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Related Concept Videos

Circadian Rhythms and Gene Regulation02:19

Circadian Rhythms and Gene Regulation

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,...
Circadian Rhythms and Gene Regulation02:19

Circadian Rhythms and Gene Regulation

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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Relaxin-3 null mutation mice display a circadian hypoactivity phenotype.

C M Smith1, I T Hosken, S W Sutton

  • 1Howard Florey Institute, Florey Neuroscience Institutes, The University of Melbourne, Melbourne, VIC 3010, Australia.

Genes, Brain, and Behavior
|September 9, 2011
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Relaxin-3 knockout mice show reduced activity during their active phase, suggesting relaxin-3 signaling is crucial for regulating arousal and sleep-wake cycles. This finding offers a new model for studying these essential biological processes.

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Area of Science:

  • Neuroscience
  • Behavioral Neuroscience
  • Sleep Research

Background:

  • Understanding arousal and circadian rhythms is key to neuroscience and mental health research, particularly for conditions like depression.
  • Relaxin-3 neurons and their projections are implicated in regulating cortical, limbic, and hypothalamic circuits involved in arousal and sleep.
  • Investigating the role of relaxin-3 in behavior provides insights into neural control mechanisms.

Purpose of the Study:

  • To characterize the behavioral phenotype of relaxin-3 knockout (KO) mice.
  • To assess the impact of relaxin-3 deficiency on sensorimotor function, complex behaviors, and circadian activity patterns.
  • To determine if relaxin-3 plays a role in arousal and sleep/wake regulation.

Main Methods:

  • Generated and utilized C57BL/6J backcrossed relaxin-3 KO mice and wild-type (WT) littermates.
  • Administered a comprehensive battery of behavioral tests to evaluate motor coordination, memory, anxiety, and locomotor activity.
  • Assessed circadian activity using voluntary running wheels during the active phase (dark cycle).

Main Results:

  • No significant deficits were observed in motor coordination, spatial memory, sensorimotor gating, anxiety-like behavior, or novel environment locomotion.
  • Relaxin-3 KO mice exhibited significant hypoactivity during the dark/active phase when provided with running wheels.
  • KO mice showed reduced running wheel time and distance, alongside increased immobility, suggesting potential increases in sleep.

Conclusions:

  • Relaxin-3 signaling is implicated in the control of arousal and sleep/wakefulness.
  • Relaxin-3 KO mice display a specific circadian hypoactivity phenotype, supporting its role in regulating active behaviors during the typical active period.
  • The relaxin-3 KO mouse serves as a valuable model for further investigation into the neurobiology of arousal and sleep regulation.