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Background: Circadian clocks are self-sustaining oscillators that coordinate behavior and physiology over a 24 hour peri- od, achieving time-dependent homeostasis with the external environment. The molecular clocks driving circadian rhythmic changes are based on intertwined transcriptional/translational feedback loops that combine with a range of environmental and metabolic stimuli to generate daily internal programing. Understanding how biological rhythms are generated through- out the body and the reasons for their dysregulation can provide avenues for temporally directed therapeutics. Summary: In recent years, microRNAs have been shown to play important roles in the regulation of the circadian clock, particularly in Drosophila, but also in some small animal and human studies. This review will summarize our current un- derstanding of the role of miRNAs during clock regulation, with a particular focus on the control of clock regulated gene expression. Keywords: MicroRNAs; biological clock; circadian rhythm.

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Objective. To compare the treatment efficacy of Kuntai capsule with Climen only in the therapy of premature ovarian failure. Methods. Randomized controlled trials were electronically retrieved from PubMed, Cochrane Library, Web of science, CBM, CNKI, Wanfang, and Weipu database. In addition, some related papers were manually checked. All papers were assessed according to the Cochrane Handbook for Systematic Reviews of Interventions, and the effective data were analyzed by Revman 5.3 Software. Results. 11 randomized control trials involving 1068 patients were included. Results of meta-analysis showed that E2 (estrogen), the total therapeutic effective rate of the group of Kuntai capsule, and hormone were higher than hormone only. The LH (luteinizing hormone), FSH (follicle-stimulating hormone), and Kupperman score of the group of Kuntai capsule and Climen were lower than Climen only. Conclusion. Available evidence shows that Kuntai capsule with Climen is more effective than Climen in the therapy of premature ovarian failure. Nowadays, the quality of the research studies is low. More large-scaled randomized trials will need to be carried out.