Virtually all eukaryotic organisms appropriately examined have been shown to possess the capacity for endogenous temporal control and organization known as a circadian rhythm. The cellular machinery responsible for generating rhythms is collectively known as the biological clock. A healthy circadian clock underlies both physical and mental health. Because of the ubiquity of its influence on human mental and physiological processes - from circadian changes in basic human physiology to the clear involvement of rhythms in work/rest cycles and sleep - understanding the clock is basic to prevention and treatment of many physical and mental illnesses, from metabolic disorders to sleep/wake dysfunction and cancer.
Our specific aims are designed to further our understanding of the means through which this clock that regulates cell behavior is organized.
Specific Aim #1 builds upon our understanding of the interplay between structure and function in core clock components. New data are inconsistent with some existing models and predicted roles for clock proteins. We will identify updated roles, interactions, and structures, as well as probing how time-of-day-specific clock-controlled phosphorylation guides essential interactions and activities of clock components.
Specific Aim#2 re-examines the overarching regulatory architecture of the eukaryotic circadian oscillator in light of new data that challenge a major precept of current theory, the essential role of protein turnover. This also prompts a closer look at the role of phosphorylation in temperature compensation and the kinases that bring this about.
Specific Aim #3 builds upon our strong grounding in genetics and genomics as well as ongoing work that has identified previously unstudied genes whose mutation alters period length by as much 18 hours. Examination of the bases of these effects will take us into aspects metabolism and gene expression heretofore unexplored in terms of circadian biology. Our long term goals are to describe, in the language of genetics and biochemistry, the feedback cycle comprising the circadian clock, how this cycle is synchronized with the environment, and how time information generated by the feedback cycle is used to regulate the behavior of cells and organisms. These projects are complementary and mutually enriching in that they rely on genetic and molecular techniques to dissect, and ultimately to understand, the organization of cells as a function of time.
Biological clocks work in all cells of the human body to regulate metabolism. By studying cells of mice and humans, as well as cells of a fungus, we can understand how clock control works, how jet lag happens, and how clock malfunction leads to diseases like diabetes and mental illness.
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|Wang, Bin; Zhou, Xiaoying; Loros, Jennifer J et al. (2016) Alternative Use of DNA Binding Domains by the Neurospora White Collar Complex Dictates Circadian Regulation and Light Responses. Mol Cell Biol 36:781-93|
|Wang, Zheng; Li, Ning; Li, Jigang et al. (2016) The Fast-Evolving phy-2 Gene Modulates Sexual Development in Response to Light in the Model Fungus Neurospora crassa. MBio 7:e02148|
|Olivares-YaÃ±ez, Consuelo; Emerson, Jillian; Kettenbach, Arminja et al. (2016) Modulation of Circadian Gene Expression and Metabolic Compensation by the RCO-1 Corepressor of Neurospora crassa. Genetics 204:163-76|
|Hurley, Jennifer M; Loros, Jennifer J; Dunlap, Jay C (2016) The circadian system as an organizer of metabolism. Fungal Genet Biol 90:39-43|
|Hurley, Jennifer; Loros, Jennifer J; Dunlap, Jay C (2015) Dissecting the mechanisms of the clock in Neurospora. Methods Enzymol 551:29-52|
|Oliveira, Anderson G; Stevani, Cassius V; Waldenmaier, Hans E et al. (2015) Circadian control sheds light on fungal bioluminescence. Curr Biol 25:964-8|
|Emerson, Jillian M; Bartholomai, Bradley M; Ringelberg, Carol S et al. (2015) period-1 encodes an ATP-dependent RNA helicase that influences nutritional compensation of the Neurospora circadian clock. Proc Natl Acad Sci U S A 112:15707-12|
|Fuller, Kevin K; Loros, Jennifer J; Dunlap, Jay C (2015) Fungal photobiology: visible light as a signal for stress, space and time. Curr Genet 61:275-88|
|Hurley, Jennifer H; Dasgupta, Arko; Andrews, Peter et al. (2015) A Tool Set for the Genome-Wide Analysis of Neurospora crassa by RT-PCR. G3 (Bethesda) 5:2043-9|
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