schnfelder
presse@uni-jena.de
49-364-193-1041
Friedrich-Schiller-Universitaet Jena
Source:Eurekalert  

Related biology news :

1. UH: Insular evolution: Large and big-footed voles in an outer archipelago
2. Evolution: Crabs go deep to avoid hot water
3. Forced evolution: Can we mutate viruses to death?
4. Human networking theory gives picture of infectious disease spread
5. UF research gives clues about carbon dioxide patterns at end of Ice Age
6. Chromosomal break gives scientists a break in finding new puberty gene
7. Genome inversion gives plant a new lifestyle
8. Increase in Cambodias vultures gives hope to imperiled scavengers
9. Glorious gadolinium gives flash memory a future
10. Common orchid gives scientists hope in face of climate change
11. Greenland glacier gives birth to giant iceberg
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Inventions of evolution: What gives frogs a face
(Date:1/25/2016)... 2016   Unisys Corporation (NYSE: UIS ) today ... (JFK) International Airport, New York City , to ... attempting to enter the United States using ... pilot testing of the system at Dulles last year. ... JFK during January 2016. --> pilot testing of ...
(Date:1/22/2016)... 2016 http://www.researchandmarkets.com/research/p74whf/global_biometrics ... "Global Biometrics Market in Retail Sector ... --> http://www.researchandmarkets.com/research/p74whf/global_biometrics ) has announced ... Market in Retail Sector 2016-2020" report ... Research and Markets ( http://www.researchandmarkets.com/research/p74whf/global_biometrics ) has ...
(Date:1/20/2016)... 20, 2016   MedNet Solutions , an innovative ... of clinical research, is pleased to announce the attainment ... are the result of the company,s laser focus on ... , it,s comprehensive, easy-to-use and highly affordable cloud-based ... Key MedNet growth achievements in 2015 include: ...
Breaking Biology News(10 mins):
(Date:2/5/2016)... On Thursday, February 11, 2-1-1 San ... health and disaster services, and the Community Information ... care coordination and service delivery for the community to ... to better connect service providers to the information they ... Diego has handled more than 2.5 million ...
(Date:2/5/2016)... -- Australian-US drug discovery and development company, Novogen Limited (ASX:NRT; ... new Chairman, Mr John O,Connor , and new Deputy ... James Garner , has also been formally appointed to ... Mr Iain Ross , will resume his role on ... Garner , has also been formally appointed to the Board ...
(Date:2/4/2016)... February 4, 2016 - New FDA action date of ... New FDA action date of July 22, 2016 ... July 22, 2016   - Lifitegrast ... past decade indicated for the treatment of signs and symptoms of ... has the potential to be the only product approved in the U.S. in the past ...
(Date:2/4/2016)... ... February 04, 2016 , ... Shimadzu Scientific Instruments ... host live demos and poster sessions, and present on the analysis of mycotoxins ... place March 6 to 10 at the Georgia World Congress Center in Atlanta, ...
Breaking Biology Technology: