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Nat Commun. 2017 Oct 2;8(1):760. doi: 10.1038/s41467-017-01095-1.

Transcriptomes and neurotransmitter profiles of classes of gustatory and somatosensory neurons in the geniculate ganglion.

Author information

1
Department of Physiology & Biophysics, University of Miami Miller School of Medicine, Miami, FL, 33136, USA.
2
Graduate Program in Neurosciences, University of Miami Miller School of Medicine, Miami, FL, 33136, USA.
3
Department of Psychology, University of Virginia, Charlottesville, VA, 22904, USA.
4
Department of Otolaryngology, University of Miami Miller School of Medicine, Miami, FL, 33136, USA.
5
Department of Physiology & Biophysics, University of Miami Miller School of Medicine, Miami, FL, 33136, USA. nchaudhari@med.miami.edu.
6
Graduate Program in Neurosciences, University of Miami Miller School of Medicine, Miami, FL, 33136, USA. nchaudhari@med.miami.edu.
7
Department of Otolaryngology, University of Miami Miller School of Medicine, Miami, FL, 33136, USA. nchaudhari@med.miami.edu.

Abstract

Taste buds are innervated by neurons whose cell bodies reside in cranial sensory ganglia. Studies on the functional properties and connectivity of these neurons are hindered by the lack of markers to define their molecular identities and classes. The mouse geniculate ganglion contains chemosensory neurons innervating lingual and palatal taste buds and somatosensory neurons innervating the pinna. Here, we report single cell RNA sequencing of geniculate ganglion neurons. Using unbiased transcriptome analyses, we show a pronounced separation between two major clusters which, by anterograde labeling, correspond to gustatory and somatosensory neurons. Among the gustatory neurons, three subclusters are present, each with its own complement of transcription factors and neurotransmitter response profiles. The smallest subcluster expresses both gustatory- and mechanosensory-related genes, suggesting a novel type of sensory neuron. We identify several markers to help dissect the functional distinctions among gustatory neurons and address questions regarding target interactions and taste coding.Characterization of gustatory neural pathways has suffered due to a lack of molecular markers. Here, the authors report single cell RNA sequencing and unbiased transcriptome analyses to reveal major distinctions between gustatory and somatosensory neurons and subclusters of gustatory neurons with unique molecular and functional profiles.

PMID:
28970527
PMCID:
PMC5624912
DOI:
10.1038/s41467-017-01095-1
[Indexed for MEDLINE]
Free PMC Article

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