Clock Genes in Glia Cells: A Rhythmic History.
Circadian rhythms are periodic patterns in biological processes that allow the organisms to anticipate changes in the environment. These rhythms are driven by the suprachiasmatic nucleus (SCN), the master circadian clock in vertebrates. At a molecular level, circadian rhythms are regulated by the so-called clock genes, which oscillate in a periodic manner. The protein products of clock genes are transcription factors that control their own and other genes' transcription, collectively known as "clock-controlled genes." Several brain regions other than the SCN express circadian rhythms of clock genes, including the amygdala, the olfactory bulb, the retina, and the cerebellum. Glia cells in these structures are expected to participate in rhythmicity. However, only certain types of glia cells may be called "glial clocks," since they express PER-based circadian oscillators, which depend of the SCN for their synchronization. This contribution summarizes the current information about clock genes in glia cells, their plausible role as oscillators and their medical implications.
Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional, Ciudad de México, México Soluciones para un México Verde, S.A de C.V., Santa Fé Ciudad de México, México.
Donají
D
Chi-Castañeda
Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional, Ciudad de México, México arortega@cinvestav.mx.
Arturo
A
Ortega
circadian rhythms; clock genes; glia cells; oscillators; rhythmicity; suprachiasmatic nucleus
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