An Evolutionary Fitness Enhancement Conferred by the Circadian System in Cyanobacteria.
An Evolutionary Fitness Enhancement Conferred by the Circadian System in Cyanobacteria.
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DOI：
10.1016/j.chaos.2012.11.006
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发表时间：
2013-05-01
期刊：
影响因子：
--
通讯作者：
Johnson CH
中科院分区：
文献类型：
--
作者：
Ma P;Woelfle MA;Johnson CH
生物钟存在于从蓝藻到哺乳动物的各种生物体中。许多人认为，生物钟系统的进化是为了适应地球自转驱动的光和温度的日常周期。对蓝细菌Synechococcus elongatus PCC 7942的研究已经证实，与环境周期共振的生物钟赋予具有不同时钟特性的蓝细菌菌株在光暗周期下竞争生长时的适应性优势。迄今为止的结果表明，在循环环境中，自由运行期最接近环境周期的蓝藻菌株是最合适的，而缺乏功能性昼夜节律钟的菌株相对于具有功能性生物钟的菌株处于竞争劣势。相比之下，昼夜节律系统提供很少或没有优势，蓝藻生长在竞争中不断的光。为了解释这种生物钟介导的蓝藻适应性增强的潜在机制，已经提出了几种模型，这些模型包括有限资源模型，扩散抑制剂模型和细胞间通信模型。这些模型都没有被排除在目前可用的实验数据和时钟介导的健身增强的机制基础仍然难以捉摸。
Circadian clocks are found in a wide variety of organisms from cyanobacteria to mammals. Many believe that the circadian clock system evolved as an adaption to the daily cycles in light and temperature driven by the rotation of the earth. Studies on the cyanobacterium, Synechococcus elongatus PCC 7942, have confirmed that the circadian clock in resonance with environmental cycles confers an adaptive advantage to cyanobacterial strains with different clock properties when grown in competition under light-dark cycles. The results thus far suggest that in a cyclic environment, the cyanobacterial strains whose free running periods are closest to the environmental period are the most fit and the strains lacking a functional circadian clock are at a competitive disadvantage relative to strains with a functional clock. In contrast, the circadian system provides little or no advantage to cyanobacteria grown in competition in constant light. To explain the potential mechanism of this clock-mediated enhancement in fitness in cyanobacteria, several models have been proposed; these include the limiting resource model, the diffusible inhibitor model and the cell-to-cell communication model. None of these models have been excluded by the currently available experimental data and the mechanistic basis of clock-mediated fitness enhancement remains elusive.
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DOI：
10.1007/s003590050017
发表时间：
2000-02-01
期刊：
JOURNAL OF COMPARATIVE PHYSIOLOGY A-SENSORY NEURAL AND BEHAVIORAL PHYSIOLOGY
影响因子：
--
作者：
DeCoursey, PJ;Walker, JK;Smith, SA
通讯作者：
Smith, SA
影响因子：
7.4
作者：
Green, RM;Tingay, S;Tobin, EM
通讯作者：
Tobin, EM
影响因子：
10.5
作者：
Rutherford, Steven T.;van Kessel, Julia C.;Bassler, Bonnie L.
通讯作者：
Bassler, Bonnie L.
影响因子：
2
作者：
Gonze, D;Roussel, MR;Goldbeter, A
通讯作者：
Goldbeter, A
影响因子：
2.7
作者：
Zaccaro, María Cristina;Kato, Adriana;Stella, Ana María
通讯作者：
Stella, Ana María