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Background  Circadian (∼24 hr) rhythms are generated by the central pacemaker localized to the suprachiasmatic nucleus (SCN) of the hypothalamus. Although the basis for intrinsic rhythmicity is generally understood to rely on transcription factors encoded by “clock genes”, less is known about the daily regulation of SCN neuronal activity patterns that communicate a circadian time signal to downstream behaviors and physiological systems. Action potentials in the SCN are necessary for the circadian timing of behavior, and individual SCN neurons modulate their spontaneous firing rate (SFR) over the daily cycle, suggesting that the circadian patterning of neuronal activity is necessary for normal behavioral rhythm expression. The BK K +  channel plays an important role in suppressing spontaneous firing at night in SCN neurons. Deletion of the  Kcnma1  gene, encoding the BK channel, causes degradation of circadian behavioral and physiological rhythms.    Methodology/Principal Findings  To test the hypothesis that loss of robust behavioral rhythmicity in  Kcnma1 −/−   mice is due to the disruption of SFR rhythms in the SCN, we used multi-electrode arrays to record extracellular action potentials from acute wild-type (WT) and  Kcnma1 −/−   slices. Patterns of activity in the SCN were tracked simultaneously for up to 3 days, and the phase, period, and synchronization of SFR rhythms were examined. Loss of BK channels increased arrhythmicity but also altered the amplitude and period of rhythmic activity. Unexpectedly,  Kcnma1 −/−   SCNs showed increased variability in the timing of the daily SFR peak.    Conclusions/Significance  These results suggest that BK channels regulate multiple aspects of the circadian patterning of neuronal activity in the SCN. In addition, these data illustrate the characteristics of a disrupted SCN rhythm downstream of clock gene-mediated timekeeping and its relationship to behavioral rhythms.

BK Channels Regulate Spontaneous Action Potential Rhythmicity in the Suprachiasmatic Nucleus