The 'body clock' regulates the daily cycles of many physiological and metabolic processes, but just how is a mystery. New findings suggest that the cycling of energy metabolism is mediated by an activator of gene expression.

MicroRNAs are natural, single-stranded, small RNA molecules thought to control gene expression. Four studies indicate that specific microRNAs sequences can regulate heart function in development and disease.

In bacteria, some messenger RNAs can sense the need for their protein product and accordingly regulate expression of their own genes. A similar type of RNA regulation has now been revealed in higher organisms.