Circadian time series RNAseq in mouse primary chondrocytes
In mammals, temporally coordinated daily rhythms of behaviour and physiology are generated by a multi-oscillatory circadian system, entrained through cyclic environmental cues (e.g. light).  Presence of niche-dependent physiological time cues have been proposed to allow local tissues flexibility of adopting a different phase relationship if circumstances require.  Up till now, such tissue-unique stimuli have remained elusive.  Here we show that cycles of mechanical loading and osmotic stimuli within physiological range drive rhythmic expression of clock genes and reset clock phase and amplitude in cartilage and intervertebral disc tissues.