Amplification of Olfactory Signals by Anoctamin 9 is Essential for Mammalian Olfaction: a Risk Factor for the Covid-19-associated Anosmia
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Abstract
Sensing smells of foods, prey, or predators determines animal survival. Olfactory sensory neurons in the olfactory epithelium (OE) detect odorants, where cAMP and Ca 2+ play a significant role in transducing odorant inputs to electrical activity. Here we show Anoctamin 9, a cation channel activated by cAMP/PKA pathway, is expressed in the OE and amplifies olfactory signals. Ano9 - deficient mice had reduced olfactory behavioral sensitivity, electro-olfactogram signals, and neural activity in the olfactory bulb. In line with the difference in olfaction between birds and other vertebrates, chick ANO9 failed to respond to odorants, whereas chick CNGA2, a major transduction channel, showed greater responses to cAMP. Importantly, single-cell transcriptome data from Covid-19 patients revealed that Ano9 transcripts were markedly suppressed among genes in the olfactory signal pathway. The signal amplification by ANO9 is essential for mammalian olfactory transduction, whose downregulation may be a risk factor for the olfactory dysfunction in Covid-19 patients.
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SciScore for 10.1101/2022.03.02.482745: (What is this?)
Please note, not all rigor criteria are appropriate for all manuscripts.
Table 1: Rigor
Ethics Consent: Due to the domestic law that cadavers must be donated and managed under informed consent and ethical process, the institutional review board (IRB) of The Catholic University of Korea has decreed that studies involving cadavers do not need to be reviewed.
IRB: Due to the domestic law that cadavers must be donated and managed under informed consent and ethical process, the institutional review board (IRB) of The Catholic University of Korea has decreed that studies involving cadavers do not need to be reviewed.
Euthanasia Agents: Briefly, male and female adult mice (9-12 weeks old) were anesthetized with intraperitoneal injection of Ketamine/Xylazine (90 mg/10 mg/kg).Sex as a biological … SciScore for 10.1101/2022.03.02.482745: (What is this?)
Please note, not all rigor criteria are appropriate for all manuscripts.
Table 1: Rigor
Ethics Consent: Due to the domestic law that cadavers must be donated and managed under informed consent and ethical process, the institutional review board (IRB) of The Catholic University of Korea has decreed that studies involving cadavers do not need to be reviewed.
IRB: Due to the domestic law that cadavers must be donated and managed under informed consent and ethical process, the institutional review board (IRB) of The Catholic University of Korea has decreed that studies involving cadavers do not need to be reviewed.
Euthanasia Agents: Briefly, male and female adult mice (9-12 weeks old) were anesthetized with intraperitoneal injection of Ketamine/Xylazine (90 mg/10 mg/kg).Sex as a biological variable Human Samples: Two tissue samples of the human OE were acquired from two male cadavers (age: 68 years and 80 years). Randomization not detected. Blinding not detected. Power Analysis not detected. Cell Line Authentication not detected. Table 2: Resources
Antibodies Sentences Resources KLH/BSA conjugation was performed for effective immunization and generation of anti-peptide antibodies. anti-peptidesuggested: Nonemonoclonal anti-c-Fos antibody (1:1000, ab208942, Abcam), Tuj-1 (1:500, T5076, Sigma), Ac-Tub (1:500, T7451, Sigma), or olfactory marker protein (1:200, 019-22291, FUJIFILM Wako Chemicals) was diluted in 0.1% Triton X-100 in 1 x PBS containing 1% bovine serum albumin. anti-c-Fossuggested: (Abcam Cat# ab208942, RRID:AB_2747772)Tuj-1suggested: NoneAc-Tubsuggested: NoneThe cell lysates were mixed with anti-ANO9 antibodies and incubated overnight in 4°C. anti-ANO9suggested: NoneThen, these immunoprecipitants were blotted with anti- phosphoserine antibodies Statistical analysis: All results are expressed as means ± standard errors (S.E.). anti- phosphoserinesuggested: NoneExperimental Models: Cell Lines Sentences Resources The transfected HEK 293T cells were incubated at 5% CO2 at 37◦C in the Dulbecco’s modified Eagle’s medium supplemented with 10% fetal bovine serum, 10 units/ml penicillin, and 10 μg/ml streptomycin. HEK 293Tsuggested: NoneExperimental Models: Organisms/Strains Sentences Resources Adult male and female C57BL/6 background, transgenic, and Ano9 KO mice were used for electrophysiological recordings, in-vivo Ca2+ imaging, or behavioral tests. C57BL/6suggested: NoneTo delete Ano9 in the whole body, the mice genotyped for the presence of the loxP sites (Ano9fl/fl) were crossed with B6.C-Tg(CMV-cre)1Cgn/J (CMV-cre) to produce CMV-cre;Ano9fl/- mice. B6.C-Tg(CMV-cre)1Cgn/Jsuggested: RRID:IMSR_JAX:006054)CMV-cre;Ano9fl/-suggested: NoneThe CMV-cre;Ano9fl/- mice were crossed with Ano9fl/fl mice to generate Ano9 deficient mice (CMV-cre;Ano9fl/fl). Ano9fl/flsuggested: NoneCMV-cre;Ano9fl/flsuggested: NoneRecombinant DNA Sentences Resources We subcloned chick Ano9 into pEGFP-N1 vector from the XM_015286257.2:1133-3649 PREDICTED: Gallus gallus anoctamin 9 (Ano9), transcript variant X3, mRNA. pEGFP-N1suggested: RRID:Addgene_172284)Software and Algorithms Sentences Resources Imaging data were analyzed with NeuroPlex. NeuroPlexsuggested: (NeuroPlex, RRID:SCR_016193)The electrical signals were digitized at 500 Hz and analyzed using pClamp 10. pClampsuggested: (pClamp, RRID:SCR_011323)Multiple sequence alignment was obtained using the CLUSTAL OMEGA program (https://www.ebi.ac.uk/Tools/msa/clustalo/) to compare the ANO9 sequences of various species. CLUSTAL OMEGAsuggested: (Clustal Omega, RRID:SCR_001591)The analysis was performed with tailored Python and R scripts utilizing the following packages: Scanpy (v.1.7.1) 82 was used to import data and SciPy (v.1.4.1) for t-test 83 (see Code availability) Pythonsuggested: (IPython, RRID:SCR_001658)SciPysuggested: (SciPy, RRID:SCR_008058)Results from OddPub: We did not detect open data. We also did not detect open code. Researchers are encouraged to share open data when possible (see Nature blog).
Results from LimitationRecognizer: An explicit section about the limitations of the techniques employed in this study was not found. We encourage authors to address study limitations.Results from TrialIdentifier: No clinical trial numbers were referenced.
Results from Barzooka: We did not find any issues relating to the usage of bar graphs.
Results from JetFighter: We did not find any issues relating to colormaps.
Results from rtransparent:- Thank you for including a conflict of interest statement. Authors are encouraged to include this statement when submitting to a journal.
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- No protocol registration statement was detected.
Results from scite Reference Check: We found no unreliable references.
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