Featured Research

from universities, journals, and other organizations

Evolution keeps sex determination flexible

Date:
September 12, 2011
Source:
Michigan State University
Summary:
There are many old wives' tales about what determines a baby's sex, yet it is the tight controls at the gene level that determine an organism's sex in most species. Researchers have found that even when genetic and genomic mechanisms are disrupted, organisms quickly evolve ways to compensate.

Worms help MSU researchers shed light on sex determination.
Credit: MSU

There are many old wives' tales about what determines a baby's sex, yet it is the tight controls at the gene level that determine an organism's sex in most species. Researchers at Michigan State University have found that even when genetic and genomic mechanisms are disrupted, organisms quickly evolve ways to compensate.

In research published this week in Evolution, scientists from MSU's BEACON Center for the Study of Evolution in Action led a team of researchers using an experimental evolution approach to study adaptations in sexual determination of nematodes, more commonly known as worms.

"Our findings show the nematodes evolved quickly to diminish any negative effects caused by mutations in the sex-determining mechanisms," said Christopher Chandler, a post-doctoral researcher who led the study.

Chandler studied 50 generations of nematodes after introducing mutations in the genes that normally help worms develop into males or females. These mutations' effects also depend on the environmental temperatures, so the team tested whether worms adapted to the mutations at just one temperature or across a range of temperatures.

"Unless we grew them in pretty warm environments, it didn't seem to matter much -- the worms evolved to do better across a range of temperatures," Chandler said.

At the genetic level, worms bypassed the problem rather than fixing it, said Ian Dworkin, assistant professor of zoology.

"There was little or no change in the genes involved, and instead they made the changes elsewhere," he said. "As they evolved, they swiftly compensated to create a balance with respect to their sex."

The findings have big implications for how sex determination evolves. Sex determination is important for reproduction in all organisms and it is tightly controlled at the gene level.

"Our findings show the mechanisms themselves are flexible and adaptable from an evolutionary viewpoint," Chandler said. "If something goes wrong with the control mechanisms, a work-around can quickly be found to restore the balance."

The National Science Foundation funded the study. Dworkin and Chandler are members of BEACON, an NSF-funded Science and Technology Center. The research team also included researchers from Iowa State University and the University of Oregon.


Story Source:

The above story is based on materials provided by Michigan State University. Note: Materials may be edited for content and length.


Journal Reference:

  1. Christopher H. Chandler, Genna E. Chadderdon, Patrick C. Phillips, Ian Dworkin, Fredric J. Janzen. Experimental Evolution of the Caenorhabditis Elegans Sex Determination Pathway. Evolution, 2011; DOI: 10.1111/j.1558-5646.2011.01420.x

Cite This Page:

Michigan State University. "Evolution keeps sex determination flexible." ScienceDaily. ScienceDaily, 12 September 2011. <www.sciencedaily.com/releases/2011/09/110912143447.htm>.
Michigan State University. (2011, September 12). Evolution keeps sex determination flexible. ScienceDaily. Retrieved October 22, 2014 from www.sciencedaily.com/releases/2011/09/110912143447.htm
Michigan State University. "Evolution keeps sex determination flexible." ScienceDaily. www.sciencedaily.com/releases/2011/09/110912143447.htm (accessed October 22, 2014).

Share This



More Fossils & Ruins News

Wednesday, October 22, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Turns Out Jack The Ripper's True Identity Is Still Unknown

Turns Out Jack The Ripper's True Identity Is Still Unknown

Newsy (Oct. 20, 2014) After testing DNA from a shawl found near one of Jack the Ripper's victims, a scientist said he'd identified the killer. New reports refute the claim. Video provided by Newsy
Powered by NewsLook.com
Fish Fossil Shows First-Ever Sex Was Done Side By Side

Fish Fossil Shows First-Ever Sex Was Done Side By Side

Newsy (Oct. 19, 2014) A 380-million-year-old fish may be the first creature to have copulative sex - and it was side by side with arms linked, like square dancers. Video provided by Newsy
Powered by NewsLook.com
As Sweden Hunts For Sub, "Cold War" Comparisons Flourish

As Sweden Hunts For Sub, "Cold War" Comparisons Flourish

Newsy (Oct. 19, 2014) With Sweden on the look-out for a suspected Russian sub, a lot of people are talking about the Cold War, but is it an apt comparison? Video provided by Newsy
Powered by NewsLook.com
So, Kangaroos Didn't Always Hop

So, Kangaroos Didn't Always Hop

Newsy (Oct. 16, 2014) Researchers believe an extinct kangaroo species weighed 500 pounds or more and couldn't hop. Video provided by Newsy
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:

Strange & Offbeat Stories


Plants & Animals

Earth & Climate

Fossils & Ruins

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins