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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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Journal ArticleDOI

Circadian rhythms influence hematopoietic stem cells

TL;DR: HSC traffic and hematopoiesis do not escape the circadian regulation that controls most physiological processes and the timing of stem cell harvest or infusion may impact the yield or engraftment, respectively and may result in better therapeutic outcomes.
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Circadian rhythms and cancer.

TL;DR: The emerging role of circadian genes in hematological and hormone-related malignances is discussed and new insights suggest that manipulating circadian biology as a way to fight cancer, as well as, other life threatening diseases is within the realm of possibility.
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Circadian and sleep disorder in Huntington's disease.

TL;DR: A better understanding of the relationship between sleep/circadian abnormalities and HD pathology is needed, if treatment of this aspect of HD is to be optimized.
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Interactions of the serotonin and circadian systems: nature and nurture in rhythms and blues.

TL;DR: The neuroanatomical and genetic basis for serotonin-circadian interactions in the brain, their potential relationship with neurobehavioral disorders, and recent work examining the effects on the circadian system of genetic perturbation of the serotonergic system are reviewed.
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Melanopsin and the Intrinsically Photosensitive Retinal Ganglion Cells: Biophysics to Behavior.

TL;DR: The study of ipRGCs has yielded insight into general topics that include photoreceptor evolution, cellular diversity, and the steps from biophysical mechanisms to behavior.
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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