Navigation Links
Primordial fish had rudimentary fingers
Date:9/22/2008

Tetrapods, the first four-legged land animals, are regarded as the first organisms that had fingers and toes. Now researchers at Uppsala University can show that this is wrong. Using medical x-rays, they found rudiments of fingers in the fins in fossil Panderichthys, the transitional animal, which indicates that rudimentary fingers developed considerably earlier than was previously thought.

Our fish ancestors evolved into the first four-legged animals, tetrapods, 380 million years ago. They are the forerunners of all birds, mammals, crustaceans, and batrachians. Since limbs and their fingers are so important to evolution, researchers have long wondered whether they appeared for the first time in tetrapods, or whether they had evolved from elements that already existed in their fish ancestors.

When they examined genes that are necessary for the evolution of fins in zebrafish (a ray-finned fish that is a distant relative of coelacanth fishes) and compared them with the gene that regulates the development of limbs in mice, researchers found that zebrafish lacked the genetic mechanisms that are necessary for the development of fingers. It was therefore concluded that fingers appeared for the first time in tetrapods. This reading was supported by the circumstance that the fossil Panderichthys, a transitional animal between fish and tetrapod, appeared to lack finger rudiments in their fins.

In the present study, to be published in Nature, medical x-rays (CT scans) were used to reconstruct a three-dimensional image of Panderichthys fins. The results show hitherto undiscovered elements that constitute rudiments of fingers in the fins. Similar rudiments have been demonstrated once in the past, two years ago in Tiktaaliks, which is a more tetrapod-like group. Together with information about fin development in sharks, paddlefish, and Australian lungfish, the scientists can now definitively conclude that fingers were not something
'/>"/>

Contact: Catherine Boisvert
catherine.boisvert@ebc.uu.se
61-437-535-211
Uppsala University
Source:Eurekalert

Page: 1 2

Related biology news :

1. Scientists rebuild ancient proteins to reveal primordial Earths temperature
2. Meteorites a rich source for primordial soup
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:4/17/2014)... COLUMBIA, Mo. April 17 In the most densely ... States, forests reflect two centuries of human needs, values ... logging and clearing forests for agriculture and development, have ... today, a U.S. Forest Service study reports. , The ... forest conditions and management needs in the Northern United ...
(Date:4/17/2014)... there was a word for chili peppers. Information about ... with a study of the appearance of words for ... where jalapeos were domesticated and highlight the value of ... Kraft et al.) of nine papers presented in a ... National Academy of Sciences on plant and animal ...
(Date:4/17/2014)... new modeling study suggests that fish consumption advisories ... exposure to long-lived contaminants like persistent organic pollutants ... team of researchers including University of Toronto Scarborough ... looks at how different levels of environmental contamination, ... of chemicals in the body influenced exposure in ...
Breaking Biology News(10 mins):Five anthropogenic factors that will radically alter northern forests in 50 years 2Five anthropogenic factors that will radically alter northern forests in 50 years 3Chickens to chili peppers 2Chickens to chili peppers 3Fish consumption advisories fail to cover all types of contaminants 2
... piece to the mounting body of evidence that suggests ... "passive ventilation" significantly increases survival rates, compared to the ... an online edition of Annals of Emergency Medicine, compared ... arrest outside a hospital setting and were resuscitated in ...
... University of Jerusalem have succeeded for the first time ... basic cellular mechanism that enables networks of neurons to ... research may lead to the upgrading of computer algorithms ... as to the development of innovative treatments for auditory ...
... August 11, 2009 Researchers at the Department of ... the effects of formal education on the symptoms of ... diminishes the impact of Alzheimer,s disease on cognition even ... The results are published in the current issue of ...
Cached Biology News:Cardiac arrest resuscitation: Passive oxygen flow better than assisted ventilation 2Hebrew U. researchers shed light on the brain mechanism responsible for processing of speech 2Formal education lessens the impact of Alzheimer's disease 2
(Date:1/14/2014)... Jan. 14, 2014  3D Communications, a leading provider of strategic communications ... and media events in the United States ... Virginia Cox , JD, is returning to the firm,s ... re-joins 3D after more than two years of service as ...
(Date:1/14/2014)... The largest international professional organization of scientists ... derivatives thereof has endorsed an educational program that ... challenges of adulterated herb and botanical products. ... The Society for Medicinal Plant and Natural Product ...
(Date:1/14/2014)... 2014 In recent years, growing suspicion ... in product development and promotion has led to unprecedented ... fueled by concerns about the insidious impact of commercialization ... spectacular fines to the world’s biggest pharmas for illegal ...
(Date:1/14/2014)... , Jan. 14, 2014   Kinaxis ®, provider of ... ) and sales and operations planning ( S&OP ) service, ... Biomanufacturing Summit , which will be held at the Hilton ... conference, join Kinaxis customer Elisabeth Kaszas , Director of ...
Breaking Biology Technology:Former FDA Associate Commissioner Returns To 3D Communications 2World's Largest Group of Medicinal Plant Researchers Endorses ABC-AHP-NCNPR Botanical Adulterants Program 2World's Largest Group of Medicinal Plant Researchers Endorses ABC-AHP-NCNPR Botanical Adulterants Program 3World's Largest Group of Medicinal Plant Researchers Endorses ABC-AHP-NCNPR Botanical Adulterants Program 4World's Largest Group of Medicinal Plant Researchers Endorses ABC-AHP-NCNPR Botanical Adulterants Program 5World's Largest Group of Medicinal Plant Researchers Endorses ABC-AHP-NCNPR Botanical Adulterants Program 6World's Largest Group of Medicinal Plant Researchers Endorses ABC-AHP-NCNPR Botanical Adulterants Program 7World's Largest Group of Medicinal Plant Researchers Endorses ABC-AHP-NCNPR Botanical Adulterants Program 8The Sunshine Act: Necessary Regulation or Unnecessary Dysregulation? New Life Science Webinar Hosted by Xtalks and IRB Services 2The Sunshine Act: Necessary Regulation or Unnecessary Dysregulation? New Life Science Webinar Hosted by Xtalks and IRB Services 3Event Alert: Kinaxis Customer to Present at the Biomanufacturing Summit "Supply Chain: Improving Network Effectiveness" 2
... compound found in plants and food groups, notably red ... mitochondria, the cell,s energy supplier. "The results were ... at Harvard Medical School and the study,s senior author. ... The findings are to be published May ...
...  The Diagnostic Marketing Association ( DxMA ), serving marketing, ... device market segments, today presented its 2011 Marketer of ... ), a leading molecular diagnostics company. Presented at the ... recognizes innovation by marketers seeking to highlight their company ...
... SAN DIEGO, May 1, 2012 AnaptysBio, Inc., ... antibody discovery partnership with Gilead Sciences, Inc. to ... http://photos.prnewswire.com/prnh/20111205/SF16052LOGO ) Under this ... SHM-XEL platform will be transferred to Gilead for ...
Cached Biology Technology:More evidence for longevity pathway 2Diagnostic Marketing Association Names Cepheid 2011 Marketer of the Year 2AnaptysBio Announces Antibody Discovery Partnership With Gilead Sciences 2
... Oncostatin M (OSM) is a pleiotropic cytokine ... Kaposis sarcoma cells. OSM inhibits the growth ... simulates fibroblast, smooth muscle and Kaposis sarcoma ... and low density lipoprotein receptor expression on ...
Mouse polyclonal antibody to BTAF1 - BTAF1 RNA polymerase II, B-TFIID transcription factor-associated, 170kDa (Mot1 homolog, S. cerevisiae)...
... 15(R)-17-phenyl trinor Prostaglandin F2α isopropyl ... is the latanoprost-related isomer containing both ... an inverted (β) hydroxyl group at ... PGF2α isopropyl ester is a potential ...
Mouse monoclonal antibody to RAD51L3 - RAD51-like 3 (S. cerevisiae)...
Biology Products: