Research

The lab currently has two major research directions: mosquito olfactory neurobiology and development of genetic tools in Drosophila and mosquitoes. We use behavioural experiments, live Ca2+imaging, molecular biology, genetics, immunohistochemistry and 3D modelling.

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3D reconstruction of mosquito Antennal Lobe - the part of the brain where smells are processed

Mosquitoes

Mosquitoes are important because they transmit deadly diseases such as malaria, yellow fever and Zika. Mosquitoes use their sense of smell to find humans and food, and to avoid harmful substances in their environment. However, we know little about how mosquito olfactory neurons work. Our work focussed of malaria mosquitoes Anopheles gambiae. We study both the aquatic larvae and the terrestrial adults.

Larvae of a malaria mosquito
Female of Anopheles gambiae after a blood meal

Mosquito olfactory neurobiology 

We have recently developed transgenic malaria mosquitoes Anopheles gambiae that, for the first time, allowed us to express GFP specifically in their olfactory neurons. Next, we wanted to find out what these neurons do. To start answering this question, we made a mosquito that carries a fluorescent activity indicator GCaMP. When expressed in the olfactory neurons of adult mosquitoes, GCaMP fluorescence showed that these neurons do not respond directly to artificial insect repellents,  but instead act by trapping molecules of attractive odorants.

Read more here:

Afify A, Betz JF, Riabinina O, Lahondere C, Potter CJ. (2019) Commonly used insect repellents hide human odors from Anopheles mosquitoes. Current Biology, 29, 1-12. link

Riabinina O, Task D, Marr E, Lin C-C, Alford R, O’Brochta DA, Potter CJ.  (2016) Organisation of olfactory centers in the malaria mosquito Anopheles gambiae. Nature Communications, 7, 13010. link

Head of a transgenic female mosquito, with GFP in olfactory neurons. Image by Cortney Akitake
Brain of the mosquito, shown on the left

Mosquito larvae also have olfactory neurons and can smell a range of attractive and repellent substances. Thus, it should be possible to control larval behaviour by using olfactory repellents and traps, just like is done with the adult mosquitoes. Olfactory system of larvae is much simpler than that of an adult mosquito, but remarkably little is known about it. We are now using GCaMP to monitor responses to odorants in vivo in the larvae. We are also assaying larval behaviour to see which odorants they find attractive or repellent.

Larval Y-maze, to test olfactory preference

Development of genetic tools

We are interested in developing novel genetic tools that can facilitate neuroscience research in fruit flies Drosophila and malaria mosquitoes Anopheles gambiae. We developed the second generation of Q-system in Drosophila and introduced the Q-system into A. gambiae by genetically labelling olfactory receptor neurons of the mosquitoes.

Our latest project has introduced split-QF into Drosophila and validated its use in a number of proof-of-principle experiments. We also confirmed that split-QF works with split-GAL4 and split-LexA, thus greatly expanding the possible applications of all three systems.

Read more here:

Riabinina O, Vernon SW, Dickson BJ, Baines RA. (2019) Split-QF system for fine-tuned transgene expression in DrosophilaGenetics, 212, 1, 53-63. link

Riabinina O, Task D, Marr E, Lin C-C, Alford R, O’Brochta DA, Potter CJ.  (2016) Organisation of olfactory centers in the malaria mosquito Anopheles gambiae. Nature Communications, 7, 13010. link

Riabinina O, Potter CJ. The Q-system: A versatile Expression System for Drosophila. In Drosophila: Methods and Protocols (ed: C. Dahmann) (Methods in Molecular Biology, Vol. 1478, 53-78) link

Riabinina O, Luginbuhl D, Marr E, Liu S, Wu MN, Luo L, Potter CJ. (2015) Improved and expanded Q-system reagents for genetic manipulations. Nature Methods, 12, 219-222  link

Drosophila brains, labelled with split-QF system

We are funded by:

LF-Logo-MASTER-HR