Navigation Links
Yale researchers solve mystery of disappearing bird digit
Date:9/4/2011

Evolution adds and subtracts, and nowhere is this math more evident than in vertebrates, which are programmed to have five digits on each limb. But many species do not. Snakes, of course, have no digits, and birds have three.

Yale scientists now have a good handle on how these developmental changes are orchestrated in the embryo, but there is still one outstanding debate on birds: Which digits are they: a thumb with index and middle fingers, or the index, middle and ring fingers?

In five-digit vertebrates, the thumb comes from the precursor stem cells labeled pa. While birds have a digit that looks like a thumb, pa precursor cells die off during development and never produce a digit in adults. As a result, scientists have wondered whether precursor cells in pb can make a thumb.

Yale scientists have completed a genomic analysis of birds that reveals the answer (shown in orange on illustration). It is a hands down "yes" even though the first bird digit develops where the index finger on a five-finger vertebrae should be.


'/>"/>

Contact: Bill Hathaway
203-432-1322
Yale University
Source:Eurekalert  

Page: 1

Related biology news :

1. Researchers explain how railways within cells are built in order to transport essential cargos
2. Louisiana Tech University researchers, NASA partner to conduct zero-gravity experiments
3. Breast cancer risk drops when diet includes walnuts, Marshall researchers find
4. Persistent immunity: Wistar researchers find signals that preserve anti-viral antibodies
5. Exercise boosts health by influencing stem cells to become bone, not fat, McMaster researchers find
6. Researchers report new understanding of role of telomeres in tumor growth
7. Lawson researchers share in $2.2 million grant
8. NIH-funded researchers discover genetic link to mesothelioma
9. UC Davis researchers find disease-causing fat cells in those with metabolic syndrome
10. Researchers uncover source of Haitian cholera outbreak
11. VBI, Convey Computer partner to deliver technology to biomedical, life sciences researchers
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Yale researchers solve mystery of disappearing bird digit
(Date:1/25/2017)... The Elements of Enterprise Information Security ... of a comprehensive set of business processes and ... identities and providing a secured and documented access ... number of programs opted by enterprises to maintain ... processes and changing policies. However, there are some ...
(Date:1/24/2017)... -- It sounds simple and harmless—an electronic sensor attached ... and alerts parents on their smart phones if, ... But pediatric experts argue that such devices may ... of medical benefits, especially to healthy babies. ... of healthy babies, promising peace of mind about ...
(Date:1/21/2017)... Research and Markets has announced the addition of the ... ... voice recognition biometrics market to grow at a CAGR of 19.36% ... present scenario and the growth prospects of the global voice recognition ... considers the revenue generated from the sales of voice recognition biometrics ...
Breaking Biology News(10 mins):
(Date:2/22/2017)... ... February 22, 2017 , ... Park Systems , a leader ... for all SPIE attendees and Park customers on Feb. 27, 2017 ... the San Jose Convention Center. The luncheon will feature a talk on Automated ...
(Date:2/22/2017)... , ... February 22, 2017 , ... ... tech innovators, engineers, and scientists from around the world, is pleased to announce ... February 22 and 23, 2017. This premier, online-only conference focused on the development ...
(Date:2/22/2017)... (PRWEB) , ... February 22, 2017 , ... ... that Dr. Daniel Spyker, PhD, MD former Acting Deputy Director in the FDA ... Pilot Drug Evaluation Staff has joined the company as an Expert Consultant. , ...
(Date:2/21/2017)... 21, 2017 /PRNewswire/ - SQI Diagnostics Inc. ("SQI" or the "Company") ... for the three months ended December 31, 2016. ... sciences and diagnostics company that develops and commercializes proprietary technologies ... ... on the commercial milestones achieved in fiscal 2016," said ...
Breaking Biology Technology: