Molecular origin of the kidney clock

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Molecular origin of the kidney clock Michelle L. Gumz  Kidney International  Volume 86, Issue 5, Pages 873-874 (November 2014) DOI: 10.1038/ki.2014.239 Copyright © 2014 International Society of Nephrology Terms and Conditions

Figure 1 Transcriptional mechanism of the circadian clock. On a basic level, the circadian clock mechanism consists of a transcriptional/translational feedback mechanism. In the positive loop, the circadian rhythm proteins Bmal1 and Clock heterodimerize and interact with E-box response elements in the promoters of target genes. In the negative loop, the products of the Per2 and Cry1/2 target genes feed back on and inhibit the action of Bmal1/Clock, thereby inhibiting their own transcription. As discussed in the study by Mészáros et al.,5 a number of kidney-specific target genes, presumably regulated by the circadian clock mechanism, exhibit oscillations in mRNA expression. *The kidney-specific target genes tested in this study were αENaC (α subunit of the epithelial sodium channel encoded by the Scnn1a gene), SGK1 (serum- and glucocorticoid-regulated kinase 1), NHE3 (sodium/hydrogen exchanger encoded by the Slc9a3 gene), and AVPR2 (vasopressin receptor 2). Not pictured: Rev-erbα (encoded by the Nr1d1 gene), a Bmal1/Clock target gene encoding a nuclear orphan receptor, which in turn mediates negative regulation of Bmal1 gene expression. Kidney International 2014 86, 873-874DOI: (10.1038/ki.2014.239) Copyright © 2014 International Society of Nephrology Terms and Conditions