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Circadian clocks are cellular timekeepers that regulate aspects of temporal organization on daily and seasonal time scales. To allow accurate time measurement, the period lengths of clocks are conserved in a range of temperatures—a phenomenon known as temperature compensation. Temperature compensation of circadian clock period aids in maintaining a stable “target time” or phase of clock-controlled events. Here we show that the  Neurospora  protein VIVID (VVD) buffers the circadian system against temperature fluctuations. In  vvd -null mutants, the circadian period of clock-controlled events such as asexual sporulation (conidiation) is temperature compensated, but the phase of this clock time marker is not. Consistent with delayed conidiation at lower temperatures in  vvd  KO  strains, the levels of  vvd  gene products in the wild type increase with decreasing temperatures. Moreover,  vvd  C108A  mutants that lack the light function of VVD maintain a dark activity that transiently influences the phase of conidiation, indicating that VVD influences the time of conidiation downstream from the clock. FREQUENCY (FRQ) phosphorylation is altered in a  vvd  KO  strain, suggesting a mechanism by which VVD can influence the timing of clock-controlled processes in the dark. Thus, temperature compensation of clock-controlled output is a key factor in maintaining temperature compensation of the entire circadian system.

The PAS/LOV protein VIVID controls temperature compensation of circadian clock phase and development in Neurospora crassa