title: Daily rhythms in antennal protein and olfactory sensitivity in the malaria mosquito Anopheles gambiae.
abstract: We recently characterized 24-hr daily rhythmic patterns of gene expression in Anopheles gambiae mosquitoes. These include numerous odorant binding proteins (OBPs), soluble odorant carrying proteins enriched in olfactory organs. Here we demonstrate that multiple rhythmically expressed genes including OBPs and takeout proteins, involved in regulating blood feeding behavior, have corresponding rhythmic protein levels as measured by quantitative proteomics. This includes AgamOBP1, previously shown as important to An. gambiae odorant sensing. Further, electrophysiological investigations demonstrate time-of-day specific differences in olfactory sensitivity of antennae to major host-derived odorants. The pre-dusk/dusk peaks in OBPs and takeout gene expression correspond with peak protein abundance at night, and in turn coincide with the time of increased olfactory sensitivity to odorants requiring OBPs and times of increased blood-feeding behavior. This suggests an important role for OBPs in modulating temporal changes in odorant sensitivity, enabling the olfactory system to coordinate with the circadian niche of An. gambiae.
authors.affiliation: 1] Department of Biological Sciences and Eck Institute for Global Health, Galvin Life Science Center, University of Notre Dame, Notre Dame, IN 46556 [2].
authors.forename: Samuel S C
authors.initials: SS
authors.lastname: Rund
authors.forename: Nicolle A
authors.initials: NA
authors.lastname: Bonar
authors.forename: Matthew M
authors.initials: MM
authors.lastname: Champion
authors.forename: John P
authors.initials: JP
authors.lastname: Ghazi
authors.forename: Cameron M
authors.initials: CM
authors.lastname: Houk
authors.forename: Matthew T
authors.initials: MT
authors.lastname: Leming
authors.forename: Zainulabeuddin
authors.initials: Z
authors.lastname: Syed
authors.forename: Giles E
authors.initials: GE
authors.lastname: Duffield
mesh_terms: D000818:Animals; D000852:Anopheles / Q000502:physiology*; D057506:Arthropod Antennae / Q000502:physiology*; D002940:Circadian Rhythm; D005247:Feeding Behavior; D005260:Female; D005426:Flight, Animal; D019476:Insect Proteins / Q000378:metabolism*; D008297:Male; D009830:Olfactory Bulb / Q000502:physiology*; D040901:Proteomics
chemical_list: D019476:Insect Proteins