SIRT1 Is a Circadian Deacetylase for Core Clock Components

The transcriptional activator CLOCK is a histone acetyltransferase that is required for the circadian expression of many genes. and now demonstrate that the NAD+-dependent enzyme SIRT1 functions as a histone deacetylase that counteracts the activity of CLOCK. These results broaden our understanding of the impact of cellular metabolism on the circadian system.