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:11/7/2014)... Auguste, associate professor, biomedical engineering, in the Grove ... New York, have identified a molecule that could ... most aggressive forms of breast cancer. , Triple ... rate owing to aggressive proliferation and metastasis and ... Auguste,s team, discovered the overexpression of intercellular adhesion ...
(Date:11/6/2014)... TALLAHASSEE, Fla. -- A groundbreaking paper from a team ... better understanding of how plants could adapt to and ... The research, published in the latest issue of the ... how chromatin (the complex of DNA and proteins) is ... material, so that some genes are turned on and ...
(Date:11/6/2014)... 2014 - Insilico Medicine, Inc, a Baltimore-based bioinformatics ... related diseases announced a research collaboration with the ... Oncology, Inc (OTC: CSBR). , "There are many ... but Champions Oncology,s TumorGraft technology is unique in ... regimen experimentally generating vast amounts of valuable data. ...
Breaking Biology News(10 mins):Maize analysis yields whole new world of genetic science 2Insilico Medicine, Inc announces research collaboration with Champions Oncology, Inc 2
... a drink problem, there is a greater risk that you ... from the Sahlgrenska Academy, at the University of Gothenburg, Sweden. ... 50% more likely to have a drink problem in the ... new light on this link. Carried out by researcher Anna ...
... LAWRENCE University of Kansas scientists have found new evidence ... (LCPUFA) are good for developing brains and hearts. In ... of four formulas from birth to 12 months; three with ... formula with no LCPUFA, and tested at four, six and ...
... our understanding of genetics and biological processes in all animals, ... of animals, scientists are still finding the fruit fly to ... the University of Rochester. The latest revelation has to ... fruit flies. It was widely accepted that all X chromosomes ...
Cached Biology News:New thinking on regulation of sex chromosomes in fruit flies 2
(Date:11/24/2014)... DUBAI , UAE, November 24, 2014 ... prestigious "Sheikh Hamdan Bin Rashid Al Maktoum Awards for ... in Dubai, United Arab Emirates , ... http://photos.prnewswire.com/prnh/20141124/717861 ) , The Carter Center ... Medical Services is actively involved in numerous programs that ...
(Date:11/24/2014)... Belgium , Nov. 24, 2014 VolitionRx ... developing diagnostic tests for cancer and other conditions, today announced ... presented at the Science for Business BioWin Day 2014, being ... . The data come from VolitionRx,s lung cancer pilot study, ... of the Centre Hospitalier Universitaire (CHU) de Liege in ...
(Date:11/24/2014)... FRANCISCO, Calif. , Nov. 24, 2014   Veracyte, ... Bonnie H. Anderson , president and chief executive officer, ... Jaffray 26 th Annual Healthcare Conference on Tuesday, December ... York . The live audio webcast and ... http://investor.veracyte.com . Please connect to the website at least ...
(Date:11/24/2014)... MD (PRWEB) November 24, 2014 ... underrepresented patient populations into clinical trials at its ... , “Continental was created with the idea ... play a fundamental role in medical advances," said ... Tuskegee syphilis experiment to the immortal cell line ...
Breaking Biology Technology:Five US Winners Among Recipients of Hamdan Medical Awards 2VolitionRx to Present Positive Data from Pilot Lung Cancer Study at BioWin Day 2014 2VolitionRx to Present Positive Data from Pilot Lung Cancer Study at BioWin Day 2014 3VolitionRx to Present Positive Data from Pilot Lung Cancer Study at BioWin Day 2014 4VolitionRx to Present Positive Data from Pilot Lung Cancer Study at BioWin Day 2014 5VolitionRx to Present Positive Data from Pilot Lung Cancer Study at BioWin Day 2014 6Veracyte to Present at the Piper Jaffray 26th Annual Healthcare Conference 2At Continental Clinical Solutions, CEO Saleh Stevens Focuses on Diversity in Clinical Trial Recruitment at Maryland Site 2At Continental Clinical Solutions, CEO Saleh Stevens Focuses on Diversity in Clinical Trial Recruitment at Maryland Site 3
... Universal Detection,Technology (OTC Bulletin Board: UNDT), a ... bioterrorism and other,infectious health threats and provider of ... company,s CEO, Jacques Tizabi,is featured in an exclusive ... interview gives viewers an overview of the company, ...
... Aug. 14 /Xinhua-PRNewswire-FirstCall/ --,China Biologic Products, Inc. (OTC ... the leading plasma-based pharmaceutical companies in,the People,s Republic ... second quarter ended June 30, 2008., ... 35.1% year-over-year to $11.9 million -- Gross ...
... Mass., Aug. 14 Pressure,BioSciences, Inc. (Nasdaq: PBIO ... for the second quarter of 2008 was $120,184 compared ... Revenue from the sale,of PCT products and services was ... compared to $136,355 for the prior year period. During ...
Cached Biology Technology:[video] Jacques Tizabi, CEO of Universal Detection Technology Discusses Latest Purchase Order on WallSt.net's 3-Minute Press Show 2China Biologic Products Reports Second Quarter 2008 Results 2China Biologic Products Reports Second Quarter 2008 Results 3China Biologic Products Reports Second Quarter 2008 Results 4China Biologic Products Reports Second Quarter 2008 Results 5China Biologic Products Reports Second Quarter 2008 Results 6China Biologic Products Reports Second Quarter 2008 Results 7China Biologic Products Reports Second Quarter 2008 Results 8China Biologic Products Reports Second Quarter 2008 Results 9China Biologic Products Reports Second Quarter 2008 Results 10China Biologic Products Reports Second Quarter 2008 Results 11China Biologic Products Reports Second Quarter 2008 Results 12China Biologic Products Reports Second Quarter 2008 Results 13China Biologic Products Reports Second Quarter 2008 Results 14China Biologic Products Reports Second Quarter 2008 Results 15Pressure BioSciences, Inc. Reports Second Quarter 2008 Financial Results and Provides Business Update 2Pressure BioSciences, Inc. Reports Second Quarter 2008 Financial Results and Provides Business Update 3Pressure BioSciences, Inc. Reports Second Quarter 2008 Financial Results and Provides Business Update 4Pressure BioSciences, Inc. Reports Second Quarter 2008 Financial Results and Provides Business Update 5Pressure BioSciences, Inc. Reports Second Quarter 2008 Financial Results and Provides Business Update 6Pressure BioSciences, Inc. Reports Second Quarter 2008 Financial Results and Provides Business Update 7Pressure BioSciences, Inc. Reports Second Quarter 2008 Financial Results and Provides Business Update 8Pressure BioSciences, Inc. Reports Second Quarter 2008 Financial Results and Provides Business Update 9
... number is a new product number, ... number. If showing no availability yet, ... number (E6152) or contact customer service ... diam. 11.25 6.40 in. ...
A convenience pack containing one each of the most popular sizes of Cat. No. 4980 flask. Designed for the low volume user, a case contains one each of five sizes: 50mL, 125mL, 250mL, 500mL, and 1L....
...
...
Biology Products: