Odorant Receptors Regulate the Final Glomerular Coalescence of Olfactory Sensory Neuron Axons

Overview

Journal Proc Natl Acad Sci U S A

Specialty Science

Date 2015 Apr 23

PMID 25902488

Citations 41

Authors

Diego J Rodriguez-Gil

Dianna L Bartel

Austin W Jaspers

Arie S Mobley

Fumiaki Imamura

Charles A Greer

Affiliations

Soon will be listed here.

Abstract

Odorant receptors (OR) are strongly implicated in coalescence of olfactory sensory neuron (OSN) axons and the formation of olfactory bulb (OB) glomeruli. However, when ORs are first expressed relative to basal cell division and OSN axon extension is unknown. We developed an in vivo fate-mapping strategy that enabled us to follow OSN maturation and axon extension beginning at basal cell division. In parallel, we mapped the molecular development of OSNs beginning at basal cell division, including the onset of OR expression. Our data show that ORs are first expressed around 4 d following basal cell division, 24 h after OSN axons have reached the OB. Over the next 6+ days the OSN axons navigate the OB nerve layer and ultimately coalesce in glomeruli. These data provide a previously unidentified perspective on the role of ORs in homophilic OSN axon adhesion and lead us to propose a new model dividing axon extension into two phases. Phase I is OR-independent and accounts for up to 50% of the time during which axons approach the OB and begin navigating the olfactory nerve layer. Phase II is OR-dependent and concludes as OSN axons coalesce in glomeruli.

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