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      Permanent link:
      https://www.ias.ac.in/article/fulltext/jgen/087/05/0467-0471

    • Keywords

       

      circadian rhythms; entrainment; phase shift; suprachiasmatic nucleus; tau mutation; Syrian hamster; Mesocricetus auratus.

    • Abstract

       

      In mammals, the mechanism for the generation of circadian rhythms and entrainment by light–dark (LD) cycles resides in the hypothalamic suprachiasmatic nuclei (SCN), and the principal signal that adjusts this biological clock with environmental timing is the light:dark cycle. Within the SCN, rhythms are generated by a complex of molecular feedback loops that regulate the transcription of clock genes, including per and cry. Posttranslational modification plays an essential role in the regulation of biological rhythms; in particular, clock gene phosphorylation by casein kinase I, both epsilon (CKI𝜖) and delta (CKI𝛿), regulates key molecular mechanisms in the circadian clock. In this paper, we report for the first time that CKI activity undergoes a significant circadian rhythm in the SCN (peaking at circadian time 12, the start of the subjective night), and its pharmacological inhibition alters photic entrainment of the clock, indicating that CKI may be a key element in this pathway.

    • Author Affiliations

       

      Patricia V. Agostino1 Santiago A. Plano1 Diego A. Golombek1

      1. Laboratorio de Cronobiología, Departamento de Ciencia y Tecnologia, Universidad Nacional de Quilmes / CONICET, Roque Sáenz Peña 352, Bernal (B1876BXD), Buenos Aires, Argentina
    • Dates

       
  • Journal of Genetics | News

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