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However, relatively little is known about circadian function in disease states, such as epilepsy. This study aimed to characterize brain and peripheral core circadian clock gene expression in rat models of genetic and acquired epilepsy.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>For the Genetic Absence Epilepsy Rats from Strasbourg (GAERS) study, we used 40 GAERS and 40 non\u2010epileptic control (NEC) rats. For the kainic acid status epilepticus (KASE) study, we used 40 KASE and 40 sham rats. Rats were housed in a 7\u2009<jats:sc>am<\/jats:sc>:7\u2009<jats:sc>pm<\/jats:sc> light\u2013dark cycle. Hypothalamus, hippocampus, liver, and small intestine samples were collected every 3\u2009h throughout the light period. We then assessed core diurnal clock gene expression of <jats:italic>per1<\/jats:italic>, <jats:italic>cry1<\/jats:italic>, <jats:italic>clock<\/jats:italic>, and <jats:italic>bmal1<\/jats:italic>.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>In the GAERS rats, all tissues exhibited significant changes in clock gene expression (<jats:italic>P<\/jats:italic>\u2009&lt;\u20090.05) when compared to NEC. In the KASE rats, there were fewer effects of the epileptic condition in the hypothalamus, hippocampus, or small intestine (<jats:italic>P<\/jats:italic>\u2009&gt;\u20090.05) compared with shams.<\/jats:p><\/jats:sec><jats:sec><jats:title>Significance<\/jats:title><jats:p>These results indicate marked diurnal disruption to core circadian clock gene expression in rats with both generalized and focal chronic epilepsy. This could contribute to epileptic symptomology and implicate the circadian system as a viable target for future treatments.<\/jats:p><\/jats:sec>","DOI":"10.1002\/epi4.12841","type":"journal-article","created":{"date-parts":[[2023,10,9]],"date-time":"2023-10-09T12:57:55Z","timestamp":1696856275000},"page":"1523-1531","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["Diurnal circadian clock gene expression is altered in models of genetic and acquired epilepsy"],"prefix":"10.1002","volume":"8","author":[{"given":"Glenn R.","family":"Yamakawa","sequence":"first","affiliation":[{"name":"Department of Neuroscience, Central Clinical School Monash University  Melbourne Victoria Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Meshwa","family":"Patel","sequence":"additional","affiliation":[{"name":"Department of Neuroscience, Central Clinical School Monash University  Melbourne Victoria 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