Non-redundant odor coding by sister mitral cells revealed by light addressable glomeruli in the mouse.
Sensory inputs frequently converge on the brain in a spatially organized manner, often with overlapping inputs to multiple target neurons. Whether the responses of target neurons with common inputs become decorrelated depends on the contribution of local circuit interactions. We addressed this issue in the olfactory system using newly generated transgenic mice that express channelrhodopsin-2 in all of the olfactory sensory neurons. By selectively stimulating individual glomeruli with light, we identified mitral/tufted cells that receive common input (sister cells). Sister cells had highly correlated responses to odors, as measured by average spike rates, but their spike timing in relation to respiration was differentially altered. In contrast, non-sister cells correlated poorly on both of these measures. We suggest that sister mitral/tufted cells carry two different channels of information: average activity representing shared glomerular input and phase-specific information that refines odor representations and is substantially independent for sister cells.
Cold Spring Harbor Laboratory, Cold Spring Harbor, New York, USA.
Ashesh K
AK
Dhawale
Akari
A
Hagiwara
Upinder S
US
Bhalla
Venkatesh N
VN
Murthy
Dinu F
DF
Albeanu
D018750:6-Cyano-7-nitroquinoxaline-2,3-dione / Q000494:pharmacology; D000200:Action Potentials / Q000187:drug effects / Q000502:physiology; D000818:Animals; D000075402:Channelrhodopsins; D018691:Excitatory Amino Acid Antagonists / Q000494:pharmacology; D049452:Green Fluorescent Proteins / Q000235:genetics; D008027:Light; D051379:Mice; D008822:Mice, Transgenic; D009415:Nerve Net / Q000187:drug effects / Q000502:physiology*; D009433:Neural Inhibition / Q000502:physiology; D009812:Odorants; D009830:Olfactory Bulb / Q000166:cytology* / Q000502:physiology; D051842:Olfactory Marker Protein / Q000235:genetics; D009833:Olfactory Pathways / Q000502:physiology; D011984:Sensory Receptor Cells / Q000187:drug effects / Q000502:physiology*; D013223:Statistics as Topic; D013995:Time; D014633:Valine / Q000031:analogs & derivatives / Q000494:pharmacology
D000075402:Channelrhodopsins; D018691:Excitatory Amino Acid Antagonists; D051842:Olfactory Marker Protein; C497598:Omp protein, mouse; C485184:enhanced green fluorescent protein; D049452:Green Fluorescent Proteins; D018750:6-Cyano-7-nitroquinoxaline-2,3-dione; C056639:2-amino-5-phosphopentanoic acid; D014633:Valine