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The biological clock is involved in many aspects of regulating complex physiology in all animals. It was in 1935 when German zoologists, Hans Kalmus and Erwin Bünning, discovered the existence of circadian rhythm in Drosophila melanogaster. However, the internal molecular mechanisms behind the circadian clock remained a mystery until 1984, when Jeffrey C. Hall, Michael Rosbash, and Michael W. Young discovered the expression of the Per gene oscillating over a 24-hour cycle. In subsequent years,...
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Mammalian clock output mechanisms.

Andries Kalsbeek1, Chun-Xia Yi, Cathy Cailotto

  • 1Division of Gastroenterology and Hepatology, Academic Medical Center (AMC), AZ, Amsterdam, The Netherlands. a.kalsbeek@amc.uva.nl

Essays in Biochemistry
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Summary
This summary is machine-generated.

Mammalian biological clocks regulate daily rhythms in behavior, physiology, and hormones. The hypothalamus coordinates these rhythms via specialized anatomical connections to neuroendocrine and autonomic systems.

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Area of Science:

  • Chronobiology
  • Neuroendocrinology
  • Physiology

Background:

  • Mammalian daily rhythms in behavior, physiology, and endocrine functions are controlled by a timing system of central and peripheral clocks.
  • The hypothalamic biological clock plays a crucial role in orchestrating these rhythms, influencing sleep-wake cycles, feeding patterns, hormone release, and energy metabolism.

Purpose of the Study:

  • To present the anatomical connections utilized by the mammalian biological clock to regulate bodily functions.
  • To review physiological experiments that explore the functional significance of these neuro-anatomical pathways.

Main Methods:

  • Anatomical tracing of connections from the hypothalamic biological clock.
  • Review of physiological experiments investigating the functional roles of these connections.

Main Results:

  • The hypothalamic biological clock exerts direct control over neuroendocrine and energy homeostasis systems.
  • A highly specialized organization of connections exists between the hypothalamic pacemaker and the neuro-endocrine system.
  • Connections to the pre-sympathetic and pre-parasympathetic branches of the autonomic nervous system are also highlighted.

Conclusions:

  • The mammalian biological clock utilizes a specialized neuro-anatomical network to enforce endogenous rhythmicity throughout the body.
  • This network is critical for coordinating daily rhythms in behavior, physiology, and endocrine functions, particularly impacting energy metabolism and autonomic control.