How cells in the nose detect odors

Nov 14, 2012
New research by UC Riverside and Stanford University scientists identifying a braking mechanism in olfactory neurons is featured on the cover of the Nov. 15, 2012, issue of the journal Genes & Development. Credit: Genes & Development

The human nose has millions of olfactory neurons grouped into hundreds of different neuron types. Each of these neuron types expresses only one odorant receptor, and all neurons expressing the same odorant receptor plug into one region in the brain, an organization that allows for specific odors to be sensed.

For example, when you smell a rose, only those that express a specific odor receptor that detects a chemical the rose emits get activated, which in turn activates a specific region in the brain. on the other hand, activate a different class of neurons that express a different (rotten egg) receptor and activate a different . How the one-receptor-per-neuron pattern—critical for odor discrimination—is achieved in is a mystery that has frustrated scientists for long.

Now a team of scientists, led by neurobiologists at the University of California, Riverside, has an explanation. Focusing on the olfactory receptor for detecting in Drosophila (fruit fly), the researchers identified a large multi- complex in olfactory neurons, called MMB/dREAM, that plays a major role in selecting the carbon dioxide receptors to be expressed in appropriate neurons.

Study results appear in the Nov. 15 issue of Genes & Development. The research is featured on the cover of the issue.

Braking mechanism

According to the researchers, a molecular mechanism first blocks the expression of most olfactory receptor genes (~60) in the fly's antennae. This mechanism, which acts like a brake, relies on repressive histones —proteins that tightly wrap DNA around them. All insects and mammals are equipped with this mechanism, which keeps the large families of olfactory receptor genes repressed.

"How, then, do you release this brake so that only the carbon dioxide receptor is expressed in the carbon dioxide neuron while the remaining receptors are repressed?" said Anandasankar Ray, an assistant professor of entomology, whose lab conducted the research. "Our lab, in collaboration with a lab at Stanford University, has found that the MMB/dREAM multi-protein complex can act on the of the carbon dioxide receptors and de-repress the braking mechanism—akin to taking the foot off the brake pedal. This allows these neurons to express the receptors and respond to carbon dioxide."

Ray explained that one way to understand the mechanism in operation is to consider a typewriter. When none of the keys are pressed, a spring mechanism or "brake" can be imagined to hold the type bars away from the paper. When a key is pressed, however, the brake on that key is overcome and the appropriate letter is typed onto the paper. And just as typing only one letter in one spot is important for each letter to be recognized, expressing one receptor in one neuron lets different sensor types to be generated in the nose.

"If this were not the case, a single cell would express several receptors and there would be no diversity in sensor types," Ray said. "Our study then attempts to answer a fundamental question in neurobiology: How do we generate so much cellular diversity in the nervous system?"

Next, the researchers will test whether the receptor-braking mechanism they identified in Drosophila is also involved in other organisms like mosquitoes. They also will examine the other receptors in Drosophila to explain what de-represses each one of them.

Modulating response levels

The researchers also found that the activity of the MMB/dREAM multi-protein complex in Drosophila can alter levels of the carbon dioxide receptor and modulate the level of response to carbon dioxide.

"If you dial down the activity of the complex, you also dial down the expression of the carbon dioxide receptors, and the flies cannot sense carbon dioxide effectively," Ray said. "What's particularly encouraging is that this complex is highly conserved in mosquitoes as well, which means that we may be able to dial down the activity of this complex in mosquitoes using genetic strategies, and potentially lower the ability of mosquitoes to sense carbon dioxide, used by them to find human hosts. Because carbon dioxide receptors are so well conserved in mosquitoes, we expect that the regulatory mechanism we discovered in Drosophila may also be acting on mosquito carbon dioxide receptors."

Antenna versus maxillary palp

Interestingly, flies sense carbon dioxide with receptors located in their antennae, and avoid the source. Mosquitoes, on the other hand, are attracted to carbon dioxide and use receptors located not on their antenna but another organ called the maxillary palps (small structures present near the mouthparts). The research team found that two specific proteins in the multi-protein MMB/dREAM complex in mosquitoes have sequences that are quite different from those of the corresponding proteins in Drosophila.

"These proteins—E2F2 and Mip120—could explain why Drosophila expresses carbon dioxide in the antennae while the mosquito expresses them in its maxillary palp," Ray said.

Explore further: Reading a biological clock in the dark

add to favorites email to friend print save as pdf

Related Stories

Recommended for you

Crowdsourced power to solve microbe mysteries

11 hours ago

University of New South Wales scientists hope to unlock the secrets of millions of marine microbes from waters as far apart as Sydney's Botany Bay and the Amazon River in Brazil, with the help of an international ...

Reading a biological clock in the dark

Oct 21, 2014

Our species' waking and sleeping cycles – shaped in millions of years of evolution – have been turned upside down within a single century with the advent of electric lighting and airplanes. As a result, ...

User comments : 0