Inter-individual variations in circadian misalignment-induced NAFLD pathophysiology in mice

Area of Science:

• Chronobiology
• Metabolic Disease Research
• Animal Models

Background:

• Circadian misalignment, often due to shift work, causes varied health issues.
• Understanding individual differences in disease susceptibility is crucial for personalized prevention.
• Mechanisms underlying these variations in response to circadian disruption remain unclear.

Purpose of the Study:

• To investigate inter-individual differences in pre-symptomatic pathological progression following chronic jet-lag (CJL).
• To identify mechanistic links between circadian rhythm robustness and disease development.
• To explore potential predictive biomarkers for circadian rhythm disorders.

Main Methods:

• Utilized an integrative approach combining physiological, transcriptional, and histological phenotypes in wild-type mice.
• Exposed mice to chronic jet-lag (CJL) to model circadian misalignment.
• Analyzed hepatic transcriptomic signatures and histopathological changes, correlating them with behavioral rhythm characteristics.

Main Results:

• CJL significantly increased hepatic steatosis prevalence with marked inter-individual variability.
• Transcriptomic analysis revealed dysregulation of lipid metabolism pathways in affected mice.
• The robustness (period and power) of intrinsic behavioral rhythms correlated with CJL-induced gene expression patterns.

Conclusions:

• Circadian rhythm robustness influences individual susceptibility to diseases caused by circadian misalignment.
• Dysregulation of lipid metabolism is a key factor in CJL-induced liver pathology.
• Rhythm characteristics may serve as predictive indicators for circadian rhythm disorders and related diseases.