1997
DOI: 10.3109/07420529709001470
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Temperature Compensation of the Orcadian Period Lenth-a Special Case Among General Homeostatic Mechanisms of Gene Expression?

Abstract: In Neurospora crassa, as well as in other organisms, the expression of housekeeping genes is transiently suppressed after exposure to higher temperatures (30-45 degrees C); expression is then reactivated and adapts after a few-hours to values closer to the initial rates. Adaptive mechanisms apparently exist in the processes of transcription, RNA processing, and translation and render protein synthesis rates temperature compensated. Heat shock proteins (HSPs) play an important role within these mechanisms ("acq… Show more

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Cited by 19 publications
(16 citation statements)
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“…If sufficient numbers of individuals are available, assessments like ours may support the idea that testing at various times of the day will not increase the variance of the results. However, this trend is unlikely to be general because circadian clocks play a role in the expression of heat shock proteins [76] and because daily rhythms are a factor in the critical temperatures of other species, for example Rana clamitans [50]. If cyclic components of critical temperatures are more important in some models than in others, the only options are to make preliminary tests that verify this possibility or to take a conservative approach that aims to use measures according to ecologically relevant criteria, e.g., the time of day at which the maximum exposure to warm temperatures is likely to occur.…”
Section: Discussionmentioning
confidence: 99%
“…If sufficient numbers of individuals are available, assessments like ours may support the idea that testing at various times of the day will not increase the variance of the results. However, this trend is unlikely to be general because circadian clocks play a role in the expression of heat shock proteins [76] and because daily rhythms are a factor in the critical temperatures of other species, for example Rana clamitans [50]. If cyclic components of critical temperatures are more important in some models than in others, the only options are to make preliminary tests that verify this possibility or to take a conservative approach that aims to use measures according to ecologically relevant criteria, e.g., the time of day at which the maximum exposure to warm temperatures is likely to occur.…”
Section: Discussionmentioning
confidence: 99%
“…It may also be advantageous with respect to seasonal changes of temperature and adaptation of species to different climates. Furthermore, a particular feature of circadian rhythms, the temperature compensation of its period length, may rely on several adaptive mechanisms, including homeostasis of protein turnover (Rensing et al, 1997).…”
Section: Discussionmentioning
confidence: 99%
“…This acquired thermotolerance is one of the important adaptive responses to changes in the ambient temperature and contributes to the cell's homeostasis under different conditions. Acquired translational thermotolerance may also be effective in the ''temperature compensation'' of the circadian period length (Rensing et al, 1995(Rensing et al, , 1997.…”
Section: Academic Pressmentioning
confidence: 99%
“…Examples of these clocks include the millisecond clock observed during the courtship of Drosophila (19), the 40-s defecation clock (fast clock) found in nematodes (10), and the ultradian clock (period Ϸ 1 h) found in Acanthamoeba castellanii (21) and in Paramecium tetraurelia (15). Biological clocks can be differentiated from biological oscillators and rhythms by two properties: they must run continuously under constant conditions and have temperature compensation (6,20,24) The effects of temperature on the frequencies of biological oscillations have been extensively studied (25,32). The periods of glycolytic oscillators (4) and cell cycle oscillators (1) are temperature dependent, and the oscillation periods are usually halved when there is a 10°C increase in temperature; i.e., the temperature quotient (Q 10 ) is ϳ2.…”
mentioning
confidence: 99%