Navigation Links
Dopamine turns worker ants into warrior queens
Date:5/12/2014

The ritualized fighting behavior of one ant species is linked to increases in dopamine levels that trigger dramatic physical changes in the ants without affecting their DNA, according to research from North Carolina State University, Arizona State University and the U.S. Department of Agriculture.

The researchers studied Indian jumping ants (Harpegnathos saltator), which can undergo significant changes in physiology without any related changes to their DNA. Instead, the changes depend on which genes are turned on or off which in turn is determined by social and environmental factors. This has made them a model organism for epigenetics researchers.

When an H. saltator colony's queen dies, the female workers engage in ritual fights to establish dominance. While these battles can be fierce, they rarely result in physical injury to the workers. Ultimately, a group of approximately 12 workers will establish dominance and become a cadre of worker queens or "gamergates." Video of the ritualized fighting behavior can be seen at https://www.youtube.com/watch?v=74ruqyOUX-8.

The gamergates look like ordinary workers, but undergo extreme internal changes: their brains shrink by 25 percent; their ovaries expand to fill their abdomens; and their life expectancy jumps from about six months to several years or more.

"We wanted to know what's responsible for these physical changes," says Dr. Clint Penick, lead author of a paper describing the work and a postdoctoral researcher at NC State. "The answer appears to be dopamine. We found that gamergates have dopamine levels two to three times higher than other workers."

To understand what was happening, the researchers took a subset of workers from a colony (Colony A) and separated them from their gamergates. These workers effectively formed their own colony (Colony B) and began fighting to establish dominance.

When some of the workers in Colony B began to get the upper hand, Penick removed them from the colony. He found that these dominant ants had already begun to produce elevated levels of dopamine more than other workers, but still less than full-fledged gamergates.

Penick then placed these dominant workers back into Colony A. The regular Colony A workers recognized the changes in the dominant workers and exhibited "policing" behavior, holding down the dominant ants so that they couldn't move. Within 24 hours, the dopamine levels in the dominant workers had dropped back to normal; they were just regular worker ants again.

"This tells us that the very act of winning these ritual battles increases dopamine levels in H. saltator, which ultimately leads to the physical changes we see in gamergates," Penick says. "Similarly, losing these fights pushes dopamine levels down."

The findings may offer insight into the behavior of a range of social insect species, Penick says. "Policing behavior occurs in wasps and other ant species, and this study shows just how that behavior can regulate hormone levels to affect physiology and ensure that workers don't reproduce," he explains.


'/>"/>

Contact: Matt Shipman
matt_shipman@ncsu.edu
919-515-6386
North Carolina State University
Source:Eurekalert  

Related biology news :

1. Dopamine-receptor gene variant linked to human longevity
2. New research about facial recognition turns common wisdom on its head
3. Commonly used pesticide turns honey bees into picky eaters
4. NTUs new loo turns poo into power
5. EyeLock Inc. Introduces EyeSwipe Nano TS Iris Scanning Turnstile Solution for Secure Access Control
6. How silver turns people blue
7. Gene find turns soldier beetle defence into biotech opportunity
8. GEOLOGY returns to Naica Cave, Mexico, and extends its reach to Mercury
9. Study turns parasite invasion theory on its head
10. Dance of water molecules turns fire-colored beetles into antifreeze artists
11. UCI research turns the corner on autism
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Dopamine turns worker ants into warrior queens
(Date:11/29/2016)... Nearly one billion matches per second with DERMALOG,s high-speed AFIS    ... ... DERMALOG is Germany's largest Multi-Biometric supplier: The company's Fingerprint ... ... Multi-Biometric supplier: The company's Fingerprint Identification System is part of an efficient ...
(Date:11/24/2016)... Calif. , Nov. 23, 2016 Cercacor ... endurance athletes and their trainers non-invasively measure ... Index, Pulse Rate, and Respiration Rate in approximately 30 ... enables users easy and immediate access to key data ... part of a training regimen. Hemoglobin ...
(Date:11/22/2016)... , Nov. 22, 2016   MedNet Solutions ... the entire spectrum of clinical research, is pleased to ... Medical LiveWire Healthcare and Life Sciences Awards as ... caps off an unprecedented year of recognition and growth ... for over 15 years. iMedNet ...
Breaking Biology News(10 mins):
(Date:12/2/2016)... ... 02, 2016 , ... In anticipation of AxioMed’s exclusive cleanroom ... company President, Jake Lubinski will be traveling to Switzerland from December 5-10. Mr. ... Lucerne, and Zurich to discuss the benefits of a viscoelastic disc. AxioMed received ...
(Date:12/2/2016)... ANGELES , Dec. 2, 2016 CytRx ... and development company specializing in oncology, today announced the ... noted sarcoma surgeon, industry consultant, and private healthcare investor, ... is a healthcare leader with clinical and strategic experience ... , CytRx,s Chairman and CEO. "As one of the ...
(Date:12/2/2016)... ... December 01, 2016 , ... ... for North American hospitals, will present its chain-of-custody solution for tracking and securing ... Las Vegas, Nev., Dec. 4-8, 2016. , Aerocom has a proven solution for ...
(Date:12/2/2016)... ... December 01, 2016 , ... ... Nanowear on their recent FDA Class II 510(k) clearance for their flagship medical ... in commercializing remote cardiac monitoring devices that rely on cloth-based nanosensors. While other ...
Breaking Biology Technology: