A compartmentalized SCN model explains temperature resistance through interregional phase differences.

A compartmentalized SCN model reveals that intrinsic phase differences between dorsal and ventral regions confer temperature resistance in mammalian circadian rhythms.

• Why it matters: Understanding why the master circadian clock in mammals remains insensitive to temperature changes is crucial for deciphering circadian stability and its regulation, especially since peripheral tissues do entrain to temperature cycles.
• What they did: The study developed a detailed model of the SCN incorporating heat shock protein pathways and simulated responses to temperature variations, successfully reproducing experimental observations of phase shifts in peripheral clocks.
• The result: Findings show that phase heterogeneity within the SCN underpins its temperature resistance, suggesting that spatial structure and regional phase differences are key to maintaining circadian stability against thermal fluctuations.