Navigation Links
Battle of the sexes, fruit-fly style
Date:11/24/2010

BOSTON, Mass. (Nov. 23, 2010) Pity the female fruit fly. Being a looker is simply not enough. To get a date, much less a proposal, you have to act like a girl, even smell like one. Otherwise, you might just have a fight on your hands.

Like most animals, fruit flies must distinguish between a potential mate and a potential competitor. When a male fruit fly suspects he's encountered a female, he'll court; when he senses the other is a male, he'll fight. What triggers these sex-specific responses?

According to new research by scientists at Harvard Medical School, the answer lies with both pheromonal profiles and behavioral patterns. The researchers investigated the effects of taste and action by manipulating a gene that governs both the sex specificity of a fruit fly's body-surface hydrocarbons, or pheromones, and the sex-linked behavioral cues that issue through the dense nerve-cell network that constitutes the fly's brain.

"These findings underscore the importance of behavioral feedback in the manifestation of aggression," says Edward Kravitz, the George Packer Berry Professor of Neurobiology at Harvard Medical School.

The research is published in the November 23 issue of PLoS Biology.

Mara de la Paz Fernndez and Yick-Bun Chan, post-doctoral researchers in the Kravitz lab, discovered these links to aggression when investigating whether a male fruit fly would ever attack a female. They focused on a particular gene called transformer, which is active in females but not in males. Through blocking transformer expression in a variety of different tissues in females, the researchers could specifically alter the "femaleness" or "maleness" of the pheromones, which in turn altered the patterns of aggressive behavior encoded in the fly's brain.

When they changed pheromone profiles so that females "tasted" like males, the researchers found that males would attack them. This indicated that pheromonal cues alone could label another fly as a competitor. But the researchers were surprised to discover that males also attacked "aggressive females"flies that still looked, smelled and tasted female but had been genetically altered to display male-like patterns of behavior.

When the researchers turned the tables by triggering the expression of transformer in males so as to feminize both the pheromonal and behavioral profiles, control males showed no aggression toward the transformed males. Instead, they began to court them. These results show that it is possible to completely reverse normal behavioral responses by presenting males with unanticipated and conflicting sensory cues.

"Future studies will aim at unraveling the neuronal circuitry that governs this type of decision-making behavior, as such decisions are essential for survival," says Kravitz. "With the powerful genetic methods available in fly neurobiology, it should be possible to dissect the decision-making circuitry at far greater levels of detail than have heretofore been possible in other species."

"This study addresses a classic question in animal behavior: What motivates an individual to do X rather than Y, or vice versa," said Laurie Tompkins, Ph.D., who manages Kravitz's and other behavioral genetics grants at the National Institutes of Health. "Because the general principles of how behaviors are controlled are conserved among species, Kravitz's conclusions about how flies make simple choices may illuminate how humans and other animals make more complex decisions."


'/>"/>

Contact: David Cameron
david_cameron@hms.harvard.edu
617-432-0441
Harvard Medical School
Source:Eurekalert

Related biology technology :

1. BD and FIND Achieve Milestone in Global Battle Against MDR-TB
2. Intensive Lifestyle Intervention Program for Overweight or Obese Patients with Nonalcoholic Steatohepatitis Reduces Weight and Improves Overall Liver Health
3. BodyMedia, Inc. Launches GowearFit, the First Direct-to-Consumer Lifestyle and Calorie Management System
4. Photos: Project Runways Tim Gunn Launches Addressing Psoriasis(TM) Campaign to Advocate That Patients Shouldnt Let Psoriasis Impact Personal Style
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:4/20/2017)... Life Sciences Inc. (TSX: PLI) (OTCQX: PFSCF) ("Prometic" or the ... ("ILC") 2017 of the European Association for the Study of ... the positive effects of PBI-4050 on reduction of non-alcoholic steatohepatitis ... ... Gagnon, Vice-President of R&D Pre-clinical of Prometic "This extensive preclinical ...
(Date:4/20/2017)... MN and Bethesda, MD (PRWEB) , ... April ... ... Advancing Innovation announce the formation of a unique intellectual property (IP) sharing and ... potential of their most promising inventions. A main component of this effort is ...
(Date:4/20/2017)... For today, Stock-Callers.com redirects investors, attention ... and clinical research aimed at treating diseases and medical conditions. ... Biopharmaceuticals Inc. (NASDAQ: KERX), Kite Pharma Inc. (NASDAQ: KITE), and ... access our complimentary research reports on these stocks now at: ... http://stock-callers.com/registration ...
(Date:4/19/2017)... ... ... Alisa Wright, founder and CEO of Singota Solutions , has received ... Lafayette, Indiana. , The Distinguished Alumni Award was established in 1984 to honor ... endeavors. , Wright began her career in the pharmaceutical industry with firms such ...
Breaking Biology Technology:
(Date:3/13/2017)... Germany , March 13, 2017 Future of security: ... ... DERMALOGs Face Matching enables to match face ... forms the basis to identify individuals. (PRNewsFoto/Dermalog Identification Systems) ... DERMALOG,s "Face Matching" is the fastest software for biometric ...
(Date:3/9/2017)... MOUNTAIN VIEW, Calif. , March 9, 2017 /PRNewswire/ ... 23andMe , the leading personal genetics company, are ... can now provide customers with personalized nutrition plans that ... biometrics, but also genetic markers impacting how their body ... personalized food decision support platform uses biometrics such as ...
(Date:3/7/2017)... SALT LAKE CITY , March 7, 2017 /PRNewswire/ ... solutions that help top global companies identify the best ... Leonard as Chief Sales Officer (CSO) and ... and Kucer,s appointments round out a seasoned executive team poised ... year and beyond, building on a year of record ...
Breaking Biology News(10 mins):