Navigation Links
After dinosaurs, mammals rise but their genomes get smaller
Date:7/27/2009

BLOOMINGTON, Ind. -- Evidence buried in the chromosomes of animals and plants strongly suggests only one group -- mammals -- have seen their genomes shrink after the dinosaurs' extinction. What's more, that trend continues today, say Indiana University Bloomington scientists in the first issue of a new journal, Genome Biology and Evolution.

The scientists' finding might seem counter-intuitive, given that the last 65 million years have seen mammals expand in diversity and number, not to mention dominance in a wide variety of ecological roles. But it is precisely their success in numbers that could have led to the contraction of their genomes.

"Larger population sizes make natural selection more efficient," said IU Bloomington evolutionary biologist Michael Lynch, who led the study. "If we are correct, we have shown how to bring ancient genomic information together with the paleontological record to learn more about the past."

And the present. Lynch says the data he and his colleagues analyzed suggest human genomes are still undergoing a contraction -- though you shouldn't expect to see noticeable changes in our chromosomes for a few million years yet.

Lynch's group examined the genomes of seven mammals, eight non-mammalian animals and three plants, specifically with regard for the long terminal repeat (LTR) sequences of transposable elements, a curious sort of "jumping" genetic sequence initially dropped into genomes by viruses. IU School of Informatics (Bloomington) bioinformaticians Mina Rho and Haixu Tang oversaw the survey of mammalian and non-mammalian genomes.

Transposable elements often lose their functionality soon after insertion but nevertheless are disturbingly common. In the human genome, for example, transposable elements constitute as much as 45 percent of an individual's total DNA. Long terminal repeat sequences, part of that figure, make up about 8 percent of humans' total DNA.

LTR
'/>"/>

Contact: David Bricker
brickerd@indiana.edu
812-856-9035
Indiana University
Source:Eurekalert

Page: 1 2

Related biology news :

1. Silicon with afterburners: Process developed at Rice could be boon to electronics manufacturer
2. Single thawed embryo transfer after PGD does not affect pregnancy rates
3. Ovarian transplantation: First baby is born after a new technique
4. New species of phallus-shaped mushroom named after California Academy of Sciences scientist
5. Pediatric carbon monoxide poisoning linked to video games after Hurricane Ike
6. New book suggests Earth perhaps not such a benevolent mother after all
7. Older men more likely than women to die after pneumonia
8. UC Riverside researcher names lichen after President Barack Obama
9. Research synthesis shines light on several management options after fires in diverse ecosystems
10. Arctic governments and industry still unprepared for oil spills 20 years after Exxon Valdez
11. After a few drinks, older adults more impaired than they think
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:1/22/2015)... Jan. 21, 2015  Analyst Report Issued by Small Cap IR. ... showed that planet-wide, transactions at merchants on the leading payment ... number of credit, debit, and prepaid cards reached 6.54 billion.  ... of fraudulent card usage in 2012, and credit and debit ...
(Date:1/22/2015)... 22, 2015 Infinisource has launched its new NXG series ... The G2 sets a higher standard for collecting attendance and ... solution. With plug-and-play installation, touch screen interface and seamless connection ... robust time collection solution for the small to mid-size employer. ...
(Date:12/22/2014)... DENVER , Dec. 22, 2014  The 2014 Holiday ... industry as Acuity Market Intelligence reports that the long ... Acuity forecasts that intensifying demand for smart phones, tablets, ... a global market of 2.5 billion users with nearly ...
Breaking Biology News(10 mins):$4.80 Near Term Price Target with "Buy" given by CapRock Research for NXT-ID, Inc. (NASDAQ: NXTD) issued by Small Cap IR 2Infinisource's NXG series sets new time clock standard 2First Season of Holiday Shopping with Mobile Biometric Payments Wraps Up With a Present for Biometrics Industry: A Rosy Forecast for More Than 2 Billion Users of 4.8 Billion Mobile Biometric Devices by 2020 2
... at the Swedish medical university Karolinska Institutet have discovered ... and liver dysfunction. The disease, adenosine kinase deficiency, is ... for the enzyme adenosine kinase. The findings, ... Human Genetics, were made possible through the detailed ...
... RIDGE, Tenn., Sept. 30, 2011 -- Molecular motion ... to a collaboration by researchers at the Department ... University of Tennessee, in research reported in Physical ... by ORNL-UT Governor,s Chairs Jeremy Smith and Alexei ...
... Research published in the October issue of The American ... dry season with the help of the same phenomenon that ... from Charles Darwin University in Australia, tree frogs often plop ... in tropical Australia. When they return to their dens, condensation ...
Cached Biology News:New inherited neurometabolic disorder discovered 2High-performance simulation, neutrons uncover 3 classes of protein motion 2Tree frogs chill out to collect precious water 2
(Date:1/22/2015)... Controlled Substance Compliance Services (CSCS), a project managed ... legal requirements around using controlled substances in pharmaceutical research, ... their international operations expand and become increasingly complex, large ... a result of the first phase of the CSCS ...
(Date:1/22/2015)... , Nueva Jersey , 22 de enero ... for Biomedical Research abre hoy su llamada a nominaciones ... cuya investigación científica ha hecho, o tiene el potencial ... salud humana. Las nominaciones se aceptarán hasta el 15 ...
(Date:1/22/2015)... Jan. 22, 2015   GenoSpace , a precision medicine software ... enable the broad use of genomic, imaging and other biomedical ... of Michelle Munson , CEO of Aspera, an IBM ... Logo - http://photos.prnewswire.com/prnh/20150122/170713 "We are ...
(Date:12/24/2014)... SPRING, Md. , Dec. 24, 2014  United Therapeutics ... Medtronic, Inc. (NYSE: MDT ) has submitted ... Drug Administration (FDA) for the use of Medtronic,s SynchroMed ... newly developed catheter) for use with United Therapeutics, Remodulin ...
Breaking Biology Technology:Global Compliance Service for Controlled Substances to Expand to China 2El Dr. Paul Janssen Award for Biomedical Research emite su llamada a los nominados para 2015 2El Dr. Paul Janssen Award for Biomedical Research emite su llamada a los nominados para 2015 3El Dr. Paul Janssen Award for Biomedical Research emite su llamada a los nominados para 2015 4GenoSpace Expands Board with Appointment of Michelle Munson 2United Therapeutics Announces Submission Of Pre-Market Approval Application For Implantable Drug Infusion System To Deliver Remodulin 2United Therapeutics Announces Submission Of Pre-Market Approval Application For Implantable Drug Infusion System To Deliver Remodulin 3United Therapeutics Announces Submission Of Pre-Market Approval Application For Implantable Drug Infusion System To Deliver Remodulin 4
... Wisconsins economy needs new thoughts, new processes, and new innovations, ... New Economy is an old worn-out phase used in Silicon ... lies, lavish spending and corruption as well as cute, but ... Wisconsin Economy will unfold in a Real-Time Economy, in which ...
... requires more than a marketing campaign and the involvement ... (HR managers, senior executives and middle managers responsible for ... experience) play a vital role in marketing the brand. ... to work. , ,Be Your Message. Employer brand ...
... risk capital financier with a portfolio perspective knows that ... to generate high returns to make up for the ... annualized return requirement, the winners will have to return ... returns $500,000+). Using some basic assumptions (7.5% ROS, 10x ...
Cached Biology Technology:Wisconsins Real-Time" Economy 2Wisconsins Real-Time" Economy 3Wisconsins Real-Time" Economy 4Employer Brands Require More Than Slick Marketing 2Growth: the Good, the Bad, and the Ugly 2Growth: the Good, the Bad, and the Ugly 3Growth: the Good, the Bad, and the Ugly 4