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:10/4/2017)... BLOOMINGTON, Ill. , Oct. 4, 2017  GCE Solutions, a ... powerful new data and document anonymization solution on October 4, 2017. ... the pharmaceutical field to comply with policy 0070 of the European ... documents and data. ... Innovation by GCE Solutions ...
(Date:6/23/2017)... ITHACA, N.Y. , June 23, 2017 /PRNewswire/ ... leader in dairy research, today announced a new collaboration ... reduce the chances that the global milk supply is ... dairy project, Cornell University has become the newest academic ... Supply Chain, a food safety initiative that includes IBM ...
(Date:5/6/2017)... RAM Group , Singaporean based ... in biometric authentication based on a novel  ... to perform biometric authentication. These new sensors are based on ... Ram Group and its partners. This sensor will have ... and security. Ram Group is a next generation ...
Breaking Biology News(10 mins):
(Date:10/9/2017)... ... ... At its national board meeting in North Carolina, ARCS® Foundation ... Physics and Astronomy, has been selected for membership in ARCS Alumni Hall of ... Breakthrough Prize in Fundamental physics for the discovery of the accelerating expansion of the ...
(Date:10/7/2017)... ... October 06, 2017 , ... ... for microscopy and surface analysis, Nanoscience Instruments is now expanding into Analytical ... broad range of contract analysis services for advanced applications. Services will leverage ...
(Date:10/6/2017)... ... 2017 , ... The HealthTech Venture Network (HTVN) is proud ... annual Conference where founders, investors, innovative practitioners and collaborators are invited to a ... early stage digital health and med tech companies. , This day-long event will ...
(Date:10/5/2017)... ... October 05, 2017 , ... Understanding the microbiome, the millions of bacteria that ... Love: You Are My Future, the newest exhibit on display at the University City ... human condition through the lens of the gut microbiome. , Gut Love opens ...
Breaking Biology Technology: