Abstract：
:Activity patterns are the product of interactions between an internal circadian clock and direct responses to photic and nonphotic features of the environment that are said to "mask" the influence of that clock. Evolutionary transitions between nocturnality and diurnality involve changes in mechanisms underlying both of these processes. Here, the authors examined how masking influences activity patterns of golden spiny mice ( Acomys russatus), which can be either nocturnal or diurnal, and common spiny mice (Acomys cahirinus), which are strictly nocturnal. Animals kept on a 12:12 LD cycle were exposed to 3-h dark pulses starting at ZT 2, light pulses of varying intensities (50, 100, 700, or 1500 lux) at ZT 14, and a 3.5:3.5-h LD cycle. In common spiny mice, activity increased by 379% during the dark pulse and decreased during light pulses to 23% of baseline levels. Golden spiny mice also increased their activity in response to the dark pulse (by 345%), but there was extreme inter-and intraindividual variability and no significant response to light pulses at night. In the 3.5:3.5 LD cycle, common spiny mice showed a preference for the dark phase with 86% +/- 0.01% of activity occurring then, whereas golden spiny mice showed a pronounced circadian rhythm but no evidence of masking. Masking responses to light and dark were thus unsurprising in common spiny mice but were highly unusual in golden spiny mice. Patterns seen in the latter species may reflect mechanisms enabling these animals to occupy either a diurnal or a nocturnal niche in their natural habitat.
journal_name
J Biol Rhythmsjournal_title
Journal of biological rhythmsauthors
Cohen R,Smale L,Kronfeld-Schor Ndoi
10.1177/0748730409351672subject
Has Abstractpub_date
2010-02-01 00:00:00pages
47-52issue
1eissn
0748-7304issn
1552-4531pii
25/1/47journal_volume
25pub_type
杂志文章abstract：:Circadian rhythms are programmed by the suprachiasmatic nucleus (SCN), which relies on neuropeptide signaling to maintain daily timekeeping. Vasoactive intestinal polypeptide (VIP) is critical for SCN function, but the precise role of VIP neurons in SCN circuits is not fully established. To interrogate their contribut...
journal_title：Journal of biological rhythms
pub_type： 杂志文章
doi：10.1177/0748730420925573
更新日期：2020-08-01 00:00:00
abstract：:Mice with targeted gene disruption have provided important information about the molecular mechanisms of circadian clock function. A full understanding of the roles of circadian-relevant genes requires manipulation of their expression in a tissue-specific manner, ideally including manipulation with high efficiency wit...
journal_title：Journal of biological rhythms
pub_type： 杂志文章
doi：10.1177/0748730418757006
更新日期：2018-04-01 00:00:00
abstract：:The mammalian circadian pacemaker is located in the suprachiasmatic nucleus (SCN). Various inputs modulate pacemaker phase, including the serotonergic (5HTergic) input from the midbrain raphe. 5HT phase-advances the SCN pacemaker when applied during mid subjective day. In vitro studies indicate that 5HT advances the m...
journal_title：Journal of biological rhythms
pub_type： 杂志文章
doi：10.1177/074873002129002429
更新日期：2002-04-01 00:00:00
abstract：:Subjective well-being largely depends on mood, which shows circadian rhythmicity and can be linked to rhythms in many physiological circadian markers, such as melatonin and cortisol. In healthy young volunteers mood is influenced by an interaction of circadian phase and the duration of time awake. The authors analyzed...
journal_title：Journal of biological rhythms
pub_type： 杂志文章
doi：10.1177/0748730409335546
更新日期：2009-06-01 00:00:00
abstract：:Previous research has demonstrated a clear link between late chronotype and depression. The vulnerability factors underpinning this link, however, are unclear. Here the relationship between two specific emotion regulation strategies, cognitive reappraisal and expressive suppression, and chronotype was investigated usi...
journal_title：Journal of biological rhythms
pub_type： 杂志文章
doi：10.1177/0748730417709111
更新日期：2017-08-01 00:00:00
abstract：:Whether the circatidal rhythm is generated by a machinery common to the circadian clock is one of the important and interesting questions in chronobiology. The mangrove cricket Apteronemobius asahinai shows a circatidal rhythm generating active and inactive phases and a circadian rhythm modifying the circatidal rhythm...
journal_title：Journal of biological rhythms
pub_type： 杂志文章
doi：10.1177/0748730413516309
更新日期：2014-02-01 00:00:00
abstract：:In mammals, molecular circadian rhythms are generated by autoregulatory transcriptional-translational feedback loops with PERIOD/CRYPTOCHROME containing complexes inhibiting the transcription of their own genes. Although the major circadian oscillator components seem to be identified, an increasing number of additiona...
journal_title：Journal of biological rhythms
pub_type： 杂志文章
doi：10.1177/0748730415587407
更新日期：2015-08-01 00:00:00
abstract：:Melatonin is secreted systemically from the pineal gland maximally at night but is also produced locally in many tissues. Its chronobiological function is mainly exerted by pineal melatonin. It is a feedback regulator of the main circadian pacemaker in the hypothalamic suprachiasmatic nuclei and of many peripheral osc...
journal_title：Journal of biological rhythms
pub_type： 杂志文章
doi：10.1177/0748730415616678
更新日期：2016-02-01 00:00:00
abstract：:Intertidal species have both circadian and circatidal clocks. Although the behavioral evidence for these oscillators is more than 5 decades old, virtually nothing is known about their molecular clockwork. Pigment-dispersing hormones (PDHs) were originally described in crustaceans. Their insect homologs, pigment-disper...
journal_title：Journal of biological rhythms
pub_type： 杂志文章
doi：10.1177/0748730411420242
更新日期：2011-12-01 00:00:00
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journal_title：Journal of biological rhythms
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更新日期：2005-04-01 00:00:00
abstract：:Rats anticipate a fixed daily feeding time by entrainment of a component of their multioscillatory circadian system. The range of stimuli capable of entraining this component is little studied. Previous studies suggest that restricted water access is not an effective entrainment stimulus, as measured by general locomo...
journal_title：Journal of biological rhythms
pub_type： 杂志文章
doi：10.1177/074873049200700206
更新日期：1992-07-01 00:00:00
abstract：:Numerous studies have demonstrated sleep-promoting effects of melatonin treatment in humans, as evidenced by subjects' self-reports, polysomnographic recordings, and continuous actigraphic registration of motor activity. The sleep-promoting effects of either physiological or pharmacological doses of melatonin typicall...
journal_title：Journal of biological rhythms
pub_type： 杂志文章,评审
doi：10.1177/074873049701200620
更新日期：1997-12-01 00:00:00
abstract：:Seasonal changes in numerous aspects of mammalian immune function arise as a result of the annual variation in environmental day length (photoperiod), but it is not known if absolute photoperiod or relative change in photoperiod drives these changes. This experiment tested the hypothesis that an individual's history o...
journal_title：Journal of biological rhythms
pub_type： 杂志文章
doi：10.1177/0748730409349714
更新日期：2009-12-01 00:00:00
abstract：:The authors analyzed the upstream regulatory region of purF, a gene that is expressed in a minority phase that peaks at dawn (class 2 circadian phasing) in Synechococcus elongatus, to determine whether specific cis elements are responsible for this characteristic expression pattern. Fusions of various promoter-bearing...
journal_title：Journal of biological rhythms
pub_type： 杂志文章
doi：10.1177/0748730403262056
更新日期：2004-04-01 00:00:00
abstract：:The authors have shown previously that vasopressin (VP) release from suprachiasmatic nucleus (SCN) efferents in rats is important for the timing of the circadian activity of the hypothalamo-pituitary-adrenal (HPA) axis, resulting in a circadian rise in corticosterone at dusk. When meals are supplied at a fixed time du...
journal_title：Journal of biological rhythms
pub_type： 杂志文章
doi：10.1177/074873098128999880
更新日期：1998-02-01 00:00:00
abstract：:Endogenous circadian rhythms are involved in various photoperiodic responses of birds. Investigations involving the mechanisms of photoperiodic time measurement in birds have been confined mainly to temperate zone species using males exclusively. Due to the paucity of experimental evidence on subtropical birds that ha...
journal_title：Journal of biological rhythms
pub_type： 杂志文章
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更新日期：1995-12-01 00:00:00
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journal_title：Journal of biological rhythms
pub_type： 杂志文章,评审
doi：10.1177/0748730415592729
更新日期：2015-10-01 00:00:00
abstract：:The large repertoire of circadian rhythms in diverse organisms depends on oscillating central clock genes, input pathways for entrainment, and output pathways for controlling rhythmic behaviors. Stress-activated p38 MAP Kinases (p38K), although sparsely investigated in this context, show circadian rhythmicity in mamma...
journal_title：Journal of biological rhythms
pub_type： 杂志文章
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更新日期：2014-12-01 00:00:00
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journal_title：Journal of biological rhythms
pub_type： 杂志文章
doi：10.1177/0748730410396678
更新日期：2011-04-01 00:00:00
abstract：:The circadian system in higher organisms temporally orchestrates rhythmic changes in a vast number of genes and gene products in different organs. Complex interactions between these components, both within and among cells, ultimately lead to rhythmic behavior and physiology. Identifying the plethora of circadian targe...
journal_title：Journal of biological rhythms
pub_type： 杂志文章
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更新日期：2006-12-01 00:00:00
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journal_title：Journal of biological rhythms
pub_type： 杂志文章,评审
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更新日期：2007-02-01 00:00:00
abstract：:The tau mutation in Syrian hamsters (Mesocricetus auratus) is phenotypically expressed in a period of the circadian rhythm of about 20 h in homozygotes (SS) and about 22 h in heterozygotes (S+). The authors investigate whether this well-defined model for variation in circadian period exhibits associated changes in ene...
journal_title：Journal of biological rhythms
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abstract：:Drosophila littoralis is a latitudinally widespread European species of the Drosophila virilis group. The species has ample genetic variation in photoperiodism (adult diapause) and circadian rhythmicity (pupal eclosion rhythm), with adaptive latitudinal clines in both of them. The possible common genetic basis between...
journal_title：Journal of biological rhythms
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更新日期：2006-02-01 00:00:00
abstract：:Life in the Arctic presents organisms with multiple challenges, including extreme photic conditions, cold temperatures, and annual loss and daily movement of sea ice. Polar bears (Ursus maritimus) evolved under these unique conditions, where they rely on ice to hunt their main prey, seals. However, very little is know...
journal_title：Journal of biological rhythms
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更新日期：2020-04-01 00:00:00
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pub_type： 信件
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更新日期：2011-10-01 00:00:00
abstract：:The aim of this study was to replicate and extend previous work in which the authors observed lower, shorter, and advanced nocturnal melatonin secretion patterns in premenstrually depressed patients compared to those in healthy control women. The authors also sought to test the hypothesis that the therapeutic effect o...
journal_title：Journal of biological rhythms
pub_type： 临床试验,杂志文章,随机对照试验
doi：10.1177/074873049701200107
更新日期：1997-02-01 00:00:00
abstract：:In isolated slices of hypothalamus, suprachiasmatic nucleus (SCN) neurons were recorded intracellularly. Blockade of Ca++ channels increased spike duration, eliminating an early component of the afterhyperpolarization (AHP) that followed evoked spikes. The duration and reversal potential of AHPs were, however, unaffec...
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abstract：:Obesity during pregnancy causes numerous maternal and fetal health complications, but the underlying mechanisms remain unclear. Adipose tissue dysfunction in obesity has previously been linked to disruption of the intrinsic adipose clock gene network that is crucial for normal metabolic function. This adipose clock al...
journal_title：Journal of biological rhythms
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更新日期：2018-06-01 00:00:00
abstract：:The temporal expression pattern of the circadian clock gene period was compared between heads of the linden bug, Pyrrhocoris apterus , kept under diapause-promoting short days (SD) and diapause-preventing long days (LD) using a real-time PCR quantification. Diapause or reproduction was programmed by photoperiod during...
journal_title：Journal of biological rhythms
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更新日期：2007-08-01 00:00:00
abstract：:The human circadian timing system has previously been shown to free run with a period slightly longer than 24 h in subjects living in the laboratory under conditions of forced desynchrony. In forced desynchrony, subjects are shielded from bright light and periodic time cues and are required to live on a day length out...
journal_title：Journal of biological rhythms
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更新日期：1999-06-01 00:00:00
