Zebrafish crypt neurons project to a single, identified mediodorsal glomerulus

• Published in: Scientific reports Vol. 3; no. 1; p. 2063
• Main Authors: Ahuja, Gaurav, Ivandić, Ivan, Saltürk, Mehmet, Oka, Yuichiro, Nadler, Walter, Korsching, Sigrun I.
• Format: Journal Article
• Language: English
• Published: London Nature Publishing Group UK 24-06-2013; Nature Publishing Group
• Subjects: 631/337; 631/378/2624/1703; 631/378/2624/2625; 631/80; Animals; Antibodies; Axons; Base Sequence; DNA Primers; Humanities and Social Sciences; Immunoreactivity; Labeling; Morphology; Morphometry; multidisciplinary; Neurons; Neurons - cytology; Odorant receptors; Olfactory Bulb - cytology; Olfactory glomeruli; Olfactory receptor neurons; Population; Proteins; Quantitative analysis; Reverse Transcriptase Polymerase Chain Reaction; Science; TrkA protein; TrkA receptors; Zebrafish
• ISSN: 2045-2322; 2045-2322
• DOI: 10.1038/srep02063

Crypt neurons are a third type of olfactory receptor neurons with a highly unusual “one cell type - one receptor” mode of expression, the same receptor being expressed by the entire population of crypt neurons. Attempts to identify the target region(s) of crypt neurons have been inconclusive so far. We report that TrkA-like immunoreactivity specifically labeled somata, axons and terminals of zebrafish crypt neurons and reveal a single glomerulus, mdg2 of the dorsomedial group, as target glomerulus of crypt neurons. Injection of a fluorescent tracing dye into the mdg2 glomerulus retrogradely labeled mostly crypt neurons, as assessed by quantitative morphometry, whereas no crypt neurons were found after injections in neighboring glomeruli. Our data provide strong evidence that crypt neurons converge onto a single glomerulus and thus form a labeled line consisting of a single sensory cell type, a single olfactory receptor and a single target glomerulus.