Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Ants have an exceptionally ‘hi-def’ sense of smell

11.09.2012
Ants have four to five times more odor receptors than most other insects, a team of researchers have discovered.

The research team, led by Lawrence Zwiebel at Vanderbilt, recently completed the first full map of olfactory system that provides ants with their sense of taste and smell.

They found the industrious insects have genes that make about 400 distinct odorant receptors, special proteins thatdetect different odors. By comparison, silk moths have 52, fruit flies have 61, mosquitoes range from 74 to 158 and honeybees have 174.

“The most exciting moment for me was when the analysis came back showing that we had identified more than 400 OR genes, the largest number of any known insect species,” said Xiaofan Zhou, the research associate who headed up the characterization process. “It meant that we had successfully taken the first step toward gaining a new level of understanding of the complex social system that has made ants one of the most successful families on the planet.”

People have long been intrigued and inspired by ants’ ability to form highly organized colonies with division of labor, communication between individuals and ability to solve complex problems. For some time, scientists have also known that chemical communication plays an important role in ant behavior. “So it’s a reasonable supposition that this dramatic expansion in odor-sensing capability is what allowed ants to develop such a high level of social organization,” said Laurence Zwiebel, professor of biological sciences, who directed the new study published in the Aug. 30 issue of the journal PLoS Genetics.

Zwiebel’s team characterized the olfactory systems of two distinctly different ant species as part of an interdisciplinary project titled “Epigenetics of Behavior, Longevity and Social Organization in Ants,” headed by Danny Reinberg of New York University and funded by the Howard Hughes Medical Institute. In 2010, the project sequenced the genomes of the two species – the Florida carpenter ant (Camponotus floridanus) and the Indian jumping ant (Harpegnathos saltator) – for the first time. This effort set the stage to make the detailed olfactory study possible.

The olfactory system of most insects is centered in their antennae and is broadly made up of three different classes of receptors: odorant receptors (ORs), that identify different aromatic compounds and pheromones; gustatory receptors (GRs), that distinguish between different tastes and react to some pheromones; and newly discovered ionotropic glutamate receptors (IRs), that are narrowly tuned to various poisonous and toxic compounds. The study found that the primary expansion in the ant’s olfactory system is focused on ORs. The number of GRs and IRs are comparable to thosefound in other insects.

The initial automated analysis of the two ant genomes found only about 100 genes for ORs and ten GRs. “We knew these numbers were low because olfactory receptors are very difficult to identify,” Zhou said. So he and his colleagues designed a novel automated bioinformatic process for this purpose, combined with extensive manual evaluation.

The researchers also compared both the identity and expression levels of ORs in the two species and found significant differences. This wasn’t surprising because the two species were selected to reflect the high level of diversity that exists within the ant family. Carpenter ants live in large colonies with long-lived queens that produce all the fertilized eggs.

There are two castes of sterile workers. When the queen dies so does the colony. Jumping ants, by contrast, live in small groups, the difference between the queen and workers is limited, and some workers can mate and lay fertilized eggs. “The differences in receptors are most probably associated with the difference in lifestyles of the two species,” Zhou said.

Similarly, their analysis found important differences in the ORs in the antennae of males and females. Overall, they found that the males have only one third the number of ORs that the females express. “The primary role of males is fertilization of eggs, so we assume that the ORs that males express and that females don’t are probably tuned to pheromones produced by the queen,” Zhou said.

The team also took the initial steps in identifying the chemical signals that set off specific ORs. Research Associate Jesse Slone adapted an assay that the group initially developed for matching ORs with chemical signals in the malaria mosquito. The assay involves inserting the gene for a receptor into frog eggs so that the receptors are expressed on the egg’s surface. By wiring the eggs and then exposing them to different chemical compounds, the eggs produce a measurable electric signal when the receptor is activated.

Slone used this assay to identify the compounds that trigger one OR on each of the ant species. He found that an aromatic compound found in anise triggered the OR from the jumping ant that he tested. The receptors were found in both males and workers. Since studies have shown that anise oil has a repellant and/or insecticidal effect on some species of insects, the compound may be a general insect repellent that this OR is designed to detect, Slone speculates.

By comparison, the OR from the carpenter ant turned out to react to a naturally occurring odorant found in cooked beef and pork. The scientists have no idea why this compound is relevant to the ants, but they did establish that the specific receptor is enhanced in workers, relative to males.

