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This transient [Ca<jats:sup>2+<\/jats:sup>]<jats:sub>mito<\/jats:sub> increase may be important in the resynthesis of ATP and other processes. The resynthesis of ATP in the mitochondria generates heat that can lead to hypermetabolic reactions in muscle with ryanodine receptor 1 (RyR1) variants during the cyclic releasing of SR Ca<jats:sup>2+<\/jats:sup> in the presence of a RyR1 agonist. We aimed to analyse whether the mitochondria of <jats:italic>RYR1<\/jats:italic> variant muscle handles Ca<jats:sup>2+<\/jats:sup> differently from healthy muscle.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>We used confocal microscopy to track mitochondrial and cytoplasmic Ca<jats:sup>2+<\/jats:sup> with fluorescent dyes simultaneously during caffeine\u2010induced Ca<jats:sup>2+<\/jats:sup> waves in <jats:italic>extensor digitorum longus<\/jats:italic> muscle fibres from healthy mice and mice heterozygous (HET) for a malignant hyperthermia\u2010causative <jats:italic>RYR1<\/jats:italic> variant.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Mitochondrial Ca<jats:sup>2+<\/jats:sup>\u2010transient peaks trailed the peak of cytoplasmic Ca<jats:sup>2+<\/jats:sup> transients by many seconds with [Ca<jats:sup>2+<\/jats:sup>]<jats:sub>mito<\/jats:sub> not increasing by more than 250\u2009nM. A strong linear relationship between cytoplasmic Ca<jats:sup>2+<\/jats:sup> and [Ca<jats:sup>2+<\/jats:sup>]<jats:sub>mito<\/jats:sub> amplitudes was observed in HET <jats:italic>RYR1<\/jats:italic> KI fibres but not wild type (WT).<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>Our results indicate that [Ca<jats:sup>2+<\/jats:sup>]<jats:sub>mito<\/jats:sub> change within the nM range during SR Ca<jats:sup>2+<\/jats:sup> release. HET fibre mitochondria are more sensitive to SR Ca<jats:sup>2+<\/jats:sup> release flux than WT. This may indicate post\u2010translation modification differences of the mitochondrial Ca<jats:sup>2+<\/jats:sup> uniporter between the genotypes.<\/jats:p><\/jats:sec>","DOI":"10.1111\/apha.14098","type":"journal-article","created":{"date-parts":[[2024,1,19]],"date-time":"2024-01-19T13:15:19Z","timestamp":1705670119000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Muscle fibre mitochondrial [Ca<sup>2+<\/sup>] dynamics during Ca<sup>2+<\/sup> waves in <i>RYR1<\/i> gain\u2010of\u2010function mouse"],"prefix":"10.1111","volume":"240","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-9673-3986","authenticated-orcid":false,"given":"Rhayanna B.","family":"Gaglianone","sequence":"first","affiliation":[{"name":"School of Biomedical Sciences The University of Queensland  Brisbane Queensland 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