Navigation Links
Despite their heft, many dinosaurs had surprisingly tiny genomes

They might be giants, but many dinosaurs apparently had genomes no larger than that of a modern hummingbird.

So say scientists who've linked bone cell and genome size among living species and then used that new understanding to gauge the genome sizes of 31 species of extinct dinosaurs and birds, whose bone cells can be measured from the fossil record.

The researchers, at Harvard University and the University of Reading, were led by Chris Organ and Scott V. Edwards, both at Harvard. They report their findings this week in the journal Nature.

"We see distinct differences between two major lineages of dinosaurs," says Organ, a postdoctoral fellow in organismic and evolutionary biology supported by the National Institutes of Health. "The theropods -- carnivores such as Tyrannosaurus rex and Velociraptor -- had very small genomes, in the range of modern birds. Ornithischians -- which include Stegosaurus and Triceratops -- had more moderately sized genomes, akin to those of living lizards and crocodilians. We aren't sure about the genomes of the long-necked sauropods yet."

Organ and Edwards say the clear-cut dichotomy in dinosaur genomes is likely due to different amounts of repetitive and non-coding DNA in the two groups' genetic material, a factor largely responsible for variation in genome size across animal species. They estimate that active repetitive DNA might have comprised an average 12 percent of the ornithischian genome but just 8.4 percent of theropod genetic constitution.

The work indicates that the small genomes typically associated with birds -- whose genetic composition is noticeably sparer than that of other vertebrates -- evolved in dinosaurs some 230 to 250 million years ago, rather than with the emergence of modern living birds just 110 million years ago. Organ and Edwards suggest after this shrinking, theropod genomes then stabilized in size for hundreds of millions of years, a process that continues in mo
'"/>

Source:Harvard University


Page: 1 2

Related biology news :

1. Despite acidity, orange juice could still be a source of foodborne disease
2. Priming embryonic stem cells to fulfill their promise
3. Protein offers way to stop microscopic parasites in their tracks
4. Flocking together: Study shows how animal groups find their way
5. Where bacteria get their genes
6. Chickadees can help humans get their bearings
7. Bacteria use hosts immune response to their competitive advantage
8. Structures of marine toxins provide insight into their effectiveness as cancer drugs
9. Beauty queens urge girls not to sacrifice their bones
10. Researchers learn how blood vessel cells cope with their pressure-packed job
11. Stem cells electric abilities might help their safe clinical use
Post Your Comments:
*Name:
*Comment:
*Email:
TAG: Despite their heft many dinosaurs had surprisingly tiny genomes

