Birds that make teeth ( Gone does not necessarily mean forgotte...)

Birds that make teeth

Gone does not necessarily mean forgotten, especially in biology. A recent finding by researchers at the University of Wisconsin, Madison, and colleagues from the University of Manchester have found new evidence that the ability to form previously lost organs--in this case, teeth--can be maintained millions of years after the last known ancestor possessed them.

Birds do not have teeth. However, their ancestors did--about 70?0 million years ago. The evolutionary loss of teeth corresponded to the formation of the beak that is present in all living birds. Nonetheless, it has been known that if mouse tooth-forming tissue is in contact with bird jaw tissue, the bird tissue is able to follow the instructions given by the mouse tissue and participate in making teeth, and that these teeth look very much like those of mammals. However, Drs. Matthew Harris and John F. Fallon and colleagues have found that modern birds retain the ability to make teeth even without instruction from their tooth-bearing cousins.

In the new work, the researchers show that the talpid2 strain of chicken harbors a genetic change that permits tooth formation in both the upper and lower jaw of embryonic birds. These teeth show similar developmental position as mammalian teeth and are associated with similar molecular instructions. Furthermore, when comparing the initial development of the structures, the researchers realized that the teeth forming in the chicken did not look like mammalian teeth, but resembled those of the alligator, the closest living relative of modern birds.

The findings strongly suggest that the birds were initiating developmental programs similar to those of their reptilian ancestors. In addition, the authors found that the capacity to form teeth still resides in normal chickens and can be triggered experimentally by molecular signals. Taken together, the new findings indicate that even though modern birds lost teeth millions of years ago, the potential to
'"/>

Source:Cell Press

Page: 1 2
Related biology news :

1. Birds brains reveal source of songs
2. Birds and bats sow tropical seeds
3. Birds going extinct faster due to human activities
4. Birds found to plan for the future
5. Nanospheres that block pain of sensitive teeth
6. Ultrasound may help regrow teeth

Post Your Comments:

(Date:2/8/2010)... Cellular imaging offers a wealth of data about how ... study biological systems is a daunting challenge. In ... ( www.genome.org ), researchers have developed a novel method ... interactions within biological networks, offering a glimpse into the ... scientists have been peering through a microscope at cells ...

(Date:2/8/2010)... third-hand smoke, the residue from tobacco smoke that ... cigarette has been extinguished, reacts with the common ... carcinogens. This new potential health hazard was revealed ... the Lawrence Berkeley National Laboratory (Berkeley Lab). , ... form of a vapor that adsorbs strongly onto ...

(Date:2/8/2010)... to a significantly elevated risk of having a child ... an exhaustive study of all births in California during ... paternal age is associated with elevated autism risk only ... under 30, the study found. , Published online today ... Research, the study, "Independent and Dependent Contributions of ...

Breaking Biology News(10 mins):Method of the future uses single-cell imaging to identify gene interactions 2 Study reveals new details on the dangers of third-hand smoke 2 Study reveals new details on the dangers of third-hand smoke 3 Study reveals new details on the dangers of third-hand smoke 4 UC Davis study confirms link between advanced maternal age and autism 2 UC Davis study confirms link between advanced maternal age and autism 3 UC Davis study confirms link between advanced maternal age and autism 4 Americas Silent Crisis 3A Addiction Downturn Fuels Rising Drug and Alcohol Abuse Phoenix House Study Reveals 49777 1 Americas Silent Crisis 3A Addiction Downturn Fuels Rising Drug and Alcohol Abuse Phoenix House Study Reveals 49777 2 Americas Silent Crisis 3A Addiction Downturn Fuels Rising Drug and Alcohol Abuse Phoenix House Study Reveals 49777 3 Meckels diverticulum masked by intermittent recurrent subocclusive episodes 49773 1 Lack of happiness hormone serotonin in the brain causes impaired maternal behavior in mice 8972 1

[0] Method of the future uses single-cell imaging to identify gene interactions [0] Study reveals new details on the dangers of third-hand smoke [0] UC Davis study confirms link between advanced maternal age and autism

... in the ESA journals Frontiers in Ecology and the ... Ecological Monographs . , 1. Fuel removal ... , Ecological Applications , ... methods under the U.S. National Fire and Fire Surrogate Study. ...

... growing food in northern Ghana difficult enough. It doesn,t help ... available to power tractors for planting crops or to power ... the seeds from some native trees may be able to ... Ghana to create biodiesel from the seeds of trees that ...

... Exxon Valdez oil spill devastated a vast stretch of the ... unable to effectively manage a large oil spill, according to ... anniversary of the Exxon Valdez spill approaches on March 24, ... oil development in the Arctic until technologies improve to ensure ...

Other Biology News:Highlights from the March editions of ESA journals 2 Highlights from the March editions of ESA journals 3 K-State researchers work with university in Ghana to create biofuels from native tree seeds 2 Arctic governments and industry still unprepared for oil spills 20 years after Exxon Valdez 2 Arctic governments and industry still unprepared for oil spills 20 years after Exxon Valdez 3

Highlights from the March editions of ESA journals K-State researchers work with university in Ghana to create biofuels from native tree seeds Arctic governments and industry still unprepared for oil spills 20 years after Exxon Valdez

(Date:2/8/2010)... Feb. 8 /PRNewswire-FirstCall/ - YM BioSciences ... operational and financial results for the second quarter ... . ,, "After rigorous evaluation of numerous global ... a clinical-stage, Melbourne -based drug development company, ... David Allan , Chairman & CEO of YM ...

(Date:2/8/2010)... Feb. 8 Corgenix Medical Corporation (OTC ... diagnostic test kits, and Tulane University , today ... combat viral hemorrhagic fever (VHF), an effort that will ... for Corgenix over the life of the contract. ... a five-year contract totaling $15,224,927 to ...

(Date:2/8/2010)... Neurocrine Biosciences, Inc. (Nasdaq: NBIX ) ... Ph.D. to its Board of Directors effective immediately. He ... Receptos, Inc., and former Executive Chairman of Biogen Idec, ... Bill Rastetter to our Board of Directors," said ... Board of Neurocrine Biosciences. "The company is very fortunate ...

(Date:2/5/2010)... test to find undetected landmines. , Students from the ... glows green when it comes into contact with chemicals ... mixed into a colourless solution that, when sprayed on ... presence of landmines. , Researchers say that the ... from the air onto areas thought to contain landmines, ...

[0] YM BioSciences reports second quarter 2010 operational and financial results [0] Corgenix and Tulane Announce Award of Additional NIH Contract to Expand Lassa Fever Research Towards Development of Vaccines and Improved Therapeutic Agents [0] Neurocrine Biosciences Announces the Appointment of William H. Rastetter to Its Board of Directors [0] Simple test could offer cheap solution to detecting landmines

... Care managers can now quickly and easily access ... environment of care (EC) compliance with the ... interviews with EC experts called "EC Bits."EC Bits audio ... feature expert advice to help keep EC managers ...

... CITY, Calif., Feb. 24 Pearl Therapeutics announced,today that ... Oxford,Finance Corporation and Silicon Valley Bank, a member ... provided the capital which will be drawn in two,tranches. ... to be working with Oxford and SVB. They ...

... Feb. 24 Novasys Medical, Inc., a ... today that Noridian,Administrative Services, LLC, a regional ... now covering the non-surgical Renessa treatment,for women ... currently,administers benefits for approximately 4 million Medicare ...

Other Biology Technology:Web-based Audio Interviews Keep Environment of Care Managers Up-to-Date on Key EC Compliance Issues 2 Pearl Therapeutics Secures $8 Million in Debt Financing 2 Pearl Therapeutics Secures $8 Million in Debt Financing 3 Noridian Medicare Now Covers Renessa(R) Treatment for Incontinence in Women 2

Web-based Audio Interviews Keep Environment of Care Managers Up-to-Date on Key EC Compliance Issues Pearl Therapeutics Secures $8 Million in Debt Financing Noridian Medicare Now Covers Renessa(R) Treatment for Incontinence in Women

... II xi 2-D system runs both gel dimensions in ... gels can be separated in a single run using ... core in much the same manner as the slab ... second-dimension slab gels may be cast in the casting ...

... Experion StdSens analysis kit for 25 chips ... perform standard-sensitivity RNA analysis (at nanogram levels) ... kit includes 25 RNA StdSens microfluidic chips, ... x 20 microliters RNA StdSens stain, 2 ...

... Rotator, variable speed, timer, SB3, Fully adjustable ... of tube holders to hold a number ... SB3 is ideal for aerating cultures, keeping ... mixing applications., The rotator can be used ...

...

Biology Products:

PROTEAN II xi 2-D Cell from Bio-Rad Experion RNA StdSens Analysis Kit for 25 Chips from Bio-Rad Tube Rotator from Barloworld Scientific Ltd BD FACSArray bioanalyzer from BD Biosciences - Immunocytometry Systems

( Gone does not necessarily mean forgotte...)Birds that make teeth