“This is just the beginning. But we have demonstrated that we have the basic tools we need to act as ‘OR detectives’ to map the ants ‘odor space’ and identify the chemical signals that trigger specific behaviors in the ant’s extensive repertoire,” Slone said.

This represents the opening of a major new research avenue for the Zwiebel Lab, which has been focused on pioneering work deconstructing the olfactory system of the malaria mosquito. “When I was in graduate school, a group of us dreamed about deciphering the role that genes might play in ant social behavior. So I couldn’t pass up this opportunity when it came along. It’s taken 30 years but we’ve finally gotten to the point where we can actually do these studies.”

Assistant Professor of Biological Sciences Antonis Rokis, Professor Shelley Berger at the University of Pennsylvania, Assistant Professor Jürgen Liebig at Arizona State University, Assistant Professor Anandasankar Ray at the University of California, Riverside and Professor Danny Reinberg at New York University also contributed to the study, which was funded by the Howard Hughes Medical Institute.

Visit Research News @ Vanderbilt for more research news from Vanderbilt. [Media Note: Vanderbilt has a 24/7 TV and radio studio with a dedicated fiber optic line and ISDN line. Use of the TV studio with Vanderbilt experts is free, except for reserving fiber time.]

David F. Salisbury | Vanderbilt University
Further information:
http://www.vanderbilt.edu

More articles from Life Sciences:

nachricht A novel socio-ecological approach helps identifying suitable wolf habitats
17.02.2017 | Universität Zürich

nachricht New, ultra-flexible probes form reliable, scar-free integration with the brain
16.02.2017 | University of Texas at Austin

All articles from Life Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Breakthrough with a chain of gold atoms

In the field of nanoscience, an international team of physicists with participants from Konstanz has achieved a breakthrough in understanding heat transport

In the field of nanoscience, an international team of physicists with participants from Konstanz has achieved a breakthrough in understanding heat transport

Im Focus: DNA repair: a new letter in the cell alphabet

Results reveal how discoveries may be hidden in scientific “blind spots”

Cells need to repair damaged DNA in our genes to prevent the development of cancer and other diseases. Our cells therefore activate and send “repair-proteins”...

Im Focus: Dresdner scientists print tomorrow’s world

The Fraunhofer IWS Dresden and Technische Universität Dresden inaugurated their jointly operated Center for Additive Manufacturing Dresden (AMCD) with a festive ceremony on February 7, 2017. Scientists from various disciplines perform research on materials, additive manufacturing processes and innovative technologies, which build up components in a layer by layer process. This technology opens up new horizons for component design and combinations of functions. For example during fabrication, electrical conductors and sensors are already able to be additively manufactured into components. They provide information about stress conditions of a product during operation.

The 3D-printing technology, or additive manufacturing as it is often called, has long made the step out of scientific research laboratories into industrial...

Im Focus: Mimicking nature's cellular architectures via 3-D printing

Research offers new level of control over the structure of 3-D printed materials

Nature does amazing things with limited design materials. Grass, for example, can support its own weight, resist strong wind loads, and recover after being...

Im Focus: Three Magnetic States for Each Hole

Nanometer-scale magnetic perforated grids could create new possibilities for computing. Together with international colleagues, scientists from the Helmholtz Zentrum Dresden-Rossendorf (HZDR) have shown how a cobalt grid can be reliably programmed at room temperature. In addition they discovered that for every hole ("antidot") three magnetic states can be configured. The results have been published in the journal "Scientific Reports".

Physicist Dr. Rantej Bali from the HZDR, together with scientists from Singapore and Australia, designed a special grid structure in a thin layer of cobalt in...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Booth and panel discussion – The Lindau Nobel Laureate Meetings at the AAAS 2017 Annual Meeting

13.02.2017 | Event News

Complex Loading versus Hidden Reserves

10.02.2017 | Event News

International Conference on Crystal Growth in Freiburg

09.02.2017 | Event News

 
Latest News

Switched-on DNA

20.02.2017 | Materials Sciences

Second cause of hidden hearing loss identified

20.02.2017 | Health and Medicine

Prospect for more effective treatment of nerve pain

20.02.2017 | Health and Medicine

VideoLinks
B2B-VideoLinks
More VideoLinks >>>