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Mice Lacking EGR1 Have Impaired Clock Gene (BMAL1) Oscillation, Locomotor Activity, and Body Temperature

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Abstract

Early growth response transcription factor 1 (EGR1) is expressed in the suprachiasmatic nucleus (SCN) after light stimulation. We used EGR1-deficient mice to address the role of EGR1 in the clock function and light-induced resetting of the clock. The diurnal rhythms of expression of the clock genes BMAL1 and PER1 in the SCN were evaluated by semi-quantitative in situ hybridization. We found no difference in the expression of PER1 mRNA between wildtype and EGR1–deficient mice; however, the daily rhythm of BMAL1 mRNA was completely abolished in the EGR1–deficient mice. In addition, we evaluated the circadian running wheel activity, telemetric locomotor activity, and core body temperature of the mice. Loss of EGR1 neither altered light-induced phase shifts at subjective night nor affected negative masking. Overall, circadian light entrainment was found in EGR1-deficient mice but they displayed a reduced locomotor activity and an altered temperature regulation compared to wild type mice. When placed in running wheels, a subpopulation of EGR1-deficient mice displayed a more disrupted activity rhythm with no measurable endogenous period length (tau). In conclusion, the present study provides the first evidence that the circadian clock in the SCN is disturbed in mice deficient of EGR1.

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Acknowledgements

The skillful technical assistance of Anita Hansen and Tina Wintersø is gratefully acknowledged. The study was supported by the Danish Biotechnology Center for Cellular Communication.

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Authors and Affiliations

  1. Department of Clinical Biochemistry, Bispebjerg and Frederiksberg Hospital, Faculty of Health Sciences, University of Copenhagen, Copenhagen, NV, Denmark

    Casper Schwartz Riedel, Birgitte Georg, Henrik L. Jørgensen, Jens Hannibal & Jan Fahrenkrug

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  1. Casper Schwartz Riedel
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  2. Birgitte Georg
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  3. Henrik L. Jørgensen
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  4. Jens Hannibal
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  5. Jan Fahrenkrug
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Correspondence to Casper Schwartz Riedel.

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Riedel, C.S., Georg, B., Jørgensen, H.L. et al. Mice Lacking EGR1 Have Impaired Clock Gene (BMAL1) Oscillation, Locomotor Activity, and Body Temperature. J Mol Neurosci 64, 9–19 (2018). https://doi.org/10.1007/s12031-017-0996-8

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  • DOI: https://doi.org/10.1007/s12031-017-0996-8

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