(Date:8/10/2015)... LONDON , August 10, 2015 ... visiongain offers comprehensive analysis of the global border ... will generate revenues of $16.4bn in 2015. Now: ... This is an example of the business critical issue you ... to read visiongain ,s objective analysis of how this ...
(Date:8/5/2015)... York , August 5, 2015 ... report titled "Facial Recognition Market - Global Industry Analysis, ... the global market for facial recognition is forecast to ... driven by increased demand for surveillance systems by civil ... rising number of crimes and terrorist activities across the ...
(Date:7/31/2015)... -- Den 10. internationale konference om Genomik (ICG-10, ... 25. oktober i Shenzhen , Kina. ... år. Siden starten i 2006 er ICB blevet en ... er en af de mest dynamiske, entusiastiske og sjove ... gennembrud og fremskridt inden for ,omik,-forskning, som yderligere vil ...
Breaking Biology News(10 mins):Border Security Market Report 2015-2025 - Growth in Biometrics, ICT, Manned and Unmanned Vehicles, and Perimeter Surveillance 2Border Security Market Report 2015-2025 - Growth in Biometrics, ICT, Manned and Unmanned Vehicles, and Perimeter Surveillance 3Border Security Market Report 2015-2025 - Growth in Biometrics, ICT, Manned and Unmanned Vehicles, and Perimeter Surveillance 4Border Security Market Report 2015-2025 - Growth in Biometrics, ICT, Manned and Unmanned Vehicles, and Perimeter Surveillance 5Border Security Market Report 2015-2025 - Growth in Biometrics, ICT, Manned and Unmanned Vehicles, and Perimeter Surveillance 6Border Security Market Report 2015-2025 - Growth in Biometrics, ICT, Manned and Unmanned Vehicles, and Perimeter Surveillance 7Border Security Market Report 2015-2025 - Growth in Biometrics, ICT, Manned and Unmanned Vehicles, and Perimeter Surveillance 8Border Security Market Report 2015-2025 - Growth in Biometrics, ICT, Manned and Unmanned Vehicles, and Perimeter Surveillance 9Facial Recognition Market Expected to Reach US$ 2.67 Bn by 2022, at a CAGR of 9.5% From 2015 - 2022: Transparency Market Research 2Facial Recognition Market Expected to Reach US$ 2.67 Bn by 2022, at a CAGR of 9.5% From 2015 - 2022: Transparency Market Research 3Facial Recognition Market Expected to Reach US$ 2.67 Bn by 2022, at a CAGR of 9.5% From 2015 - 2022: Transparency Market Research 4Facial Recognition Market Expected to Reach US$ 2.67 Bn by 2022, at a CAGR of 9.5% From 2015 - 2022: Transparency Market Research 5Facial Recognition Market Expected to Reach US$ 2.67 Bn by 2022, at a CAGR of 9.5% From 2015 - 2022: Transparency Market Research 6Den 10. internationale konference om Genomics (ICG-10) åbner i oktober 2
... new study of the wandering albatross one of the largest ... are breeding earlier in the season compared with 30 years ago. ... Oikos , a British team of scientists describe how they studied ... of South Georgia. They have discovered that because some birds are ...
... BOSTON -- One of the biggest health problems facing children ... causing obesity and how the U.S. can tackle this problem ... Academic Societies (PAS) annual meeting in Boston. The symposium, ... and How Do We Get Out?" will take place on Monday, ...
... traditional rectangular patchwork of fields in this time series animation ... panhandle near the town of Dalhart, this transformation is due ... to fields. It was invented by farmer Frank Zybach in ... center of the field through a long pipe that rotates ...
Cached Biology News:Antarctic albatross displays shift in breeding habits 2What is really causing the child obesity epidemic? 2NASA's Landsat satellites see Texas crop circles 2
(Date:9/2/2015)... ... September 02, 2015 , ... Drug companies ... compounds. BCC Research reveals in its new report that the U.S. will ... the category and generates the most market demand. , BCC Research examines ...
(Date:9/2/2015)... , Sept. 2, 2015 Veracyte, Inc. (NASDAQ: ... Anderson , president and chief executive officer, will present ... September 16, 2015 at 10:30 a.m. ET in ... The live audio webcast and subsequent replay may be ... will be available shortly after conclusion of the presentation ...
(Date:9/2/2015)... California (PRWEB) , ... September 02, 2015 , ... ... a critical demand to aid high-risk surgeries. From vital sign monitoring in ICU ... by Intel technology enables surgeon to make real-time clinical decisions with simultaneous access ...
(Date:9/2/2015)... ... September 02, 2015 , ... ... life science research, today unveiled Genedata Screener ® version 13.0 at ELRIG ... screening brings to market a rich set of new capabilities. Screener now supports ...
Breaking Biology Technology:Plant-derived Compounds Poised to Assume Greater Role in Global Drug Markets, According to BCC Research 2Plant-derived Compounds Poised to Assume Greater Role in Global Drug Markets, According to BCC Research 3Veracyte to Present at Morgan Stanley Global Healthcare Conference 2Surgical Workstation Powered by 6th Gen. Intel® Core™ Skylake Processors 2Surgical Workstation Powered by 6th Gen. Intel® Core™ Skylake Processors 3New Genedata Screener 13.0 with Support for High Throughput Flow Cytometry and DMPK Unveiled at ELRIG 2New Genedata Screener 13.0 with Support for High Throughput Flow Cytometry and DMPK Unveiled at ELRIG 3New Genedata Screener 13.0 with Support for High Throughput Flow Cytometry and DMPK Unveiled at ELRIG 4
... Dr. Brad Thompson, President,and CEO of Oncolytics Biotech Inc. ... the Company at the Acumen BioFin Rodman & Renshaw ... 3:20 p.m. ET.,The event will be held at the ... live audio webcast of the presentation will be available ...
... Mass., Nov. 1 Verenium Corporation,(Nasdaq: VRNM ... and a,pioneer in the development of high-performance specialty ... Executive Vice President and,Chief Financial Officer, will present ... & Industrial Growth Conference. The,presentation is scheduled to ...
... Perfect Focus System and High-Speed Motorization Meets ... Pharmaceutical Science Research Needs, MELVILLE, N.Y., Nov. ... combined streamlined component automation,with speeds more than twice ... of the Eclipse Ti-E inverted research microscope. The ...
Cached Biology Technology:Media Advisory - Oncolytics Biotech Inc. to Present at Acumen BioFin Rodman & Renshaw 9th Annual Healthcare Conference 2Verenium Corporation to Present at the Pacific Growth Equities 2007 Clean Technology & Industrial Growth Conference 2Verenium Corporation to Present at the Pacific Growth Equities 2007 Clean Technology & Industrial Growth Conference 3Nikon Instruments Launches New Eclipse Ti-E Fully-Integrated, Motorized Inverted Microscope 2Nikon Instruments Launches New Eclipse Ti-E Fully-Integrated, Motorized Inverted Microscope 3
... NaCl, 20mM MOPS, pH 7.5, 60mM ... EGTA, 10 Properites: For selective in ... chromatography, divalent cation activation plus trypsin ... Assurance: routinely evaluated by dephosphorylation of ...
Mouse monoclonal [6G11] to Cytohesin 1 + 2 ( Abpromise for all tested applications)....
HNF-1 Purified Anti-Mouse, Anti-Rat, Anti-Rabbit, Anti-Human clone 2, Isotype Mouse IgG 1 , 50 µg Consult technical datasheet for details....
Recombinant Porcine IL-1 alpha/IL-1F1, CF...
Biology Products: