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SignificanceWhile increasing evidence associates the disruption of circadian rhythms with pathologic conditions, including obesity, type 2 diabetes, and nonalcoholic fatty liver diseases (NAFLD), the involved mechanisms are still poorly described. Here, we show that, in both humans and mice, the pathogenesis of NAFLD is associated with the disruption of the circadian clock combined with perturbations of the growth hormone and sex hormone pathways. However, while this condition protects mice from the development of fibrosis and insulin resistance, it correlates with increased fibrosis in humans. This suggests that the perturbation of the circadian clock and its associated disruption of the growth hormone and sex hormone pathways are critical for the pathogenesis of metabolic and liver diseases.
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http://dx.doi.org/10.1073/pnas.2200083119 | DOI Listing |
Elife
September 2025
Department of Psychiatry & Biobehavioral Sciences, University of California, Los Angeles, Los Angeles, United States.
Fragile X syndrome (FXS), a leading inherited cause of intellectual disability and autism, is frequently accompanied by sleep and circadian rhythm disturbances. In this study, we comprehensively characterized these disruptions and evaluated the therapeutic potential of a circadian-based intervention in the fragile X mental retardation 1 () knockout (KO) mouse. The KO mice exhibited fragmented sleep, impaired locomotor rhythmicity, and attenuated behavioral responses to light, linked to an abnormal retinal innervation and reduction of light-evoked neuronal activation in the suprachiasmatic nucleus.
View Article and Find Full Text PDFChronobiol Int
September 2025
Department of Zoology, The Maharaja Sayajirao University of Baroda, Vadodara, Gujarat, India.
Lung cancer remains one of the most fatal cancers, with cigarette smoke (CS) exposure being a major risk factor due to its role in triggering oxidative stress. Disruption of circadian rhythms, increasingly common in modern lifestyles, has also been linked to cancer progression. Targeting both oxidative imbalance and circadian disruption may offer a more effective therapeutic approach.
View Article and Find Full Text PDFZygote
September 2025
International School of Medicine, Istanbul Medipol University, Istanbul, Turkey.
Circadian rhythms are intrinsic, endogenously generated cycles that regulate various physiological processes, including reproductive functions. These rhythms are orchestrated by a network of core clock genes and are influenced by external environmental cues, primarily the light-dark cycle. Disruptions in circadian rhythms can have profound effects on fertility in both males and females, impacting processes such as the estrous cycle, ovulation, sperm production, implantation and pregnancy maintenance.
View Article and Find Full Text PDFPLoS One
September 2025
Department of Biological Sciences, University of Limerick, Limerick, Ireland.
This study investigates the interaction between circadian rhythms and lipid metabolism disruptions in the context of obesity. Obesity is known to interfere with daily rhythmicity, a crucial process for maintaining brain homeostasis. To better understand this relationship, we analyzed transcriptional data from mice fed with normal or high-fat diet, focusing on the mechanisms linking genes involved with those regulating circadian rhythms.
View Article and Find Full Text PDFSleep Adv
August 2025
Division of Public Health, Department of Family and Preventive Medicine, University of Utah, 303 Chipeta Way, Salt Lake City, UT 84013, United States of America.
Individuals with mild cognitive impairment (MCI) demonstrate cognitive decline without major functional impairment and are at increased risk for developing Alzheimer's disease and related dementias (ADRD). Sleep and biobehavioral rhythm disturbances (disruptions in 24-h oscillations in physiology and behavior, including rest-activity patterns and mealtimes) are more than twice as common among patients with MCI than cognitively intact older adults. Importantly, the consequences of sleep and biobehavioral rhythm disruption in MCI extend beyond the patient, also profoundly affecting the spouse/partner.
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