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CO2 sensing by Connexin26 and its role in the control of breathing

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Dale, Nicholas (2021) CO2 sensing by Connexin26 and its role in the control of breathing. Interface Focus . doi:10.1098/rsfs.2020.0029 (In Press)

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Official URL: http://dx.doi.org/10.1098/rsfs.2020.0029

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Abstract

Breathing is essential to provide the O2 required for metabolism and to remove its inevitable CO2 by-product. The rate and depth of breathing is controlled to regulate the excretion of CO2 to maintain the pH of arterial blood at physiological values. A widespread consensus is that chemosensory cells in the carotid body and brainstem measure blood and tissue pH and adjust the rate of breathing to ensure its homeostatic regulation. In this review, I shall consider the evidence that underlies this consensus and highlight historical data indicating that direct sensing of CO2 also plays a significant role in the regulation of breathing. I shall then review work from my laboratory that provides a molecular mechanism for the direct detection of CO2 via the gap junction protein connexin26 (Cx26) and demonstrates the contribution of this mechanism to the chemosensory regulation of breathing. As there are many pathological mutations of Cx26 in humans, I shall discuss which of these alter the CO2 sensitivity of Cx26 and the extent to which these mutations could affect human breathing. I finish by discussing the evolution of the CO2 sensitivity of Cx26 and its link to the evolution of amniotes.

Item Type: Journal Article
Subjects: Q Science > QH Natural history
Q Science > QP Physiology
R Medicine > RA Public aspects of medicine
Divisions: Faculty of Science > Life Sciences (2010- )
Library of Congress Subject Headings (LCSH): Hypercapnia , Carbon dioxide -- Physiological effect , Connexins , Gap junctions (Cell biology)
Journal or Publication Title: Interface Focus
Publisher: The Royal Society Publishing
ISSN: 2042-8898
Official Date: 12 February 2021
Dates:
DateEvent
12 February 2021Published
9 December 2020Accepted
Date of first compliant deposit: 11 December 2020
DOI: 10.1098/rsfs.2020.0029
Status: Peer Reviewed
Publication Status: In Press
Publisher Statement: Dale, Nicholas (2021) CO2 sensing by Connexin26 and its role in the control of breathing. Interface Focus . doi:10.1098/rsfs.2020.0029
Access rights to Published version: Open Access
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
UNSPECIFIEDMedical Research Councilhttp://dx.doi.org/10.13039/501100000265
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