{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,9]],"date-time":"2026-04-09T18:18:10Z","timestamp":1775758690136,"version":"3.50.1"},"reference-count":53,"publisher":"The Company of Biologists","license":[{"start":{"date-parts":[[2020,1,1]],"date-time":"2020-01-01T00:00:00Z","timestamp":1577836800000},"content-version":"am","delay-in-days":0,"URL":"http:\/\/www.biologists.com\/user-licence-1-1\/"}],"funder":[{"name":"French Government"},{"name":"F\u00e9d\u00e9ration de Recherche BioEnviS","award":["FR3728"],"award-info":[{"award-number":["FR3728"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"abstract":"<jats:p>Mass-specific metabolic rate negatively co-varies with body mass from the whole-animal to the mitochondrial levels. Mitochondria are the mainly consumers of oxygen inspired by mammals to generate ATP or compensate energetic losses dissipated as the form of heat (proton leak) during oxidative phosphorylation. Consequently, ATP synthesis and proton leak thus compete for the same electrochemical gradient. Because proton leak co-varies negatively with body mass, it is unknown if extremely small mammals further decouple their mitochondria to maintain their body temperature or if they implement metabolic innovations to ensure cellular homeostasis. The present study investigates the impact of body mass variation on cellular and mitochondrial functioning in small mammals, comparing the two extremely small African pygmy mice (Mus mattheyi, approx. 5 g and Mus minutoides, approx. 7 g) with the larger house mouse (Mus musculus, approx. 22 g). Oxygen consumption rates were measured from the animal to the mitochondrial levels. We also measured mitochondrial ATP synthesis in order to appreciate the mitochondrial efficiency (ATP\/O). At the whole-animal scale, mass- and surface-specific metabolic rates co-varied negatively with body mass, whereas this was not necessarily the case at cellular and mitochondrial levels. M. mattheyi had generally the lowest cellular and mitochondrial fluxes, depending on the tissue considered (liver or skeletal muscle), as well as having higher efficient muscle mitochondria than the other two species. M. mattheyi presents metabolic innovations to ensure its homeostasis, by generating more ATP per oxygen consumed.<\/jats:p>","DOI":"10.1242\/jeb.215558","type":"journal-article","created":{"date-parts":[[2020,2,10]],"date-time":"2020-02-10T15:45:16Z","timestamp":1581349516000},"source":"Crossref","is-referenced-by-count":14,"title":["Improved mitochondrial coupling as a response to high mass-specific metabolic rate in extremely small mammals"],"prefix":"10.1242","author":[{"given":"Bo\u00ebl","family":"M\u00e9lanie","sequence":"first","affiliation":[{"name":"Laboratoire d'Ecologie des Hydrosyst\u00e8mes Naturels et Anthropis\u00e9s (UMR CNRS 5023), Universit\u00e9 Claude Bernard Lyon1, Universit\u00e9 de Lyon; Bd du 11 novembre 1918, B\u00e2t. Darwin C; 69622 Villeurbanne Cedex, France"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Romestaing","family":"Caroline","sequence":"additional","affiliation":[{"name":"Laboratoire d'Ecologie des Hydrosyst\u00e8mes Naturels et Anthropis\u00e9s (UMR CNRS 5023), Universit\u00e9 Claude Bernard Lyon1, Universit\u00e9 de Lyon; Bd du 11 novembre 1918, B\u00e2t. Darwin C; 69622 Villeurbanne Cedex, France"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Duchamp","family":"Claude","sequence":"additional","affiliation":[{"name":"Laboratoire d'Ecologie des Hydrosyst\u00e8mes Naturels et Anthropis\u00e9s (UMR CNRS 5023), Universit\u00e9 Claude Bernard Lyon1, Universit\u00e9 de Lyon; Bd du 11 novembre 1918, B\u00e2t. Darwin C; 69622 Villeurbanne Cedex, France"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Veyrunes","family":"Fr\u00e9d\u00e9ric","sequence":"additional","affiliation":[{"name":"Institut des Sciences de l'Evolution de Montpellier (UMR CNRS 5554), Universit\u00e9 Montpellier, IRD, EPHE; 34095 Montpellier, France"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Renaud","family":"Sabrina","sequence":"additional","affiliation":[{"name":"Laboratoire de Biom\u00e9trie et Biologie Evolutive (UMR CNRS 5558), Universit\u00e9 Claude Bernard Lyon 1, Universit\u00e9 de Lyon; 69622 Villeurbanne Cedex, France"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Roussel","family":"Damien","sequence":"additional","affiliation":[{"name":"Laboratoire d'Ecologie des Hydrosyst\u00e8mes Naturels et Anthropis\u00e9s (UMR CNRS 5023), Universit\u00e9 Claude Bernard Lyon1, Universit\u00e9 de Lyon; Bd du 11 novembre 1918, B\u00e2t. 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