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    The astrocyte brain-type fatty acid binding protein (Fabp7) gene expression cycles globally throughout mammalian brain, and is known to regulate sleep in multiple species, including humans. The mechanisms that control circadian Fabp7 gene expression are not completely understood and may include core circadian clock components. Here we examined the circadian expression of Fabp7 mRNA in the hypothalamus of core clock gene Bmal1 knock-out (KO) mice. We observed that the circadian rhythm of Fabp7 mRNA expression is blunted, while overall Fabp7 mRNA levels are significantly higher in Bmal1 KO compared to control (C57BL/6 J) mice. We did not observe any significant changes in levels of hypothalamic mRNA expression of Fabp3 or Fabp5, two other fatty acid binding proteins expressed in mammalian brain, between Bmal1 KO and control mice. These results suggest that Fabp7 gene expression is regulated by circadian processes and may represent a molecular link controlling the circadian timing of sleep with sleep behavior.

    Citation

    Jason R Gerstner, Georgios K Paschos. Circadian expression of Fabp7 mRNA is disrupted in Bmal1 KO mice. Molecular brain. 2020 Feb 24;13(1):26

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    PMID: 32093736

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