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Such slow brain rhythms typically have a lower frequency than tonic action-potential firing. They are assumed to arise from network-level mechanisms, involving synaptic interactions and delays, or from intrinsically bursting neurons. Neuronal burst generation is commonly attributed to ion channels with slow kinetics. Here, we explore an alternative mechanism generically available to all neurons with class I excitability. It is based on the interplay of fast-spiking voltage dynamics with a one-dimensional slow dynamics of the extracellular potassium concentration, mediated by the activity of the Na<jats:sup>+<\/jats:sup>\/K<jats:sup>+<\/jats:sup>-ATPase. We use bifurcation analysis of the complete system as well as the slow-fast method to reveal that this coupling suffices to generate a hysteresis loop organized around a bistable region that emerges from a saddle-node loop bifurcation\u2013a common feature of class I excitable neurons. Depending on the strength of the Na<jats:sup>+<\/jats:sup>\/K<jats:sup>+<\/jats:sup>-ATPase, bursts are generated from pump-induced shearing the bifurcation structure, spiking is tonic, or cells are silenced via depolarization block. We suggest that transitions between these dynamics can result from disturbances in extracellular potassium regulation, such as glial malfunction or hypoxia affecting the Na<jats:sup>+<\/jats:sup>\/K<jats:sup>+<\/jats:sup>-ATPase activity. The identified minimal mechanistic model outlining the sodium-potassium pump\u2019s generic contribution to burst dynamics can, therefore, contribute to a better mechanistic understanding of pathologies such as epilepsy syndromes and, potentially, inform therapeutic strategies.<\/jats:p>","DOI":"10.1371\/journal.pcbi.1011751","type":"journal-article","created":{"date-parts":[[2024,8,12]],"date-time":"2024-08-12T17:36:04Z","timestamp":1723484164000},"page":"e1011751","update-policy":"https:\/\/doi.org\/10.1371\/journal.pcbi.corrections_policy","source":"Crossref","is-referenced-by-count":7,"title":["The Na+\/K+-ATPase generically enables deterministic bursting in class I neurons by shearing the spike-onset bifurcation structure"],"prefix":"10.1371","volume":"20","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-7047-4979","authenticated-orcid":true,"given":"Mahraz","family":"Behbood","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9260-2521","authenticated-orcid":true,"given":"Louisiane","family":"Lemaire","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jan-Hendrik","family":"Schleimer","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3913-5650","authenticated-orcid":true,"given":"Susanne","family":"Schreiber","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"340","published-online":{"date-parts":[[2024,8,12]]},"reference":[{"key":"pcbi.1011751.ref001","doi-asserted-by":"crossref","first-page":"687","DOI":"10.1152\/physrev.1996.76.3.687","article-title":"Principles of rhythmic motor pattern generation","volume":"76","author":"E Marder","year":"1996","journal-title":"Physiol Rev"},{"key":"pcbi.1011751.ref002","doi-asserted-by":"crossref","first-page":"665","DOI":"10.1016\/j.conb.2004.10.011","article-title":"Pacemaker neurons and neuronal networks: An integrative view","volume":"14","author":"J-M Ramirez","year":"2005","journal-title":"Curr Opin Neurobiol"},{"key":"pcbi.1011751.ref003","doi-asserted-by":"crossref","first-page":"569","DOI":"10.1016\/j.neuron.2011.08.001","article-title":"The Nodal Origin of Intrinsic Bursting","volume":"71","author":"D. 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