Non-neuronal expression of SARS-CoV-2 entry genes in the olfactory system suggests mechanisms underlying COVID-19-associated anosmia.

Journal Article (Journal Article)

Altered olfactory function is a common symptom of COVID-19, but its etiology is unknown. A key question is whether SARS-CoV-2 (CoV-2) - the causal agent in COVID-19 - affects olfaction directly, by infecting olfactory sensory neurons or their targets in the olfactory bulb, or indirectly, through perturbation of supporting cells. Here we identify cell types in the olfactory epithelium and olfactory bulb that express SARS-CoV-2 cell entry molecules. Bulk sequencing demonstrated that mouse, non-human primate and human olfactory mucosa expresses two key genes involved in CoV-2 entry, ACE2 and TMPRSS2. However, single cell sequencing revealed that ACE2 is expressed in support cells, stem cells, and perivascular cells, rather than in neurons. Immunostaining confirmed these results and revealed pervasive expression of ACE2 protein in dorsally-located olfactory epithelial sustentacular cells and olfactory bulb pericytes in the mouse. These findings suggest that CoV-2 infection of non-neuronal cell types leads to anosmia and related disturbances in odor perception in COVID-19 patients.

Full Text

Duke Authors

Cited Authors

  • Brann, DH; Tsukahara, T; Weinreb, C; Lipovsek, M; Van den Berge, K; Gong, B; Chance, R; Macaulay, IC; Chou, H-J; Fletcher, RB; Das, D; Street, K; de Bezieux, HR; Choi, Y-G; Risso, D; Dudoit, S; Purdom, E; Mill, J; Hachem, RA; Matsunami, H; Logan, DW; Goldstein, BJ; Grubb, MS; Ngai, J; Datta, SR

Published Date

  • July 31, 2020

Published In

Volume / Issue

  • 6 / 31

PubMed ID

  • 32937591

Electronic International Standard Serial Number (EISSN)

  • 2375-2548

Digital Object Identifier (DOI)

  • 10.1126/sciadv.abc5801


  • eng

Conference Location

  • United States