Phenotypic rescue of a peripheral clock genetic defect via SCN hierarchical dominance - PubMed (original) (raw)
Phenotypic rescue of a peripheral clock genetic defect via SCN hierarchical dominance
Matthew P Pando et al. Cell. 2002.
Free article
Abstract
The mammalian circadian system contains both central and peripheral oscillators. To understand the communication pathways between them, we have studied the rhythmic behavior of mouse embryo fibroblasts (MEFs) surgically implanted in mice of different genotypes. MEFs from Per1(-/-) mice have a much shorter period in culture than do tissues in the intact animal. When implanted back into mice, however, the Per1(-/-) MEF take on the rhythmic characteristics of the host. A functioning clock is required for oscillations in the target tissues, as arrhythmic clock(c/c) MEFs remain arrhythmic in implants. These results demonstrate that SCN hierarchical dominance can compensate for severe intrinsic genetic defects in peripheral clocks, but cannot induce rhythmicity in clock-defective tissues.
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