1 Introduction
Virtually all organisms studied to date, from bacteria to humans, possess an internal clock that has an intrinsic period of approximately 24 h. This endogenous pacemaker drives circadian rhythms (“circa” = about, “dies” = a day) of myriad biological processes, from cell metabolism to behavioral state. Although the anatomical location and genetic components of the pacemaker differ among species, all circadian systems can be described by a three-component model that includes: (1) the pacemaker, a molecular clock that has a period of approximately 24 h and that continues to oscillate even in the prolonged absence of any timing cues, (2) an input pathway that conveys environmental time cues to the pacemaker, and (3) output pathways by which the pacemaker can influence biochemistry and behavior (Takahashi et al., 2001). This review focuses on mammalian circadian rhythms, and covers the anatomical and molecular basis for the master pacemaker, the neurochemical processes...
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Abbreviations
- ANS:
-
Autonomic nervous system
- CT:
-
circadian time
- CRE:
-
cyclic-AMP response element
- CREB:
-
CRE-binding protein
- FSH:
-
follicle stimulating hormone
- GRP:
-
gastrin-related peptide
- GnRH:
-
gonadotropin-releasing hormone
- G-protein:
-
guanine nucleotide binding protein
- HPA:
-
hypothalamic-pituitary-adrenal
- HPG:
-
hypothalamic-pituitary-gonadal
- IGL:
-
intergeniculate leaflet
- LD:
-
light:dark
- LH:
-
luteinizing hormone
- MEF:
-
mouse embryonic fibroblast
- MUA:
-
multiunit electrical activity
- NPY:
-
neuropeptide Y
- PACAP:
-
pituitary adenylate cyclase activating polypeptide
- POA:
-
preoptic area
- RGC:
-
retinal ganglion cell
- RHT:
-
retinohypothalamic tract
- RORE:
-
retinoic acid related orphan receptor response element
- 5-HT:
-
serotonin
- SCN:
-
suprachiasmatic nucleus
- VIP:
-
vasoactive intestinal peptide
- AVP:
-
vasopressin
- TTX:
-
tetrodotoxin
- ZT:
-
Zeitgeber time
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Miller, B.H., McDearmon, E.L., Takahashi, J.S. (2007). The Mammalian Circadian System: from Genes to Behavior. In: Lajtha, A., Blaustein, J.D. (eds) Handbook of Neurochemistry and Molecular Neurobiology. Springer, New York, NY. https://doi.org/10.1007/978-0-387-30405-2_22
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