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Stability of the Synechococcus elongatus PCC 7942 circadian clock under directed anti-phase expression of the kai genes

Jayna L. Ditty^1,

Shannon R. Canales^2,

Stanly B. Williams^2,

¹ Department of Biology, The University of St Thomas, St Paul, MN 55105, USA
² Department of Biology, Texas A&M University, 3258 TAMU, College Station, TX 77843-3258, USA

Correspondence
Susan S. Golden
sgolden{at}tamu.edu

The kaiA, kaiB and kaiC genes encode the core components of the cyanobacterial circadian clock in Synechococcus elongatus PCC 7942. Rhythmic expression patterns of kaiA and of the kaiBC operon normally peak in synchrony. In some mutants the relative timing of peaks (phase relationship) between these transcription units is altered, but circadian rhythms persist robustly. In this study, the importance of the transcriptional timing of kai genes was examined. Expressing either kaiA or kaiBC from a heterologous promoter whose peak expression occurs 12 h out of phase from the norm, and thus 12 h out of phase from the other kai locus, did not affect the time required for one cycle (period) or phase of the circadian rhythm, as measured by bioluminescence reporters. Furthermore, the data confirm that specific cis elements within the promoters of the kai genes are not necessary to sustain clock function.

Present address: Department of Biology, The University of Utah, Salt Lake City, UT 84112, USA.

These authors contributed equally to this work.

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