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The Genetics of Mammalian Circadian Order and Disorder: Implications for Physiology and Disease

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TLDR
Together, these studies set the scene for applying the knowledge of circadian biology to the understanding and treatment of a range of human diseases, including cancer and metabolic and behavioural disorders.
Abstract
Circadian cycles affect a variety of physiological processes, and disruptions of normal circadian biology therefore have the potential to influence a range of disease-related pathways. The genetic basis of circadian rhythms is well studied in model organisms and, more recently, studies of the genetic basis of circadian disorders has confirmed the conservation of key players in circadian biology from invertebrates to humans. In addition, important advances have been made in understanding how these molecules influence physiological functions in tissues throughout the body. Together, these studies set the scene for applying our knowledge of circadian biology to the understanding and treatment of a range of human diseases, including cancer and metabolic and behavioural disorders.

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Functional analysis of Casein Kinase 1 in a minimal circadian system

TL;DR: Modulation of CK1 function lengthens circadian rhythms in Ostreococcus tauri, a unicellular marine algal species at the base of the green lineage, separated from humans by ~1.5 billion years of evolution.
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Alterations of circadian clockworks during differentiation and apoptosis of rat ovarian cells

TL;DR: The results strongly suggest the circadian clockwork alters in ovarian cells during follicular development, luteinization, and apoptosis, and expression of Bmal1 may be related to the switch-on and switch-off of the circadian oscillation.
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Circadian oscillator proteins across the kingdoms of life: structural aspects

TL;DR: This review covers the structural aspects of circadian oscillators, and serves as a primer for this exciting realm of structural biology.
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PER2 Variation is Associated with Diurnal Preference in a Korean Young Population

TL;DR: Genotype and allele carrier status of a PER2 G3853A polymorphism (rs934945) were associated with CSM scores, indicating that rs9 34945 of PER2 may be associated with diurnal preference in a Korean healthy population.
References
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Journal Article

A self-assessment questionnaire to determine morningness-eveningness in human circadian rhythms.

TL;DR: Although the questionnaire appears to be valid, further evaluation using a wider subject population is required, as sleep habits are an important déterminant of peak time there are other contibutory factors, and these appear to be partly covered by the questionnaire.
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The role of actigraphy in the study of sleep and circadian rhythms.

TL;DR: It is suggested that in the clinical setting, actigraphy is reliable for evaluating sleep patterns in patients with insomnia, for studying the effect of treatments designed to improve sleep, in the diagnosis of circadian rhythm disorders (including shift work), and in evaluating sleep in individuals who are less likely to tolerate PSG, such as infants and demented elderly.
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Hypothalamic regulation of sleep and circadian rhythms

TL;DR: These findings explain how various drugs affect sleep and wakefulness, and provide the basis for a wide range of environmental influences to shape wake–sleep cycles into the optimal pattern for survival.
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Obesity and Metabolic Syndrome in Circadian Clock Mutant Mice

TL;DR: Estimation of transcripts encoding selected hypothalamic peptides associated with energy balance was attenuated in the Clock mutant mice, suggesting that the circadian clock gene network plays an important role in mammalian energy balance.
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Coordinated transcription of key pathways in the mouse by the circadian clock.

TL;DR: Genetic and genomic analysis suggests that a relatively small number of output genes are directly regulated by core oscillator components, and major processes regulated by the SCN and liver were found to be under circadian regulation.
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