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Specific Sequences Outside the E-box Are Required for Proper per Expression and Behavioral Rescue
Lisa C. Lyons
Department of Biology and Biochemistry, University of Houston, Houston, TX 772040-5513, USA
Thomas K. Darlington
Department of Cell Biology and NSF Center for Biological Timing, The Scripps Research Institute, 10550 North Torrey Pines Road, LaJolla, CA 92037, USA
Haiping Hao
Rohm Haas Research Laboratories, 727 Norristown Road, Spring House, PA 19477, USA
Jerry Houl
Department of Biology and Biochemistry, University of Houston, Houston, TX 772040-5513, USA
Steve A. Kay
Department of Cell Biology and NSF Center for Biological Timing, The Scripps Research Institute, 10550 North Torrey Pines Road, LaJolla, CA 92037, USA
Paul E. Hardin
Department of Biology and Biochemistry, University of Houston, Houston, TX 772040-5513, USA
A 69 bp circadian regulatory sequence (CRS) upstream of the per gene is sufficient to drive circadian transcription, mediate proper spatial expression, and rescue behavioral rhythmicity in per01 flies. Within the CRS, an E-box is required for transcriptional activation by two basic-helix-loop-helix (bHLH) PERARNT-SIM (PAS) transcription factors, dCLOCK (dCLK) and CYCLE (CYC). To define sequences within the CRS that are required for spatial expression, circadian expression, and behavioral rhythmicity, a series of mutants that alter blocks of 3 to 12 nucleotides across the entire CRS were used to drive lacZ or per expression in vivo. As expected, the E-box within the CRS is necessary for high-level expression and behavioral rhythmicity, but sequences outside the E-box are also required for transcriptional activation, proper spatial expression, and behavioral rhythmicity. These results indicate that the dCLK-CYC target site extends beyond the E-box and that factors other than dCLK and CYC modulate per transcription.
Key Words: Drosophila period circadian rhythms transcription gene expression behavior
Journal of Biological Rhythms, Vol. 15, No. 6,
472-482 (2000)
DOI: 10.1177/074873040001500604

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